close-out durability sweep: 4 transcript-only items landed; dc1-is-not-a-mirror warning ...

Operator-requested sweep for content that existed only in the session transcript, before
clearing. Precedent: docs/audit/queued-findings-20260726.txt. Capture:
docs/audit/queued-findings-20260727.txt.

THE CONSEQUENTIAL ONE. scripts/dc-mirror.sh's dc1 site row carried NO warning that dc1 is no
longer a mirror site, so `dc-mirror.sh install dc1` would have SILENTLY REBUILT everything the
same-day teardown removed -- units, nginx vhost, sync helper, and an ENABLED daily debmirror
timer that would start a fresh ~950G pull on a rack whose ruled artifact path is the proxy. That
is precisely the command someone would reach for after treating a failing `check dc1` as a
regression. The row now states dc1 is proxy-only per the D-135 amendment, that `check dc1` FAILS
BY DESIGN, and that `install dc1` is a deliberate strategy change and never a repair. The row is
RETAINED so its measured values survive a legitimate rebuild.
QUEUED, not built (hard rule 1): a RUNTIME guard in do_install for a site whose ruled path is
not the mirror. A comment is strictly weaker than a guard, and prose-only prevention has already
failed twice on this project (DoD item 8 missed dc1; D-137's wiring sat as prose and missed BOTH
DC standups). Recording that the interim is an interim.

A WRONG CLAIM CORRECTED. docs/audit/stage4-mirror-gate-20260727.txt said `systemctl reset-failed`
would re-arm the paused dc1 debmirror. It cannot: reset-failed on the SERVICE does not start an
INACTIVE TIMER. The real vector was a REBOOT -- `enabled` starts the timer at boot and
`Persistent=yes` fires it IMMEDIATELY because its window had passed. Correction APPENDED rather
than edited in place: the file is dated evidence, so a wrong analytical claim is superseded
openly, not quietly rewritten.

THE GENERALISABLE LESSON, previously unrecorded, is now platform-traps section 5:
 5a "stopped is not dormant across a reboot" -- enabled + inactive + EMPTY NextElapse looks
    harmless and is not; plus reset-failed does not re-arm, and Result=signal/status=15 on a
    oneshot means it was SIGTERM'd and never wrote a terminal state (so a stale RUNNING is a
    corpse, not progress).
 5b a `oneshot` with RemainAfterExit=yes does NOT undo its work on stop, so stopping it proves
    NOTHING about dependents -- which is exactly why the dc1 teardown test deleted the live
    address and route instead of stopping the mirror net unit.
Three rows added to the verbatim-error index. Note dc0-mirror-sync.timer is still enabled with
Persistent=yes, so 5a describes dc0 today -- benign while its syncs succeed, same shape.

HARD RULE 2. dc-cache-proxy.sh stated that the two net units coexist safely on one host as
FACT. It is REASONED (idempotent replace verbs, identical measured values), never MEASURED --
the proxy has only run on dc1, where the mirror unit was then removed, so nobody has run both.
Marked accordingly, with an instruction to verify rather than trust the sentence.

VERIFICATION: dangling-reference sweep over docs/, runbooks/, scripts/ and the skill -- every
path this session introduced or cited RESOLVES; all pre-existing dangles are legitimate
(deleted-as-history, not-yet-built, or the deliberately-absent octavia PKI overlay preflight P4
fails on). ledger-scan reconciled against the machine-derived block. Gauntlet ALL GREEN (81),
repo-lint 0-fail, dc-mirror 24/24, dc-cache-proxy 20/20.

Revert: text + comments only; the capture correction is an append.

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