T12 log — phase-close docs (Phase 3.39)

Start HEAD aa334295a8. Read card slice, plan Context/Interfaces/Cookbook/Research, T12 entry, Changes; summaries T1-T11.
Located the habit: story §10 + §11 Gen3 row (docs/story.md), retrospective §7 (docs/retrospective.md), wiki page docs/wiki/Where-the-project-goes-next.md gap table + rules, docs/wiki/Docs-and-scratch-conventions.md:17 (the R121 duty row); P38 close commit 3752a7cea5/7eac53da51 pattern. decision-log has no P38 entry; not extended (story/retrospective carry it).
Pre-check: timeline --check fresh (82 rows); readability_progress --check STALE (last row 3a9377c92 vs HEAD aa334295a). progress.py --help has no help: it runs and rewrote docs/progress.md (harness gotcha).
Wrote facts file .run/t12_facts.md (synthesis of T1-T11 summaries, hindsight list) as coder input.
Coder T12.c1 (opus55): five doc edits, commit 20faec8d40; D1 chain (type_census -j16 --out-dir .run/P39/census → 336,225 sites, 11 lying/3 callees; readability_progress --snapshot "P3.39 T12: phase-close docs"; timeline.py 82 rows; progress.py --readme, README block unchanged); timeline --check fresh + readability_progress --check OK at 20faec8d4 before commit 2; tools/doc_links.py OK; commit 89f52cd82a. Log: logs/T12.c1.md.
Expert re-check after commit 2: timeline --check fresh (82 rows); readability_progress --check STALE (row at 20faec8d4, HEAD 89f52cd82): the known self-referential staleness (T9/T11 gotcha), verify green was recorded before the commit.
Retrievers: none. Research: none.