feat(protocol): Add sync messaging protocol fields for turn-based coordination

[khaliqgant]

Summary

• Fix AckPayload.response type from boolean to string for richer status codes ('OK', 'ERROR', custom)
• Add JSDoc documentation for correlationId, response, responseData fields in AckPayload
• Update sendSyncAck() signature and call sites to use string response values
• Add comprehensive unit tests for sync messaging types (16 new tests)

Changes

File	Change
src/protocol/types.ts	Fix response?: boolean → response?: string, add JSDoc
src/wrapper/base-wrapper.ts	Update sendSyncAck() parameter type
src/wrapper/tmux-wrapper.ts	Use 'OK'/'ERROR' string values
src/wrapper/relay-pty-orchestrator.ts	Use 'OK'/'ERROR' string values
src/daemon/server.test.ts	Update test to use response: 'OK'
src/wrapper/client.test.ts	Update test to use response: 'OK'
src/protocol/sync-messaging.test.ts	NEW - 16 comprehensive unit tests

Design Decision

Changed AckPayload.response from boolean to string per design doc (SYNC_MESSAGING_PROTOCOL.md:81) to support richer response status codes like 'OK', 'ERROR', 'ACCEPTED', etc. This is backwards compatible as the field remains optional.

Test plan

• TypeScript compilation passes
• All 16 new sync messaging tests pass
• Existing daemon and client tests updated and passing
• Backwards compatible (all sync fields are optional)

Closes #483

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📊 8 files reviewed • 2 need attention

⚠️ Needs Attention:

• src/protocol/types.ts — Modifications to protocol types which could affect messaging integrity and API compatibility.
• src/protocol/types.ts — The added response fields in the AckPayload may require updates in all places where this interface is used.

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