feat(release): binaries on tag — Distribution Stage 1

.github/workflows/ had exactly one workflow and it was test-only: no
release job, no artifact upload, no tags-to-binaries path. Installing
pmacs meant `git clone` plus knowing the feature-flag matrix.
COHERENCE.md §17 grades this "missing — zero release machinery exists";
this moves it to Partial and completes journey step 1.

Scope is one stage: binaries when a `v*` tag is pushed, attached to a
GitHub Release. Channels, rollback, update-in-place, signing, RHEL 9 and
Intel macOS are out of scope and named in the framing's §5.

WHAT SHIPS: pmacs and pmacs-gpu, both at 1.1.0, CRDT-enabled, co-located
in one archive, with SHA256SUMS. pmacs-protocol stays at 1.0.0 — it is
the wire crate and versions on its own schedule.

THE VERSION BUMP EXPOSED A REAL DEFECT, and it is the reason this PR
touches src/ at all. `InstanceIdentity::for_running_process` is defined
in pmacs-protocol and expanded `env!("CARGO_PKG_VERSION")` THERE. `env!`
expands in the crate being compiled, so the field documented as "Pmacs
version string" carried the PROTOCOL crate's version. That identity
reaches Lua as `pmacs.instance.identity()` and goes on the wire in
`Hello`, so a 1.1.0 release would have told every attached frontend it
was 1.0.0.

Nothing could have caught it earlier. Three tests assert
`id.pmacs_version == env!("CARGO_PKG_VERSION")` evaluated in the pmacs
crate — the correct assertion — but while both crates read 1.0.0 they
compared the same number reached by two different paths and COULD NOT
FAIL. Deciding to hold pmacs-protocol at 1.0.0 while moving pmacs is
what made them discriminating; all three failed on the bump. The version
is now a parameter so `env!` expands in the caller's crate. A test can
be correct and still prove nothing when the two things it compares are
equal for a reason unrelated to the code under test.

TWO LAYERS OF BINARY EXCLUSION, and layer 2 is load-bearing —
demonstrated, not argued. Cargo auto-discovers src/bin/*.rs, so a
release build can produce five binaries and three must never ship
(pmacs-audit is a contributor tool; pmacs_fake_lsp and pmacs_fake_mcp
are test fixtures). Layer 1 names explicit --bin targets. Layer 2 stages
an explicit asset list, and building this branch produced exactly the
case it guards: after building ONLY --bin pmacs and -p pmacs-gpu,
target/release still held all three forbidden binaries, left by an
earlier `cargo test --release`. Swatinem/rust-cache restores that kind
of directory in CI. An implementation trusting layer 1 and archiving the
directory would have published a fake language server in the first
release.

The three archive assertions are bite-verified: a smuggled
pmacs_fake_lsp, a missing pmacs-gpu, and a cleared executable bit are
each caught, with the honest archive passing.

THE GLIBC FLOOR IS ASSERTED, NOT TRUSTED. Pinning ubuntu-22.04 sets the
floor at 2.35 (Ubuntu 22.04, Debian 12 — NOT RHEL 9 at 2.34, which needs
a container or cross-build and is parked). But a pinned runner proves
nothing about the artifact, and the failure surfaces as a bare
`GLIBC_2.39 not found` on a user's machine with no clue which commit
caused it. The build reads versioned-symbol requirements out of the
binary and fails above the floor, so switching to ubuntu-latest fails in
CI instead of shipping. Bite-verified both directions on a glibc 2.44
host. Both runners are pinned; macos-latest would drift the minimum
supported macOS with no commit to point at.

Preflight runs before any build: the tag must match the root crate
version (stripping a prerelease suffix, so v1.1.0-rc.1 and v1.1.0 both
match 1.1.0), and the tagged commit must be an ancestor of main. Both
catch mistakes that are cheap now and expensive once a public URL
exists. The suite is not re-run — CI already tested the commit — but
nothing otherwise enforced that a tag points at a tested one.

