Implement Gitea Actions runner substrate

docs/observability-operating-evidence.md

@@ -1,6 +1,6 @@
 # Forge Observability And Operating Evidence
 
-Last reviewed: 2026-06-05
+Last reviewed: 2026-06-07
 
 Status: contract v1. This document defines checks, evidence, and future
 monitoring expectations. It does not authorize a live monitoring deployment,
@@ -68,6 +68,9 @@ Git SSH:
 
 Actions and runners:
 
+- Run `make runner-status` for the current read-only runner, public endpoint,
+  and inter-hub registry probes. The target degrades when optional tools such as
+  `skopeo` or `act_runner` are unavailable.
 - Record runner inventory by semantic label, trust level, and last successful
   sample job.
 - For privileged labels such as `package-publish`, `registry-publish`,
@@ -75,6 +78,8 @@ Actions and runners:
   sample job or release job reference.
 - If no runner currently provides a required label, mark the dependent workflow
   as blocked on runner prerequisites instead of weakening the workflow.
+- The current runner evidence log lives in
+  `docs/gitea-actions-runner-evidence.md`.
 
 ## Storage Growth Checks