TASK_PROGRESS — T4 attempt 2

Task: T4 rung S sweep, md_*, main and shared bodies (forms P and X) Attempt: 2 Agent: expert-opus55 Commit before this: fd8c632c9b (archived progress1)

Done so far

Archived attempt-1 progress → logs/T4.progress1.md (fd8c632c9b).
Read plan Context/Interfaces/Cookbook/Research, T4 entry, T1-T3 summaries.
Briefed coder T4.c2 (coder-opus55, background) with all remaining c1 steps: wait for live md cycle (pid 1360696, label t4_md_, log .run/P37/restruct/cycle_t4_md.log) → main cycle (label t4_main_, --only main) → shared plan + HEADERS=1 cycle(s) t4_sh_ (+ t4_shc_ for shared .c) → --residue per scope (labels t4_res_) → --check-residue 0 for md_, main, src/shared/, ov_* → type_census refresh, --check-structs, --check-casts line → final clean R22 (.run/logs/t4_final_r22.log) → log phase-ends/current/logs/T4.c2.md.

In flight

T4.c2 coder running at forced hand-back (its report will be lost). It waits on md cycle via tail --pid, then launches further detached cycles itself.

Hypotheses rejected

(from attempt 1) --only "src/*.c" over-matches; gate_main.py is a slate tool, not rung S's gate (c2 told to record whether it applies).

Current hypothesis

Mechanical sweep as T3; done-when met T3-style; fleet-wide "P/X raw = 0 except T5-owned" cannot hold literally (TYPE-NOT-CANONICAL residue) → deviation, verify rc 1 expected for check-casts.

Next 5 steps

Archive this file → logs/T4.progress2.md, commit.
git log --oneline -20 | grep T4; pgrep -af '^bash tools/restruct_cycl[e].sh'; check for phase-ends/current/logs/T4.c2.md (grep/tail). If a cycle is live, wait on it with tail --pid=<pid> -f /dev/null in background; never launch a second.
When cycles are done and c2's log/commits show the remaining steps unfinished, brief T4.c3 naming c2's commits/log for the remainder only.
Verify: PY tools/type_census.py --check-casts --quiet then bash tools/run.sh t4_verify -- bash -c 'make clean && make extract-all JOBS=16 && make check-all JOBS=16'.
Write logs/T4.md, tasks/T4.md (deviations: fleet-wide clause; main gate), task_log.py finish T4, commit.

Gotchas

harness: forced hand-back while coder runs, twice now; coder reports lost — verify from git and logs.
harness: reading .claude/skills via cat is hook-denied; use Read.
.run/P37/restruct/ledger.jsonl needs git add -f.

State to carry verbatim

Baselines (P/X sites at T3 close): ov 251,830 · shared/ov 11,428 · md 9,047 · top-level main 1,755 · resident 78 · shared/slot_* 23.
check-casts at T3 close: raw P=260372 I=51514 X=13790 M=15130; unbacked 0; lying 229.

Coder runs so far

c1 (95612c3097) gone; c2 running at handoff — logs/T4.c2.md

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