docs: Enhance documentation for advanced features

[khaliqgant]

Summary

• Significantly enhanced documentation for StatelessLeadCoordinator, Consensus, and Continuity features
• Made advanced features discoverable from main README
• Added comprehensive examples and API documentation

Changes

docs/INTEGRATION-GUIDE.md

• StatelessLeadCoordinator: Added factory function usage, full configuration options, all event types with examples, worker integration patterns, Beads task format, and failover patterns
• Consensus: Explained _consensus as a special target, documented all proposal fields, vote format, result broadcasting, and both high-level and low-level programmatic APIs
• Continuity: Added concept table, documented all 5 actions (save/load/search/uncertain/handoff) with examples, showed response injection format, complete programmatic API, and ledger fields table

docs/agent-relay-protocol.md

• Added continuity commands table with all actions
• Added consensus voting section explaining _consensus target
• Added proposal and vote format documentation
• Added quick reference table for all patterns

README.md

• Added "Advanced Features" section with table linking to all advanced features and EXAMPLES.md

Test plan

• Verified all documented event names match actual code
• Verified continuity command types match code
• Verified consensus command formats match parsers
• All examples use correct API signatures

Closes #511

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📊 41 files reviewed • 3 high risk • 5 need attention

🚨 High Risk:

• src/cloud/api/cli-pty-runner.ts — Replaces 'node-pty' with 'relay-pty', impacting core CLI functionalities.
• .github/workflows/node-compat.yml — Introduces a new CI workflow that could potentially impact the build process.

⚠️ Needs Attention:

• docs/INTEGRATION-GUIDE.md — Crucial for understanding new features integration critically for users.
• docs/agent-relay-protocol.md — Directly supports changes in APIs and CLI commands, critical for end-user understanding.
• +5 more concerns...

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