retro-candidate: every session carries two IDs (app project session vs CLI tool) and no record rule says which is canonical

Occurrence: https://github.com/mochan-tk/agentic-dev-kit-for-copilot/issues/136#issuecomment-5739308277

Every app-managed session has two identifiers: the app project session ID shown in the app, and the CLI/tool session ID that list_sessions_and_chats returns as id and that the session tools accept. Startup, dispatch and teardown records in Epic #119 had to carry both (for example the Task #136 supervisor startup above and the Task #138 dispatch record https://github.com/mochan-tk/agentic-dev-kit-for-copilot/issues/119#issuecomment-5739625579), and the coordinator re-resolved them with get_session each time. The session-orchestration skill does not say which identifier a record must cite.

This issue records the bookkeeping friction only (first occurrence); it does not authorize skill changes.

Start with the linked occurrence in issue #136 and compare the supervisor startup and dispatch records in Epic #119, including the identifiers from list_sessions_and_chats and get_session. Done would require a decided canonical-record rule, but this issue explicitly records bookkeeping friction only and does not authorize skill changes.