docs(PRD-478): restore walking and visual acceptance checks

[jonit-dev]

PRD-478's walking and visual acceptance remain open: the archived candidate-only timing and pre-clamp pictures do not establish the final comparison contract. Records the owner's October 9 aerial-shadow approval, keeps the PRD in open-world at prd:75%, and replaces stale queued-job instructions with current blockers.

The original capture exited 1. A fresh map-walk retry exited 2 with the same canvas-element stability timeout; both artifact sets are preserved, including ~/offload/out/prd478-finalclamp-resume/map-walk. Four map-view pictures exist; map-walk and pop captures are incomplete. A synthetic paused-clock screenshot passes, so the root cause remains unproven.

Saved bundle and asset-manifest hashes match, but no source record establishes the combined PRD-473 automatic-impostor runtime (#505) and final PRD-541 clamp. Pictures cannot establish final acceptance until that source is pinned. This session runs on Intel Iris Xe; desktop RTX2080 access is needed for timing. No active PRD-473/478/541 capture process was found here; remote lease state is unverified.

Remaining:

• Pin the combined runtime source and diagnose the actual map-walk screenshot failure.
• Complete all eight poses and the pop series, then obtain three fresh blind ratings and the pop verdict.
• Run three quiet RTX2080 map-walk comparisons interleaved with develop a602467db.

Validation on 48f7404f0: 246/246 required prose-contract tests passed, 3,087 documentation links checked, and git diff --check passed. Corepack's pinned pnpm was used for the test environment. No new visual or timing pass is claimed.

The normal pre-push hook selected prose with no product gates, then demanded missing packages/assets/dist. Its documented TN_SKIP_PREPUSH=1 flag was used after the prose checks passed.

A subsequent diagnostic reproduced the timeout but collected no telemetry: its enable flag was overwritten with the output path. That attempt is invalid for diagnosis. The runner was restored byte-for-byte (SHA-256 4061e1607d98d87dca732f49f869463513f55d37939cdb909ae5a4b0db5bb83e), verified against its backup. Equivalent retries are stopped; validate the diagnostic flag/path and emitted telemetry before another actual-map capture. The unresolved assumption is that frames advance while the canvas locator waits for stability.