Verified: fmt, diff-check, clippy with and without crdt, --lib 1896,
--lib --features crdt 2081, pmacs-protocol 19, m4 149, required GPU 221,
and the full serialized crdt sweep at 3,715 passed / 0 failed / 30
ignored — identical to the pre-change baseline, so the protocol
signature change broke nothing. Archive staging, contents, executable
bits and both --version outputs were exercised against a real release
build locally.

No release is cut by this PR. Per the framing's §7 the RC is tagged
after merge, from the merge SHA.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.github/workflows/release.yml

@@ -0,0 +1,362 @@
+name: Release
+
+# Distribution Stage 1 — binaries on tag. See
+# docs/distribution-stage1-framing.md.
+#
+# Scope is deliberately one stage: build the two shipped binaries when a
+# `v*` tag is pushed and attach them to a GitHub Release. There are no
+# channels, no rollback, no update-in-place, no signing. Those are named
+# as out of scope in the framing's §5 rather than forgotten.
+#
+# Nothing here runs on a branch push or a pull request. A tag is the
+# only trigger, because a release built from anything else would publish
+# artifacts for a commit nobody reviewed as a release.
+on:
+  push:
+    tags:
+      - 'v*'
+
+# A release must never race itself. Two tags pushed close together would
+# otherwise both mutate the same release page.
+concurrency:
+  group: release-${{ github.ref }}
+  cancel-in-progress: false
+
+env:
+  CARGO_TERM_COLOR: always
+
+permissions:
+  contents: write
+
+jobs:
+  # ---------------------------------------------------------------
+  # Preflight runs BEFORE any build, because both of its checks catch
+  # mistakes that are cheap now and expensive once artifacts exist: a
+  # published release is a public URL, and unpublishing one is not the
+  # same as never having published it.
+  # ---------------------------------------------------------------
+  preflight:
+    name: Preflight (tag/version, ancestry)
+    runs-on: ubuntu-22.04
+    timeout-minutes: 10
+    outputs:
+      version: ${{ steps.check.outputs.version }}
+      prerelease: ${{ steps.check.outputs.prerelease }}
+    steps:
+      # Full history: the ancestry check below cannot run on a shallow
+      # clone, and the default checkout depth is 1.
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - id: check
+        name: Tag must match the root crate version, and be on main
+        run: |
+          set -euo pipefail
+          tag="${GITHUB_REF_NAME}"
+
+          # Strip the leading v, then strip any prerelease suffix:
+          # v1.1.0-rc.1 and v1.1.0 must both match a crate version of
+          # 1.1.0. Cargo has no place to record "rc.1", so requiring the
+          # manifest to carry it would make prereleases impossible.
+          version="${tag#v}"
+          base="${version%%-*}"
+
+          # Read the ROOT package version specifically. A grep for
+          # `^version` across the workspace would match whichever
+          # manifest sorted first, and pmacs-protocol deliberately holds
+          # a different number.
+          manifest=$(cargo metadata --no-deps --format-version 1 \
+            | python3 -c 'import json,sys; print(next(p["version"] for p in json.load(sys.stdin)["packages"] if p["name"]=="pmacs"))')
+
+          echo "tag=$tag base=$base manifest=$manifest"
+          if [ "$base" != "$manifest" ]; then
+            echo "::error::tag $tag implies version $base but the pmacs crate is $manifest." \
+                 "Bump Cargo.toml or fix the tag; publishing this would ship a binary whose" \
+                 "--version disagrees with its release."
+            exit 1
+          fi
+
+          # A tag on a branch is the realistic mistake. Re-running the
+          # test suite here would be duplicated cost -- CI already tested
+          # this commit -- but nothing otherwise enforces that the tagged
