v0.53.0

Changed

• Added explicit scalability benchmark indexing-decision metadata and refreshed
  the committed scan evidence for when to keep or revisit the linear
  scope-conflict scan.
• Added synapse ttl-advice for read-only adaptive lease TTL advice from
  durable event-log samples while preserving explicit manual TTL control.
• Added synapse reliability for evidence-only reliability memory over the
  durable event store, tracking stale claims, declared failed-check evidence,
  broken handoff candidates, and conflict pairs without producing scores.
• Added synapse postmortem for replayable task postmortems from the durable
  event store, including timeline, owners, releases, evidence notes,
  reconstructed conflicts, and candidate unanswered messages.
• Added a public integration demo matrix with bounded CLI, MCP, and local A2A
  walkthroughs that list supported behavior and keep external validation open.
• Refreshed the public comparison page with concrete, locally verifiable
  differences for file-scope claims, Git hooks, durability, metrics, MCP, A2A,
  receipts, and local-first operation.
• Added synapse doctor --redeploy-checklist so post-release local fleet
  restarts have copyable package, service, roster, durable-state, and git-hook
  verification steps without the diagnostic command mutating services.
• Added tools/audit_dependency_tooling.py --check to keep the local preflight,
  action pinning, Dependabot ecosystems, and PyPI publish/download metadata
  surfaces from drifting silently.