Stage-5 grounding audit: session bookend (GA-R4) + ledger rotation ...

Close bookend for the autonomous Stage-5 grounding audit. Bounded ledger
summary (9 bullets, cap 15); full body archived in the same commit as
docs/archive/changelogs/changelog-20260727-stage5-grounding-audit.md, the ONE
changelog for this session per GA-R2/D1, carrying a per-item revert.

Ledger rotation: the bookend pushed the live ledger to 305 lines against the
300-line cap, so the oldest remaining live summary (2026-07-24, caveman
guardrails + DC1 proxy-build start) moved VERBATIM to
docs/archive/session-ledger-rotated-20260727.md as a clearly-labelled second
rotation pass. Live ledger now 289 lines. Sessions from 2026-07-25 remain live.

Reconciled against repo ground truth at close: ledger-scan reports 21 open SEC
rows and next-free D 138 / DOCFIX 205 / BUNDLEFIX 053 -- all UNCHANGED, which
is correct: this session assigned no number because it remediated nothing. The
machine-derived block needed no re-seed.

The changelog records, prominently, that a SESSION-SCOPED PERMISSION BLOCK is
live in the gitignored .claude/settings.local.json and must be removed at
close; the scope doc's section 6 is its only durable record.

Revert: git revert this commit; then restore the 2026-07-24 summary from the
rotation archive if the ledger rotation is also being undone.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HvCyrwvYTTcDYnRErfMsNf