+          # commit is one CI ever saw on main.
+          if ! git merge-base --is-ancestor "$GITHUB_SHA" origin/main; then
+            echo "::error::tagged commit $GITHUB_SHA is not an ancestor of origin/main." \
+                 "Releases are cut from main."
+            exit 1
+          fi
+
+          # Anything with a suffix (-rc.1, -beta) is a prerelease. The
+          # framing requires the RC to be marked so it cannot be mistaken
+          # for the real thing on the releases page.
+          if [ "$version" = "$base" ]; then
+            echo "prerelease=false" >> "$GITHUB_OUTPUT"
+          else
+            echo "prerelease=true" >> "$GITHUB_OUTPUT"
+          fi
+          echo "version=$version" >> "$GITHUB_OUTPUT"
+
+  # ---------------------------------------------------------------
+  # Both runners are PINNED, never `-latest`. Two different reasons,
+  # both about a silent choice:
+  #
+  #   * ubuntu-22.04 sets the glibc floor at 2.35, which covers Ubuntu
+  #     22.04 and Debian 12. `ubuntu-latest` (24.04, glibc 2.39) would
+  #     silently produce binaries that fail to load on both with a bare
+  #     `GLIBC_2.39 not found`. Note the floor does NOT reach RHEL 9
+  #     (glibc 2.34) -- that needs a container or cross-build and is
+  #     parked in the framing's §5.
+  #
+  #   * macos-15 is arm64. `macos-latest` drifts, so a future runner
+  #     change could move the minimum supported macOS with no commit in
+  #     this repository to point at.
+  # ---------------------------------------------------------------
+  build:
+    name: Build ${{ matrix.target-label }}
+    needs: preflight
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 45
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-22.04
+            target-label: linux-x86_64
+          - os: macos-15
+            target-label: macos-arm64
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+
+      # CRDT is not optional. `run_gpu` refuses outright without it
+      # ("--gpu requires pmacs built with --features crdt"), and
+      # InstanceCapabilities::default advertises multi_frontend /
+      # crdt_replica / semantic_render only under the feature. A
+      # non-CRDT release would ship an editor that cannot use the GPU
+      # frontend shipped beside it.
+      #
+      # EXPLICIT --bin TARGETS, layer 1 of 2. Cargo auto-discovers
+      # src/bin/*.rs, so a plain `--workspace` release build also
+      # produces pmacs-audit, pmacs_fake_lsp and pmacs_fake_mcp -- the
+      # last two being test fixtures. Naming targets keeps them from
+      # being built at all.
+      - name: Build the shipped binaries only
+        run: |
+          set -euo pipefail
+          cargo build --release --bin pmacs --features crdt
+          cargo build --release -p pmacs-gpu
+
+      # EXPLICIT STAGED ASSET LIST, layer 2 of 2. Layer 1 alone is not
+      # enough: a cached target/release can still hold binaries from an
+      # earlier build, and archiving that directory would publish them.
+      # Copying named files into a clean staging dir makes the archive's
+      # contents a decision rather than a directory's residue.
+      #
+      # The two binaries are staged into the SAME directory on purpose.
+      # `pmacs --gpu` prefers a co-located pmacs-gpu and only then falls
+      # back to a PATH lookup, so co-location is what makes an unpacked
+      # release self-contained for someone who unpacks it off PATH.
+      - name: Stage the archive
+        id: stage
+        run: |
+          set -euo pipefail
+          name="pmacs-${{ needs.preflight.outputs.version }}-${{ matrix.target-label }}"
+          mkdir -p "staging/$name"
+          cp target/release/pmacs "staging/$name/"
+          cp target/release/pmacs-gpu "staging/$name/"
+          cp README.md LICENSE* "staging/$name/" 2>/dev/null || true
+          chmod +x "staging/$name/pmacs" "staging/$name/pmacs-gpu"
