fc-mesh: Telemetry schema + helpers + standalone /health + CI (Snow rules)

[fortunecat-ops]

fc-mesh: Telemetry schema + helpers + standalone /health + CI (Snow rules)

This PR introduces FortuneCat-standard telemetry to the Slack MCP fork, aligned with Snow rules (deterministic result_code 200/422 + trace_id + timestamp). It includes a JSON Schema contract, TypeScript & Python helpers, a standalone /health server that emits certified events, and CI to guard the schema.

What’s included

• fc_mesh/telemetry.schema.json – contract
• fc_mesh/telemetry_helper.ts / .py – helpers
• fc_mesh/sample_event.json – example (validates)
• cmd/slack-mcp-server/health.ts – emits on start + /health
• fc_mesh/index.ts – barrel export
• .github/workflows/telemetry-ci.yml – schema CI
• docs/TELEMETRY.md – docs; README badges

Snow Rules

• trace_id (uuid), ts (ISO-8601), result_code ∈ {200, 422}

Test plan

• npx tsx cmd/slack-mcp-server/health.ts; curl localhost:9615/health -> ok + JSON line to stdout
• systemd: fc-health running on :9615
• CI: fc-telemetry-ci green

Follow-ups

• Wire helpers into real handlers
• Optional Notion + Relevance ingestion via env stubs
• Optional NGINX /health