Merge pull request 'docs(ORCH-076): staging gate log — SUCCESS' (#93) from docs/ORCH-076-staging-log into main

docs/work-items/ORCH-076/15-staging-log.md

@@ -0,0 +1,42 @@
+---
+staging_status: SUCCESS
+timestamp: 2026-06-09T11:13:04Z
+base_url: http://localhost:8501
+---
+
+# Staging Gate Log
+
+Staging test suite completed against the live `orchestrator-staging` instance (8501).
+Run canonically **inside** the `orchestrator-staging` container (ORCH-048 / ADR-001) via the
+Docker Engine API `exec` (equivalent to `docker exec`; the host `docker` CLI was unavailable,
+but the script still executed in-container so B6 reads the instance's own `.env.staging`
+process-env — no false registry FAIL).
+
+Command:
+```
+python3 /repos/orchestrator/scripts/staging_check.py --base-url http://localhost:8501 --mode stub
+```
+
+## Result
+
+```
+RESULT: 8/10 checks PASS
+REAL failed         : none
+SANDBOX_INFRA failed: ['C9a Branch appears in orchestrator-sandbox', 'C9b Analyst job enqueued in staging queue']
+tolerance: staging_infra_tolerance_enabled=True
+```
+
+INFRA-WAIVED: C9a Branch appears in orchestrator-sandbox, C9b Analyst job enqueued in staging queue (known sandbox-infra; real checks green)
+
+VERDICT: SUCCESS (exit 0) — SUCCESS (infra-waived): ['C9a Branch appears in orchestrator-sandbox', 'C9b Analyst job enqueued in staging queue'] are known sandbox-infra checks; all real checks green
+
+## Notes
+
+- **Exit code: 0** → `staging_status: SUCCESS` (trusting the exit code per ORCH-061; waived
+  checks are not re-judged).
+- All REAL pipeline checks passed: A1/A2/A3 (smoke), B4/B5/B6 (access + registry isolation),
+  C7/C8 (E2E issue create + webhook trigger).
+- The only failures are the two SANDBOX_INFRA checks **C9a/C9b**, which depend on SANDBOX bot
+  accounts being members of the sandbox Plane project — an infra precondition, not a pipeline
+  regression. They are tolerated (`ORCH_STAGING_INFRA_TOLERANCE_ENABLED=true`) while every REAL
+  check is green; the script printed the `INFRA-WAIVED:` / `VERDICT:` lines above and exited 0.