Answers review of 15. Framing only. Three items reverse a rule 15
introduced, and one retracts a mutation that was not a defect.
**THE PRODUCER RULE CONTRADICTED PROACTIVE CANCELLATION.** The daemon
cancels BEFORE emitting the replacement frame, so the frontend needs
only to clear its local latch when that frame arrives, and send
nothing. Revision 15 asked it to emit a cancellation tail or retain the
latch: the tail is redundant --- the daemon would receive a release for
a gesture it has already settled, which is the duplicate release the
latch exists to prevent --- and RETAINING IS ACTIVELY HARMFUL, because
it manufactures a `Drag` under the NEW generation with no accepted
`Down`. That is the exact orphan the section exists to prevent,
produced by the rule meant to prevent it.
Ordering is what makes the simple rule safe: cancel, then emit. The
frame's arrival IS the cancellation signal; no second channel is
needed. Witnessed as `Down` -> key advances -> replacement frame ->
motion and physical `Up` produce no new drag and no duplicate release.
**THE LATCH HAD ONE TRIGGER AND NEEDED FIVE.** Cancellation runs on
every loss of gesture authority: generation advance, `Absent`, panel or
buffer identity change, geometry-epoch change EVEN AT AN UNCHANGED CELL
TOTAL, and detach. And an ordinary accepted `Up` must clear the latch,
or a later invalidation finds a gesture it believes live and
synthesises a duplicate release for a button already up --- the replay
lane's D1/D2 orphan race, arriving from the daemon's side.
**G9b's MUTATION WAS A VALID IMPLEMENTATION, NOT A DEFECT.** Keying the
dedupe by `(mapping_generation, coord)` preserves same-generation
suppression and naturally admits the first motion under a new
generation. Requiring it to fail would have forbidden a correct design.
Replaced with two real defects: compare only the cell and never key or
reset by generation (the first post-change motion is eaten), and reset
on every same-generation repaint (pixel-rate traffic returns).
**"PROJECTED CELL IDENTITY" CONTRADICTED THE STYLING CONTROL** in the
same section. The wire `Cell` derives `PartialEq` over `glyph`, STYLE
and `attachment` (`pmacs-protocol/src/cell.rs:153`), so an identity
keyed on cell equality moves on a pure recolour --- while the stable
controls rule style out. Terminal identity is now glyph and row
TOPOLOGY plus the view anchor, excluding face, style and cursor, with a
same-glyph/different-style control: the row that catches an
implementation reaching for `Cell` equality because it is right there.
P2s: zero-generation rows added in BOTH directions as independent legs
(a valid `PresentMapped` with generation zero must be rejected
atomically; a zero-generation `PanelPointerMapped` must be refused);
G7 split into outbound mapped-frame and inbound mapped-pointer legs,
since its old mutation only withheld the frame; G2's grid rows/columns
and fold-map-content/`fold_projection`-policy composites split; and
SS20 now names journey steps 5 and 8 while stating neither grade
changes --- an auditor scanning for grade movement alone would
otherwise conclude this slice touches no journey.
**AND R7 RECURRED, ON A DIFF THAT IS ENTIRELY DOCUMENTATION.** The
first `--protocol` run of this tree failed the `gpu` step on
`managed_retry_survives_transients_and_uses_the_successful_stream`,
with all three required fragments verified from the durable log
(`20260815T072601Z`). Recorded as R7's FIFTH occurrence.
It carries the strongest tree exclusion the row has had: occurrences 1
and 4 argued "unrelated lane", while this branch cannot be related at
all --- no Rust, no wire surface, no `pmacs-gpu` file. The line moved
to `attach.rs:1728` from `:1680`, which the row already treats as
occurrence-specific rather than a fragment. Isolated rerun green, and
the full gate green on the re-run (271/271 in the `gpu` step) --- which
per this file's rerun rule establishes INTERMITTENCE ONLY, though here
there is no tree change to exonerate.
What five occurrences across three flavors and five unrelated lanes now
support is that the failure is NOT LANE-CORRELATED. That is evidence
about where the cause is not. The retirement condition is unchanged.
Gates: all eleven green under `env -u TMPDIR` with `--protocol`,
log 20260815T073556Z.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016bqGA6s9tTUFzYpbeW3tai
Levi Neuwirth
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