fix: use kireto token for auto-merge approval review

REVIEWER_GITEA_API_TOKEN (emil) is the same user that creates PRs,
so Gitea ignores the self-approval. Switch to
DEVELOPER_GITEA_API_TOKEN (kireto) — a different user — so the
approval counts toward branch protection.

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

docs/specs/GRM-171.md

@@ -0,0 +1,28 @@
+# GRM-171: Use kireto token for auto-merge approval review
+
+## Problem
+The auto-merge workflow posts approval reviews with
+`REVIEWER_GITEA_API_TOKEN` (emil), but emil is also the PR creator.
+Gitea ignores self-approvals, so the merge fails with HTTP 405
+`Does not have enough approvals`.
+
+## Approach
+REQ-1: Change the approval review step in `.gitea/workflows/ci.yml` to use
+  `DEVELOPER_GITEA_API_TOKEN` (kireto) instead of
+  `REVIEWER_GITEA_API_TOKEN` (emil), since kireto is a different user
+  than the PR creator.
+
+## Test Plan
+- `make lint-all` passes (workflow-lint validates the YAML)
+- Next auto-merge PR succeeds (approval posted by kireto, merge completes)
+
+## Deploy Plan
+- Merge to master
+
+## Rollback Plan
+- Revert the merge commit
+
+## Acceptance Criteria
+- [x] REQ-1: Change the approval review step in `.gitea/workflows/ci.yml`
+  to use `DEVELOPER_GITEA_API_TOKEN` (kireto) instead of
+  `REVIEWER_GITEA_API_TOKEN` (emil)