Stage-5 grounding audit: post-review corrections + dc1 egress MEASURED ...

Three fixes from a final review pass, one of which is a new measurement.

MEASUREMENT -- dc1 edge egress is OPEN, probed rather than assumed. Lens 5 had
correctly listed this as UNMEASURED (it rested on a record). Probed directly
from the dc1 rack with --noproxy so an apt-cacher hit could not fake it:
streams.canonical.com/juju/tools/ -> 200 (the agent stream bootstrap actually
needs), api.snapcraft.io reachable, archive.ubuntu.com -> 200, ping 1.1.1.1 0%
loss, default route via 10.12.64.1. So Phase 5.2 stays a standing caveat rather
than becoming a blocker -- but it is now measured, and the row says to re-probe
immediately before bootstrap because the measurement has a shelf life.

DELIVERABLE CORRECTIONS:
- The readiness doc said "Eleven decisions are yours", which reads as the total.
  It is 11 blocking (R1-R11) plus 4 standing (R12-R15) = 15, now stated as such,
  with the GA-R5 one-at-a-time rule restated at the point of use.
- Phase 3's intro still said the runbook fails "in at least five distinct ways"
  from before lens 5 added ten more rows. Corrected to 21 listed corrections and
  nine independent failure paths, with the rows named.
- R9 and R11 are NOT independent of R2 and were presented as if they were. Both
  now carry an explicit "ANSWER R2 FIRST" dependency, matching R8. R2 decides
  what the VIP literals ARE; R9 only asks where they live, and R11's VIPs are
  single- or dual-family depending on it. Under dual-stack, the L3-9 overlay
  collision must be solved BEFORE either authority is populated.

Also recorded for future sessions: there is no Bash(timeout *) allow rule, which
is why lens 1's `timeout 240 bash scripts/preflight.sh` was denied while the bare
command is allowed -- a failed-to-MATCH, same class as the 2026-07-26 quoted-sudo
finding, not a classifier override.

Revert: git revert this commit; all changes are to audit artifacts.

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

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