<!-- task=m-principal-provider-credential-slot-routing/09+08_migration_attribution plan=5 tag=REVIEW_REVIEW_REVIEW_REVIEW_API milestone-task=compat-migration,slot-attribution -->

# Complete - m-principal-provider-credential-slot-routing/09+08_migration_attribution

## Completion Time

2026-08-02

## Summary

Completed credential-plane migration source fencing and immutable credential-slot attribution after six plan iterations and five formal reviews; final verdict PASS with `review_rework_count=4`.

## Loop History

| Plan | Review | Verdict | Notes |
|------|--------|---------|-------|
| `plan_cloud_G09_0.log` | `code_review_cloud_G10_0.log` | NOT REVIEWED | The initial pair was superseded while the exact secure-delivery predecessor evidence was unavailable. |
| `plan_cloud_G09_1.log` | `code_review_cloud_G10_1.log` | FAIL | Managed validation did not yet reject custom profile auth headers or profile URL user-info sources. |
| `plan_local_G05_2.log` | `code_review_cloud_G05_2.log` | FAIL | Referenced backing-adapter credentials remained accepted and the submitted temporary-directory evidence was contradicted. |
| `plan_cloud_G06_3.log` | `code_review_cloud_G06_3.log` | FAIL | The fixtures did not construct real backing references and several commands lacked independent exit-status evidence. |
| `plan_cloud_G04_4.log` | `code_review_cloud_G04_4.log` | FAIL | Both real backing-reference fixtures used identical header casing and did not lock case-insensitive matching. |
| `plan_cloud_G04_5.log` | `code_review_cloud_G04_5.log` | PASS | Exact-name and one-enabled type-fallback case variants, safe-path/non-echo assertions, and the full fresh verification packet passed. |

## Implementation and Cleanup

- Added explicit legacy-versus-managed credential-plane composition with fail-closed rejection of competing principal, provider, profile, adapter, environment, argument, endpoint, and caller-supplied credential sources.
- Preserved immutable `credential_slot_ref` and credential revision across dispatch and provider usage while keeping inbound `token_ref` and unsafe aliases/secrets out of the slot attribution contract.
- Locked case-insensitive custom profile auth-header detection for both exact named and one-enabled legacy type-fallback backing adapters without changing production behavior in the final correction.
- Recorded independent fresh command output, removed the repository-local executable temporary directory, and left unrelated dirty-worktree changes untouched.

## Final Verification

- `TMPDIR=/config/workspace/iop-s0/.agent-migration-attribution-review-tmp go test -count=1 ./packages/go/config -run 'TestCredentialPlane'` - PASS; focused credential-plane regressions completed in 0.025s.
- `TMPDIR=/config/workspace/iop-s0/.agent-migration-attribution-review-tmp go test -count=1 ./packages/go/config ./apps/edge/internal/bootstrap ./apps/edge/internal/input` - PASS; all three packages completed successfully.
- `TMPDIR=/config/workspace/iop-s0/.agent-migration-attribution-review-tmp go test -count=1 ./apps/edge/internal/openai ./apps/edge/internal/service` - PASS; OpenAI and service regressions completed successfully.
- `TMPDIR=/config/workspace/iop-s0/.agent-migration-attribution-review-tmp go test -count=1 -race ./apps/edge/internal/openai ./apps/edge/internal/service` - PASS; both packages completed with no race report.
- `TMPDIR=/config/workspace/iop-s0/.agent-migration-attribution-review-tmp go vet ./apps/edge/... ./packages/go/...` and `git diff --check` - PASS; no output or findings.
- Deterministic adapter/profile reference scan - PASS; both backing adapter keys are `x-custom-key` while profile auth headers remain `X-Custom-Key`.
- Temporary-directory cleanup - PASS; `/config/workspace/iop-s0/.agent-migration-attribution-review-tmp` is absent.
- Repo-internal Edge-Node diagnostics, auxiliary E2E smoke, and full-cycle runtime execution were not run because the final follow-up is a deterministic regression-fixture casing correction with no production or user execution path change.

## Remaining Nit

- None.

## Follow-up Work

- None.