+          tar -C staging -czf "$name.tar.gz" "$name"
+          echo "archive=$name.tar.gz" >> "$GITHUB_OUTPUT"
+          echo "name=$name" >> "$GITHUB_OUTPUT"
+
+      # Assert the archive rather than the build command. The build
+      # could change, a target could be added, a cache could leak -- the
+      # only thing that decides what users receive is what is inside
+      # this file.
+      - name: Assert archive contents
+        run: |
+          set -euo pipefail
+          archive="${{ steps.stage.outputs.archive }}"
+          name="${{ steps.stage.outputs.name }}"
+
+          members=$(tar -tzf "$archive" | sed "s#^$name/##" | grep -v '^$' | sort)
+          echo "members:"; echo "$members" | sed 's/^/  /'
+
+          for forbidden in pmacs-audit pmacs_fake_lsp pmacs_fake_mcp; do
+            if echo "$members" | grep -qx "$forbidden"; then
+              echo "::error::$forbidden is present in $archive and must never ship"
+              exit 1
+            fi
+          done
+
+          for required in pmacs pmacs-gpu; do
+            echo "$members" | grep -qx "$required" \
+              || { echo "::error::$required missing from $archive"; exit 1; }
+          done
+
+          # Executable bits, read back out of the archive itself.
+          for required in pmacs pmacs-gpu; do
+            mode=$(tar -tvzf "$archive" | awk -v f="$name/$required" '$NF==f {print $1}')
+            case "$mode" in
+              *x*) : ;;
+              *) echo "::error::$required is not executable in the archive (mode $mode)"; exit 1 ;;
+            esac
+          done
+
+      # Run the staged binaries. `--version` is the cheapest end-to-end
+      # proof that what was built is what will ship, and it is the check
+      # that would have caught a tag/manifest mismatch reaching this far.
+      - name: Assert the staged binaries report the tagged version
+        run: |
+          set -euo pipefail
+          expected="${{ needs.preflight.outputs.version }}"
+          base="${expected%%-*}"
+          name="${{ steps.stage.outputs.name }}"
+
+          got_pmacs=$("staging/$name/pmacs" --version)
+          got_gpu=$("staging/$name/pmacs-gpu" --version)
+          echo "pmacs:     $got_pmacs"
+          echo "pmacs-gpu: $got_gpu"
+
+          echo "$got_pmacs" | grep -qx "pmacs $base" \
+            || { echo "::error::pmacs --version reported '$got_pmacs', expected 'pmacs $base'"; exit 1; }
+          echo "$got_gpu" | grep -q "^pmacs-gpu $base " \
+            || { echo "::error::pmacs-gpu --version reported '$got_gpu', expected 'pmacs-gpu $base ...'"; exit 1; }
+
+      # The glibc floor, MACHINE-CHECKED rather than trusted.
+      #
+      # Pinning ubuntu-22.04 is what sets the floor, but nothing about a
+      # pinned runner *proves* the resulting binary honours it, and the
+      # failure is invisible at build time -- it surfaces as a bare
+      # `GLIBC_2.xx not found` on a user's machine, with no clue which
+      # commit caused it. Reading the required symbol versions out of
+      # the binary turns a runner choice into an assertion, so switching
+      # this job to `ubuntu-latest` fails HERE instead of shipping.
+      #
+      # Linux only: Mach-O has no equivalent versioned-symbol scheme.
+      - name: Assert the glibc floor
+        if: runner.os == 'Linux'
+        run: |
+          set -euo pipefail
+          floor="2.35"   # Ubuntu 22.04 / Debian 12; see the framing §1.6
+          name="${{ steps.stage.outputs.name }}"
+          fail=0
+          for bin in pmacs pmacs-gpu; do
+            max=$(objdump -T "staging/$name/$bin" \
+                  | grep -oE 'GLIBC_[0-9]+\.[0-9]+' \
+                  | sed 's/GLIBC_//' | sort -uV | tail -1)
+            echo "$bin requires at most glibc $max (floor $floor)"
+            highest=$(printf '%s\n%s\n' "$floor" "$max" | sort -V | tail -1)
