Agent session memory as a graph: ingest the Copilot CLI session store

[Naseem77]

What

A new ingestion source for the same graph: instead of parsing code, Graphora can now ingest the session database the Copilot CLI already maintains (~/.copilot/session-store.db) and map your work history:

• (:Session)-[:TOUCHED]->(:WorkFile)
• (:Session)-[:IN_REPO]->(:Repo)
• (:Session)-[:REFERENCES]->(:Ref) (PR / issue / commit)

New CLI commands

graphora sessions ingest --days 7
graphora sessions connected file build.yml   # which windows touched this file?
graphora sessions connected ref 275          # which sessions relate to PR 275?
graphora sessions connected repo org/proj

Notes

• Deterministic, read-only on the source, no LLM, idempotent (MERGE everywhere)
• Purely additive: no existing behavior changed
• Tested: 7 new integration tests, full suite 87/87 passing
• Verified against a real session store: 19 sessions, 158 files, 24 refs ingested
• Documented as use case 6 in USECASES.md with captured real output