Add MCP and CLI smoke suites

[jlitola]

Summary

• Add live MCP and CLI smoke suites covering every user-facing tool/command with structural UX assertions.
• Validate forced unauthenticated behavior, compact default text, JSON opt-in shape, and representative CLI/MCP JSON parity.
• Document smoke maintenance expectations in agent instructions and MCP/CLI parity docs.

Verification

• bun run typecheck
• bun test
• bun run build
• bun run smoke:mcp
• bun run smoke:cli

Notes

• Feedback coverage uses validation/auth paths only so smoke does not submit fake ranking feedback to the live backend.