+            if [ "$highest" != "$floor" ]; then
+              echo "::error::$bin requires glibc $max, above the declared floor $floor." \
+                   "It will not load on Ubuntu 22.04 or Debian 12. Check the runner image."
+              fail=1
+            fi
+          done
+          [ "$fail" -eq 0 ]
+
+      - name: Checksum
+        run: |
+          set -euo pipefail
+          archive="${{ steps.stage.outputs.archive }}"
+          if command -v sha256sum >/dev/null; then
+            sha256sum "$archive" > "$archive.sha256"
+          else
+            shasum -a 256 "$archive" > "$archive.sha256"
+          fi
+          cat "$archive.sha256"
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: ${{ steps.stage.outputs.name }}
+          path: |
+            ${{ steps.stage.outputs.archive }}
+            ${{ steps.stage.outputs.archive }}.sha256
+          if-no-files-found: error
+
+  publish:
+    name: Publish release
+    needs: [preflight, build]
+    runs-on: ubuntu-22.04
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/download-artifact@v4
+        with:
+          path: dist
+          merge-multiple: true
+
+      # One SHA256SUMS covering every published artifact, alongside the
+      # per-archive files. Without it a download cannot be verified by
+      # anyone; with it, verification is one command.
+      - name: Collect checksums
+        run: |
+          set -euo pipefail
+          cd dist
+          ls -la
+          cat ./*.sha256 | sed 's#\./##' | sort -k2 > SHA256SUMS
+          echo "--- SHA256SUMS ---"; cat SHA256SUMS
+          sha256sum -c SHA256SUMS
+
+      - name: Release notes
+        run: |
+          set -euo pipefail
+          cat > notes.md <<'NOTES'
+          ## Install
+
+          Download the archive for your platform, unpack it, and put both
+          binaries somewhere on your `PATH` — **keep them together**:
+          `pmacs --gpu` looks for `pmacs-gpu` beside itself first, then
+          falls back to `PATH`.
+
+          Verify a download against `SHA256SUMS`:
+
+          ```sh
+          sha256sum -c SHA256SUMS --ignore-missing
+          ```
+
+          ## Platform support
+
+          - **Linux x86_64** — built on Ubuntu 22.04, so the floor is
+            **glibc ≥ 2.35**. Covers Ubuntu 22.04+ and Debian 12+.
+            **RHEL 9 (glibc 2.34) is below the floor and not supported
+            yet.**
+          - **macOS arm64 (Apple Silicon)** — Intel macOS is not built
+            yet. The binaries are **unsigned and not notarized**, so
+            Gatekeeper will quarantine them; you will need to allow them
+            explicitly.
+
+          ## Runtime dependencies
+
+          Not checked at startup — the editor assumes them:
+          `/bin/sh`, `stty` and coreutils (PTY raw-mode trampoline, used
+          by the REPL and terminal), plus `git` and `tar` for package
+          installation. The Lua VM is statically vendored, so there is no
+          external Lua dependency.
+
+          `pmacs-gpu` additionally needs a working Vulkan (Linux) or
+          Metal (macOS) adapter. There is no software-rasterizer
+          fallback in a shipped binary.
+
+          ## Not in this release
+
+          Channels, in-place update, rollback, signing, reproducible
+          builds, package-manager distribution, and Windows. See
+          `docs/distribution-stage1-framing.md` §5.
+          NOTES
+          echo "notes written"
+
+      - name: Publish
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          set -euo pipefail
+          flags=(--title "pmacs ${{ needs.preflight.outputs.version }}" --notes-file notes.md)
+          if [ "${{ needs.preflight.outputs.prerelease }}" = "true" ]; then
+            flags+=(--prerelease)
+          fi
+          gh release create "${GITHUB_REF_NAME}" "${flags[@]}" \
+            dist/*.tar.gz dist/SHA256SUMS

