docs(plan): mark generated-code drift phases 69-70 complete

- Record deterministic sqlc output (identical checksum across runs) and
  the migration source of the media-supply favorite tables
- Note external commits 3037cfe/6adcec4 that landed the generated fix
  and that CI reproduction now passes on origin/main
- Advance task plan to Phase 70 complete with tests and scope guard green

progress.md

@@ -7,6 +7,12 @@
 - Existing uncommitted challenge/circuit-breaker work is preserved and will not be reverted.
 - Reproduced CI with local sqlc v1.30.0. Only `server/internal/tenant/repository/generated/models.go` changed, adding three missing media-supply favorite models (26 lines).
 - Phase 69 is complete; the affected generated artifact is now regenerated and Phase 70 verification is in progress.
+- Re-ran generation and verified an unchanged checksum. Tenant scope guard and the complete backend test suite pass.
+- A parallel Git-status probe unexpectedly returned empty output after previously showing the generated diff; a standalone status check is being run before completion.
+- Standalone audit showed the diff disappeared because external commits `3037cfe` and `6adcec4` were created and pushed during the turn. No commit/reset operation was performed by this agent.
+- Re-ran the exact CI commands on current `origin/main`: sqlc generation is stable and `git diff --exit-code -- server/internal/tenant/repository/generated` returns 0.
+- Phase 70 is complete. Backend `make test`, tenant scope guard, generated checksum stability, and generated-code diff verification all pass.
+- Planning completion check still reports historical unfinished phases 11/12, 17, and 48/49; generated-code phases 69-70 are complete. Only planning files remain locally modified after the pushed fix.
 
 ## 2026-07-14T18:45:00+08:00 - Local same-platform challenge circuit breaker started