docs(render): S3 chunk 1 fix round 1 — vacuous flag-off pin, LC/SC work outside the flag, flag-on round trip

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

docs/research/2026-09-01-overhaul/s3-walk-ownership-map.md

@@ -803,6 +803,55 @@ DELETE (no retail counterpart):
   poses (InstalledDat lane); the two cathedral `LC`/`SC` order pins.
 - T4: `LaunchOptionsDocumentationTests` green with the one new row.
 
+### 11.5 Chunk 1 fix round 1 (lead, 2026-09-03, after the three-lens review of `079483bb6`)
+
+Verdicts: build/test FAIL and production-path FAIL on the SAME blocking
+finding; retail lens pending at draft time (amended below if it adds
+items). Every item lead-verified against the source. Fix in the same
+worktree on top of `079483bb6`; round 1 of the two the plan allows.
+
+- **G1 — the flag-off integration test is vacuous (blocking).**
+  `Collect_TranscriptFlagOff_ProducesNoConsoleOutput` drives ONE frame and
+  asserts through `WalkOracleTrace.Parse`, which structurally discards the
+  last (open) frame — so a one-frame transcript parses to nothing whether or
+  not anything printed. Fix: drive TWO frames and assert (a) the parser sees
+  ZERO frames and (b) no captured line starts with any of the ten kinds
+  (`F `, `P `, `LS`, `LC `, `SC `, `BLD `, `DI `, `DC `, `EC `, `OC `) —
+  robust to other test classes' console noise, which never begins with those
+  tokens. MUTATION CHECK (mandatory for every pin in this round): show, in
+  the commit message, that the pin FAILS when the flag gate is forced true
+  (temporarily) — a pin that cannot fail is not a pin.
+- **G2 — LC/SC compute before the flag (major).** `LodCellId(...)` runs on
+  every land-cell turn (~1,300 divisions/modulos/checked conversions per
+  outdoor frame) before `PrintLandCell`/`PrintSortCell` test the flag.
+  Guard the call sites: `if (RenderingDiagnostics.DumpWalkTranscriptEnabled)
+  WalkTranscriptDump.PrintLandCell(WalkTranscriptDump.LodCellId(...))`, and
+  audit every other print site for argument work outside the guard (the DC
+  site builds nothing until inside `PrintDrawCells` — fine; the frame-root
+  site is already guarded).
+- **G3 — the flag-on round trip never prints LC/SC/BLD (major).** Extend T2:
+  one outdoor-root frame over a synthetic landscape with one in-view block
+  and one building (the `WalkFrameDriverTests` landscape fixtures already
+  exist) → the captured lines parse to a frame whose events contain
+  `LS`, ≥1 `LC`, ≥1 `SC`, and the `BLD`, in that order, matching the
+  driver's recorded turns; plus one interior-root frame covering `DI`/`DC`/
+  `EC`/`OC`. Both with the mutation check.
+- **G4 — parts/alpha-depth smoke pins (minor).** Assert `AM > 0` and
+  `PM > 0` (and `PD > 0`, `DM > 0` for the parts logs) for every committed
+  capture — §6b lists the counts; a regex that silently matches nothing must
+  fail.
+- **G5 — launch-options wording (minor).** The side-effects column says
+  exactly: flag off = one bool read per print site, nothing else; flag on =
+  one console line per walk turn (≈600–800 lines per outdoor frame) — a
+  print-only diagnostic for offline diffing, never for ordinary runs.
+- **G6 — comment hygiene (note).** Remove the self-correction noise in the
+  conformance test comment ("DI f4180108... no, a9b4013f"); keep the two
+  bespoke Facts (doorway-still, foundry-deep) — they need the full
+  DAT-built world the theory body already uses, so either shape is
+  acceptable; say why in a one-line comment.
+- Gates unchanged (§11.3); the InstalledDat lane must still show only the
+  three known failures; the new still-fixture rows must still reproduce.
+
 ### 11.4 Out of scope
 
 Any validator, canonical format, or dashboard; any behavior change; any