Cargo.lock

@@ -2568,7 +2568,7 @@ checksum = "b4596b6d070b27117e987119b4dac604f3c58cfb0b191112e24771b2faeac1a6"
 
 [[package]]
 name = "pmacs"
-version = "1.0.0"
+version = "1.1.0"
 dependencies = [
  "arborium-lean",
  "codebook-tree-sitter-latex",
@@ -2621,7 +2621,7 @@ dependencies = [
 
 [[package]]
 name = "pmacs-gpu"
-version = "0.0.1"
+version = "1.1.0"
 dependencies = [
  "arboard",
  "env_logger",

Cargo.toml

@@ -21,7 +21,7 @@ unicode-width = "0.2"
 [package]
 name = "pmacs"
 default-run = "pmacs"
-version = "1.0.0"
+version = "1.1.0"
 edition = "2024"
 rust-version = "1.95"
 description = "Parallel Emacs --- a Rust-cored, Lua-scripted editor in the Emacs tradition"

README.md

@@ -141,6 +141,33 @@ loaded after the builtin runtime so plain assignments override
 defaults --- keybindings, `pmacs.lsp.config`, theme overrides, and
 package installs all live there.
 
+## Install
+
+Download an archive from the
+[releases page](https://github.com/levineuwirth/pmacs/releases), unpack
+it, and put both binaries somewhere on your `PATH`.
+
+**Keep `pmacs` and `pmacs-gpu` together.** `pmacs --gpu` looks for
+`pmacs-gpu` beside itself first and only then falls back to a `PATH`
+lookup, so an unpacked release is self-contained as long as the two
+stay in the same directory.
+
+Verify a download:
+
+```sh
+sha256sum -c SHA256SUMS --ignore-missing
+```
+
+| platform | built on | notes |
+|---|---|---|
+| Linux x86_64 | Ubuntu 22.04 | requires **glibc ≥ 2.35** — Ubuntu 22.04+, Debian 12+. **RHEL 9 (glibc 2.34) is not supported yet.** |
+| macOS arm64 | macOS 15 | Apple Silicon only; Intel is not built yet. Binaries are **unsigned and not notarized**, so Gatekeeper will quarantine them until you allow them explicitly. |
+
+Releases carry binaries only — there is no in-place update, rollback, or
+package-manager distribution yet. Build from source for any platform not
+listed, and see "Runtime dependencies" below for what the editor assumes
+is present.
+
 ## Build
 
 Builds on the toolchain pinned in `rust-toolchain.toml` (Rust

docs/distribution-stage1-framing.md

@@ -1,7 +1,25 @@
 # Framing — Distribution Stage 1: binaries on tag
 
-**Revision 2.** Status: **approved with amendments** (revision 1 →
+**Revision 3.** Status: **implemented** on branch `distribution-stage1`,
-2 records them). Scouted against `githubsucks/main` @ `c5f7501` (#209).
+based on `githubsucks/main` @ `4984169` (#210). Approved at revision 2.
+
+**Revision 2 → 3** records two implementation findings, not a new design
+round:
+
+- **Layer 2 of the binary exclusion is load-bearing, and this is now
+  demonstrated rather than argued** (§1.2b). The argument for it was
+  hypothetical; building the branch produced the exact case it guards
+  against, on the first try.
+- **The glibc floor is machine-checked** (§1.6a), which is stronger than
+  acceptance 7's original container test and runs on every release
+  instead of once at RC time.
+- **The version bump exposed a real product defect** (§1.3a): the daemon
+  reported the *protocol* crate's version to every attached frontend
+  under a field named `pmacs_version`. It was invisible while the two
+  crates happened to share a number, and Q#D1's decision to diverge them
+  is what surfaced it. Fixed here, because shipping a release whose
+  daemon misreports its own version is precisely what this stage
+  exists to prevent.
 
 `.github/workflows/` contains exactly one workflow and it is test-only.
 **There is no release job, no artifact upload, no tags-to-binaries path.**
@@ -94,6 +112,60 @@ layer 1 relies on a list nobody re-checks when a new `src/bin/*.rs`
 appears. Acceptance 2 asserts the **complete member list**, the
 **executable bits**, and the **absence of all three** excluded binaries.
 
