Harden single-session lifecycle

[slate-rehm]

Summary

Address promotion review findings before the 0.7.0-beta.1 release.

• Recover failed descriptors instead of creating a second managed target.
• Enforce one timeout budget across restart and reset stages.
• Keep heartbeat intervals below the activity expiry window.
• Archive telemetry when reset quarantines a session.
• Restore structured error and audit handling for FIFO admission timeouts.
• Ignore generated fixture settings data.

Verification

• npm run check
• npm run typecheck
• npm test: 468 tests
• npm run smoke
• npm run acceptance: 20 checks
• npm run workspaces: 7 checks
• live settings E2E: 92 checks

Note

Harden single-session lifecycle with deadline-based timeouts and telemetry archiving

• makeReady and openIsolated in session.ts now propagate a single unified deadline across session creation, wait, and restart steps instead of independent per-step timeouts.
• Failed session descriptors are no longer filtered out during selection; selectSingletonDescriptor retains them so makeReady can attempt a restart instead of creating a duplicate session.
• obsidian_session_open archives the previous session's telemetry to the quarantined root on reset and returns the archive path in archivedTelemetry.
• Tool invocations in registry.ts that fail before acquiring the CallLock now log a warning, emit an audit event, and return a structured error result.
• ActivityGuard in activity-guard.ts now rejects idleTimeoutMs < 1000 at construction time and allows heartbeat intervals as low as 250 ms.

^{Macroscope summarized 4b547f2.}

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[slate-rehm]

#AI-Automation

CI passed without failures on Node 20, 22, and 24, including the packaged-install gate.

Review-driven changes:

• Recovered failed descriptors instead of creating a second target.
• Shared one absolute timeout deadline across reset and startup stages.
• Kept heartbeat timing safely below the activity expiry window.
• Archived managed-session telemetry during reset quarantine.
• Restored structured errors and audit events for FIFO admission timeouts.
• Added regression coverage for failed descriptor reuse and short activity windows.
• Ignored generated settings-fixture data.
• Resolved the Macroscope review thread.