feat: add gitea agentic runtime control plane

.ralph/ralph-loop-plan.md

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+# Ralph Loop Plan
+
+## Goal
+
+Integrate a Gitea-backed agentic workflow runtime into this repository so the product moves from skill-only guidance to a real execution control plane. Deliver a repo-local workflow spec format, compiler, validator, runtime, Gitea provider, safe-output policy enforcement, evidence persistence, automated tests, and one real Gitea acceptance path.
+
+## Acceptance Criteria
+
+1. `workflows/gitea-issue-delivery.md` compiles into a lock artifact.
+2. Invalid workflow specs fail validation with explicit errors.
+3. Runtime refuses undeclared write actions and records evidence for allowed ones.
+4. Automated unit and integration tests pass.
+5. Real Gitea acceptance can read the selected issue and publish an evidence comment when credentials are present.
+6. README and `skills/gitea-issue-devops-agent/SKILL.md` reflect the new runtime model.
+
+## Verification Commands
+
+- `python -m pytest tests/unit tests/integration -q`
+- `python -m pytest tests/acceptance/test_gitea_acceptance.py -q`
+- `python -m engine.devops_agent.cli compile workflows/gitea-issue-delivery.md --output workflows/gitea-issue-delivery.lock.json`
+- `python -m engine.devops_agent.cli validate workflows/gitea-issue-delivery.md`
+- `git diff --check`
+
+## Promises
+
+- completion_promise: `COMPLETE`
+- abort_promise: `ABORT`
+- max_iterations: `5`