+### 1.2b Layer 2 is load-bearing — demonstrated, not argued
+
+Revision 2 justified the second layer with a hypothetical: "a cached
+`target/release` can still hold binaries from an earlier build."
+**Implementing the branch produced that case immediately.** After
+running only
+
+```sh
+cargo build --release --bin pmacs --features crdt
+cargo build --release -p pmacs-gpu
+```
+
+on a tree where earlier work had run `cargo test --release` for the M10
+perf gates, `target/release` contained:
+
+```
+pmacs  pmacs-audit  pmacs_fake_lsp  pmacs_fake_mcp  pmacs-gpu
+```
+
+**All three forbidden binaries were present**, left by the earlier test
+build, despite this build naming only two targets. `Swatinem/rust-cache`
+restores exactly this kind of directory in CI, so the risk is not
+theoretical there either.
+
+An implementation that took layer 1 as sufficient and archived
+`target/release` would have published a fake language server in the
+first release. The three archive assertions are bite-verified: a
+smuggled `pmacs_fake_lsp`, a missing `pmacs-gpu`, and a cleared
+executable bit are each caught, with the honest archive passing.
+
+### 1.6a The glibc floor is asserted, not trusted
+
+Acceptance 7 originally proposed verifying the floor by running the
+binary in containers. **The shipped check is stronger and cheaper**:
+read the versioned-symbol requirements straight out of the binary and
+fail the build when any exceeds the floor.
+
+```sh
+objdump -T <binary> | grep -oE 'GLIBC_[0-9]+\.[0-9]+' | sort -uV | tail -1
+```
+
+Why this beats the container test: it runs on **every** release rather
+than once at RC time, it needs no network or images, and it fails at the
+point of causation. Pinning `ubuntu-22.04` sets the floor but proves
+nothing about the artifact — switching the job to `ubuntu-latest` would
+otherwise ship binaries that fail to load with a bare `GLIBC_2.39 not
+found` on a user's machine, with no clue which commit caused it. With
+the assertion, that change fails in CI instead.
+
+Bite-verified in both directions on a glibc 2.44 host, which stands in
+for a mis-pinned runner: against a 2.35 floor both binaries are caught;
+against a 2.44 floor both pass. Linux only — Mach-O has no equivalent
+versioned-symbol scheme.
+
 ### 1.2a Why `pmacs` and `pmacs-gpu` must be co-located — corrected
 
 Revision 1 said separating them makes `--gpu` "silently fail." **That is
@@ -131,6 +203,36 @@ containing a `pmacs` reporting `1.0.0` and a `pmacs-gpu` reporting
 `0.0.1`. **The workflow must refuse rather than publish** (acceptance
 4), and acceptance asserts the *binaries'* output, not the manifests.
 
+### 1.3a The bump exposed a defect: the daemon reported the wrong crate's version
+
+**`InstanceIdentity::for_running_process` is defined in
+`pmacs-protocol` and expanded `env!("CARGO_PKG_VERSION")` there.**
+`env!` expands in the crate being *compiled*, so the field documented as
+"Pmacs version string" carried the **protocol crate's** version.
+
+This is not cosmetic. That identity reaches Lua as
+`pmacs.instance.identity()` and goes on the wire in `Hello`, so every
+attached frontend was told the daemon's version — and after the bump it
+would have been told `1.0.0` by a `1.1.0` release.
+
+**Nothing could have detected it before this stage.** Three tests assert
+`id.pmacs_version == env!("CARGO_PKG_VERSION")` evaluated in the `pmacs`
+crate, which is the correct assertion — but while both crates read
+`1.0.0` they compared the same number reached by two different paths and
+**could not fail**. Q#D1's decision to hold `pmacs-protocol` at 1.0.0
+while moving `pmacs` is what made them discriminating, and all three
+failed immediately on the bump.
+
+The fix makes the version a **parameter**, so the `env!` expands in the
+caller's crate; all three call sites are in `pmacs` and pass their own.
+This is a breaking signature change to a `pub` function in
+`pmacs-protocol`, which stays at 1.0.0 per Q#D1 — acceptable because the
+crate is a path dependency with no external consumers, and recorded here
+rather than silently absorbed.
+
+*A test can be correct and still prove nothing, when the two things it
+compares are equal for a reason unrelated to the code under test.*
+
 ### 1.4 The existing `v1.0.0` tag is stale and is not re-used
 
