addendum 26: DOCFIX-094 stderr-separation fixes (cloud-assert fail-open closed) + vault snap-track measurements + juju auth-expiry blocker ...

Gauntlet ALL GREEN (32 harnesses; cloud-assert 12/12 incl. new fail-open
proof cases). Read-only vault measurements landed before the juju macaroon
expired; operator needs interactive 'juju login' for the remaining reads.

Revert: per addendum-26 REVERT line.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

cloud-assert A7: read PO: marker from status JSON (DOCFIX-087) ...

Identifier consumed: DOCFIX-087. juju 3.6 --format=line omits workload
messages, so A7's line-format grep false-FAILed a healthy policy override
(found live at ops-update-20260705 pre-flight; window HELD on operator
Option B ruling until this true-PASS fix landed). A7 now greps the
application-status message + all unit workload messages from --format=json;
fail-closed on parse failure. Harness: truthful JSON fixtures replace the
line-format fiction; new T10 regression case; 10/10, gauntlet 31/31.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FCGjrRXtbPRu5qEThw3CDz

Patches