fix(mosaic): honor seat-owned Gitea slots (#1529)

Co-authored-by: Mosaic fleet seat code-be-02 <[email protected]>

docs/reports/code-review/1311-credential-seat-store.json

@@ -0,0 +1,12 @@
+{
+  "summary": "No important actionable issues found. Helper failures remain terminal, and the previously reported token-export regression is fixed. Bash syntax, package JSON, and caller-token export checks passed. The full regression suite was not run because the sandbox is read-only.",
+  "verdict": "approve",
+  "confidence": 0.88,
+  "findings": [],
+  "stats": {
+    "files_reviewed": 6,
+    "blockers": 0,
+    "should_fix": 0,
+    "suggestions": 0
+  }
+}

docs/reports/security/1311-credential-seat-store.json

@@ -0,0 +1,13 @@
+{
+  "summary": "No confident security findings in the six supplied changed files. Seat lookups use the production helper, helper failures remain terminal, and returned credentials are validated. Bash syntax checks passed. Runtime regression tests were not run because the sandbox is read-only.",
+  "risk_level": "none",
+  "confidence": 0.87,
+  "findings": [],
+  "stats": {
+    "files_reviewed": 6,
+    "critical": 0,
+    "high": 0,
+    "medium": 0,
+    "low": 0
+  }
+}