feat(mosaic): install-ordering guard for lease-enforcement hook wiring (#869 Point-1 C2)

mosaic-link-runtime-assets wired the PreToolUse mutator-gate.py and Stop
receipt-observer-client.py hooks into ~/.claude/settings.json unconditionally.
If the activation half (C1's leaseEnforcementActivatable()) can't be
confirmed on the host, the fail-closed gate then denies every tool call —
bricking it.

Add a TS install-ordering guard (guardClaudeSettingsWiring /
runInstallOrderingGuard, hidden CLI bridge `mosaic __link-claude-settings`)
that imports leaseEnforcementActivatable() directly and decides whether the
enforcement hooks get wired:

  - activatable                    -> wire as-is.
  - NOT activatable, no opt-out    -> strip the enforcement hooks, exit
                                       non-zero with an actionable message
                                       (default, fail-loud).
  - NOT activatable + explicit
    --allow-inactive-enforcement   -> wire anyway, loud warning logged.

--allow-inactive-enforcement is a real CLI flag threaded through
install.sh -> mosaic-link-runtime-assets -> the hidden subcommand —
deliberately never an environment variable, so it can't sit as a
silently-inherited default. Wire mosaic-link-runtime-assets's guarded
settings.json copy to call out to the CLI (with a python3 fallback if
`mosaic` isn't resolvable at all), and stop swallowing stderr in
install.sh/finalize.ts so the guard's message actually reaches the operator.

mutator-gate.py's own fail-closed-on-absent-identity runtime behavior is
untouched (this only gates the WIRING); runtime_tools_unittest.py and
fail-closed-regression.spec.ts remain green.

Part of #869 (Point-1 C2)

packages/mosaic/package.json

@@ -25,7 +25,7 @@
     "lint": "eslint src",
     "typecheck": "tsc --noEmit",
     "test": "vitest run --passWithNoTests && pnpm run test:framework-shell",
-    "test:framework-shell": "python3 src/lease-broker/daemon_deadline_unittest.py && python3 src/lease-broker/normative_fragments_unittest.py && python3 src/lease-broker/receipt_challenge_unittest.py && python3 src/lease-broker/context_recovery_unittest.py && python3 src/lease-broker/recovery_runtime_unittest.py && python3 src/lease-broker/recovery_b1_adversarial_unittest.py && python3 src/lease-broker/framework_skill_portability_unittest.py && python3 src/mutator-gate/runtime_tools_unittest.py && python3 src/mutator-gate/runtime_launch_guard_unittest.py && python3 framework/tools/lease-broker/check-runtime-launches.py --root ../.. && bash framework/tools/codex/test-pr-diff-context.sh && bash framework/tools/qa/test-deps-preflight.sh && bash framework/tools/git/test-pr-review-gitea-comment.sh && bash framework/tools/git/test-ci-queue-wait-branch-absent.sh && bash framework/tools/git/test-git-credential-mosaic.sh && bash framework/tools/git/test-gitea-token-identity.sh"
+    "test:framework-shell": "python3 src/lease-broker/daemon_deadline_unittest.py && python3 src/lease-broker/normative_fragments_unittest.py && python3 src/lease-broker/receipt_challenge_unittest.py && python3 src/lease-broker/context_recovery_unittest.py && python3 src/lease-broker/recovery_runtime_unittest.py && python3 src/lease-broker/recovery_b1_adversarial_unittest.py && python3 src/lease-broker/framework_skill_portability_unittest.py && python3 src/mutator-gate/runtime_tools_unittest.py && python3 src/mutator-gate/runtime_launch_guard_unittest.py && python3 framework/tools/lease-broker/check-runtime-launches.py --root ../.. && bash framework/tools/codex/test-pr-diff-context.sh && bash framework/tools/qa/test-deps-preflight.sh && bash framework/tools/git/test-pr-review-gitea-comment.sh && bash framework/tools/git/test-ci-queue-wait-branch-absent.sh && bash framework/tools/git/test-git-credential-mosaic.sh && bash framework/tools/git/test-gitea-token-identity.sh && bash framework/tools/_scripts/test-install-ordering-guard.sh"
   },
   "dependencies": {
     "@mosaicstack/brain": "workspace:*",