feat: mount canonical gitea-workflow skill for Codex and MCP inventory (Closes #551)

Expose gitea-workflow / llm-project-workflow / git-pr-workflows as one
workflow router in mcp_list_project_skills, add preflight + Codex install
script, and document multi-runtime skill name parity.

skills/gitea-workflow/SKILL.md

@@ -0,0 +1,37 @@
+---
+name: gitea-workflow
+description: >-
+  Canonical alias for the Gitea/LLM project workflow router. Same skill as
+  llm-project-workflow. Use at the start of any Gitea-Tools author, review,
+  merge, reconcile, or issue-filing task. Trigger terms: gitea-workflow,
+  llm-project-workflow, git-pr-workflows, gitea, PR review, work-issue.
+---
+
+# gitea-workflow (canonical alias)
+
+This directory is the **stable name** for controller prompts and Codex mounts
+(`gitea-workflow`). The portable implementation lives at:
+
+**[`../llm-project-workflow/SKILL.md`](../llm-project-workflow/SKILL.md)**
+
+## Required action
+
+1. Open and follow `skills/llm-project-workflow/SKILL.md` (router).
+2. Load the matching workflow under `skills/llm-project-workflow/workflows/`.
+3. Do not mutate git/Gitea until the workflow is loaded.
+
+## Multi-runtime names (must resolve identically)
+
+| Name | Role |
+|------|------|
+| `gitea-workflow` | Canonical controller / Codex skill name |
+| `llm-project-workflow` | Portable in-repo skill package |
+| `git-pr-workflows` | Legacy alias |
+
+Install for Codex:
+
+```bash
+./scripts/install-codex-workflow-skill.sh
+```
+
+Preflight via MCP: `mcp_check_workflow_skill_preflight`.

skills/llm-project-workflow/SKILL.md

@@ -6,6 +6,8 @@ description: >-
   report schema. Use at the start of any implementation, review, merge,
   reconciliation, or issue-filing task.
 ---
+> **Also known as:** `gitea-workflow`, `git-pr-workflows` (canonical multi-runtime names — see docs/workflow-skill-mount.md / #551).
+
 
 # LLM Project Workflow Skill