Why: identity ensure/verify went through the normal store open, which
creates a database and runs migrations. A deploy gate that calls the
candidate before stopping the old service could migrate production
ahead of the switch, and a missing database was turned into an empty one.
Evidence: go test ./pkg/identity/ ./internal/store/ ./cmd/agent-system/ -run 'TestCapabilities|TestEnsure|TestVerify|TestDSN|TestUsage|TestSystemIdentity|TestOpenIdentity|TestUnknownSubcommand' passed in this worktree.
Impact: identity CLI refuses a missing file or a missing agent_system_identity table, does not migrate, reads DSN from the environment or a 0600 file, and version --json plus identity capabilities emit one capability document. Unknown top-level commands exit 2.
Refs: recovery plan r3.1 D1; Dev feature/svc-d1-identity-flow
Co-authored-by: Cursor <cursoragent@cursor.com>
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