 `v1.0.0` is pushed and points at `d3fa632` — the old release mirror's
@@ -257,8 +359,10 @@ change the minimum supported macOS without a commit to point at.
 5. The tagged commit is an ancestor of `main`.
 6. Each artifact is a **CRDT build**, verified by running the shipped
    binary rather than trusting the flag (§1.5).
-7. The Linux binary **runs on Ubuntu 22.04 and Debian 12** — verified in
+7. The Linux binary honours the **glibc ≥ 2.35** floor, asserted from
-   containers — and its glibc floor is stated in the release notes.
+   the binary's own versioned symbols on every release (§1.6a) rather
+   than by a one-off container run, and the floor is stated in the
+   release notes and README.
 8. `SHA256SUMS` covers every published artifact and verifies against the
    downloads.
 9. Release notes carry the runtime dependencies (§1.7), the glibc floor,

pmacs-gpu/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "pmacs-gpu"
-version = "0.0.1"
+version = "1.1.0"
 edition = "2024"
 rust-version = "1.95"
 description = "GPU/GUI frontend for pmacs — attach, editing, syntax/diagnostics/minimap, mouse + context menu, clipboard, search, minibuffer. See docs/pmacs-gpu-design.md."

pmacs-protocol/src/message.rs

@@ -1885,13 +1885,30 @@ impl InstanceIdentity {
     /// call site, so calling twice on different days surfaces different
     /// uptimes from the same anchor.
     ///
-    /// The version comes from `CARGO_PKG_VERSION` and the build hash
+    /// `pmacs_version` is supplied BY THE CALLER, and must be
-    /// from the optional `PMACS_GIT_HASH` environment variable populated
+    /// `env!("CARGO_PKG_VERSION")` evaluated in the `pmacs` crate.
-    /// by the build script.
+    ///
+    /// It is a parameter rather than an `env!` here because `env!`
+    /// expands in the crate being COMPILED: reading it inside
+    /// `pmacs-protocol` yields the *protocol* crate's version, which
+    /// this field is not. The two crates held the same number until the
+    /// 1.1.0 release bump moved `pmacs` and left `pmacs-protocol` at
+    /// 1.0.0 — at which point the daemon began reporting the protocol
+    /// crate's version to every attached frontend, under a field named
+    /// `pmacs_version`. Nothing detected it earlier because the values
+    /// had always agreed by coincidence.
+    ///
+    /// The build hash still comes from the optional `PMACS_GIT_HASH`
+    /// environment variable populated by the build script; that one is
+    /// genuinely crate-independent.
     #[must_use]
-    pub fn for_running_process(instance_name: Option<String>, started: std::time::Instant) -> Self {
+    pub fn for_running_process(
+        pmacs_version: &str,
+        instance_name: Option<String>,
+        started: std::time::Instant,
+    ) -> Self {
         Self {
-            pmacs_version: env!("CARGO_PKG_VERSION").into(),
+            pmacs_version: pmacs_version.into(),
             build_hash: option_env!("PMACS_GIT_HASH").map(String::from),
             instance_name,
             uptime_secs: started.elapsed().as_secs(),

src/attach.rs

@@ -2393,6 +2393,7 @@ mod tests {
                 protocol_version: PROTOCOL_VERSION + 999,
                 assigned_frontend_id: FrontendId::LOCAL,
                 instance_identity: InstanceIdentity::for_running_process(
+                    env!("CARGO_PKG_VERSION"),
                     None,
                     std::time::Instant::now(),
                 ),

src/daemon.rs

@@ -422,7 +422,11 @@ impl DaemonState {
     }
 
     fn build_identity(&self) -> InstanceIdentity {
-        InstanceIdentity::for_running_process(self.instance_name.clone(), self.started)
+        InstanceIdentity::for_running_process(
+            env!("CARGO_PKG_VERSION"),
+            self.instance_name.clone(),
+            self.started,
+        )
     }
 
     /// `--socket NAME` value the daemon was launched with, or `None`

src/lua_bindings/mod.rs

@@ -395,7 +395,11 @@ impl LocalInstanceInfo {
     #[must_use]
     pub fn build_identity(&self) -> InstanceIdentity {
         let data = self.0.borrow();
-        InstanceIdentity::for_running_process(data.name.clone(), data.started)
+        InstanceIdentity::for_running_process(
+            env!("CARGO_PKG_VERSION"),
+            data.name.clone(),
+            data.started,
+        )
     }
 }