feat(mcp): observability audit export tools (#77)

[jusso-dev]

Summary

Closes #77 / tracker #78 item 6.

• muster_list_invocations — recent mcp.tool.invoked audit rows (needs audit.read)
• muster_export_audit — bounded export of MCP/integration/knowledge audit actions (needs audit.export)
• Metadata allow-list only (hashes, outcomes, tool versions) — no CoT / prompts
• Explicit replay.mayRepeatExternalActions: false

Test plan

• unit tests + tsc on @muster/mcp

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Review details

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Run ID: c6e87947-3d86-4873-a365-f3418acd2a6b

📥 Commits

Reviewing files that changed from the base of the PR and between 0e624ae and 99db495.

📒 Files selected for processing (7)

• packages/mcp/src/actions.test.ts
• packages/mcp/src/constants.ts
• packages/mcp/src/index.ts
• packages/mcp/src/mcp.integration.test.ts
• packages/mcp/src/observability.ts
• packages/mcp/src/server.ts
• skills/policy-bundle.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/mcp-observability-77

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