Why: after #415 file markers, startup must also bind manifest.instance_id to agent_system_identity (I4). Evidence: python3 -m unittest tests.test_svc_identity tests.test_svc_recover (OK, 1 skipped NOT_RUN for real PG); Backend pin b92eaca (PR #170). Impact: svc ensure/verify + AGENT_SYSTEM_* env; stub identity; I3 SQLite tests; design doc status; modules/backend gitlink. Refs: docs/recovery/u1-identity-manifest.md §5.2; Backend #170 Co-authored-by: Cursor <cursoragent@cursor.com>
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