feat(mosaic): manifest-owned upgrade guard so updates never wipe operator config (#791)

Invert the framework updater from a denylist ("framework owns everything unless
preserved") to an explicit allow-list manifest ("operator owns everything unless
framework"). A path the manifest never anticipated resolves to operator-owned by
the fail-safe default, so it is structurally unreachable by any write or prune.

Root cause (#791): `mosaic update` re-seeds via `install.sh` keep-mode, whose
`rsync -a --delete` + hand-maintained PRESERVE_PATHS denylist wiped operator
paths the denylist forgot (agents/*.conf, policy/*.md, *.local.md, harvester
SOP, tools/_lib/credentials.json, unanticipated fleet files).

- framework-manifest.txt: single SSOT ([framework]/[operator], deny-wins,
  UNKNOWN=>operator fail-safe), read by BOTH installers.
- src/framework/manifest.ts: pure resolver (parse/matchGlob/resolveOwnership/
  frameworkSubtreeRoots/planPrune) — the testable seam.
- tools/_lib/manifest.sh: bash resolver (compiled globs, fork-free hot path),
  sourced by install.sh; parity-tested against the TS resolver.
- install.sh keep mode is now manifest-driven (no --delete): overlay-copy
  framework files, scoped-prune only retired framework files inside shipped
  subtrees. Operator + unknown paths are never written or deleted.
- file-ops.syncDirectory gains an isOperatorOwned guard; file-adapter derives it
  from the shared manifest, replacing the drifted hardcoded preservePaths.

Tests (TDD, red->green):
- HARD GATE test-upgrade-manifest-guard.sh: 10 operator sentinels (incl. an
  unanticipated one) survive a keep-mode reseed byte-identical + mtime-unchanged;
  retired framework file pruned; secret value absent from output. RED 31 fail on
  the old installer -> GREEN 48 pass. Wired merge-blocking into CI.
- manifest-parity.spec.ts (§6.1): bash<->TS agree on 34 paths + subtree roots.
- manifest.spec.ts: 18 tests incl. planPrune property test + shipped-tree
  completeness (§6.2).
- test-install-migration.sh F6 flipped: an unanticipated operator fleet file now
  MUST survive keep-mode reseed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.woodpecker/ci.yml

@@ -42,6 +42,18 @@ steps:
       - bash packages/mosaic/framework/tools/quality/scripts/check-resident-budget.sh --self-test
       - bash packages/mosaic/framework/tools/quality/scripts/check-resident-budget.sh
 
+  # Blocking gate (#791): a framework upgrade must never write or delete an
+  # operator-owned path. The HARD GATE proves an unanticipated operator sentinel
+  # survives a keep-mode reseed byte-identical (both rsync + cp paths); the
+  # migration matrix pins the v2→v3 contract-file semantics. Pure bash, no
+  # node_modules — runs early alongside sanitization.
+  upgrade-guard:
+    image: *node_image
+    commands:
+      - apk add --no-cache bash rsync
+      - bash packages/mosaic/framework/tools/quality/scripts/test-upgrade-manifest-guard.sh
+      - bash packages/mosaic/framework/tools/quality/scripts/test-install-migration.sh
+
   typecheck:
     image: *node_image
     commands:
@@ -50,6 +62,7 @@ steps:
     depends_on:
       - install
       - sanitization
+      - upgrade-guard
 
   # lint, format, and test are independent — run in parallel after typecheck
   lint: