spec/HANDOFF_2026-08-07.md: state of the spec / Pass-13 / format-epoch
thread at be244df, the live constraint that no bundle may carry a
canonical base until P13-S27 lands, the S28 -> S27 -> S16 chain with
S27's three inherited obligations, the working agreements that are not
derivable from the code, and the environment notes the other machine
needs (xelatex not pdflatex, the 1.95.0/1.85 toolchain pins, the
cargo fmt --all trap and why its --check form is safe).
Section 2 covers the parallel editor/T4 thread and is explicitly
bounded: those files were out of bounds for this session all along, so
it records only what shared git history shows plus leads to verify, and
says plainly that it is not a substitute for that session's own handoff.
It does name the one place the threads can collide — the canonical-base
interval — which neither side can see from its own side.
Ledger: P13-S27 and P13-S28 both still opened with "open" while their
resolutions sat further down the cell. S27 is UNBLOCKED and
dispatchable; S28 is IMPLEMENTED. The cells are appended to rather than
rewritten, so an opener can lag the truth by several rungs; the handoff
records that as a reading hazard.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QjsEnYhm1gPpf6ii2iFxFV
Levi Neuwirth
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