docs: add RELEASE_v0.5.1 notes for Bezalel CI/infra upgrade

Refs #192

Documents the 13 commits merged to main:
- Syntax Guard CI (#167)
- Gitea Workflow Automation skill (#181)
- Forge Health Check false-positive fix (#175)
- CI uv caching (#187)
- CI runner container pinning (#180/#174)
- Syntax error fix in test_skill_name_traversal.py (#188)
- Ezra model fallback chain (kimi-k2.5 primary)

All changes verified: syntax guard passes, EXCLUDED_PATH_SEGMENTS
present, Ezra config updated, skill file present.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

RELEASE_v0.5.1.md

@@ -0,0 +1,91 @@
+# Hermes Agent v0.5.1 (v2026.4.7)
+
+**Release Date:** April 7, 2026
+
+> The Forge hardening release — CI pipeline with syntax guard, health check false-positive elimination, Ezra model fallback chain, and Gitea workflow automation skill.
+
+---
+
+## ✨ Highlights
+
+- **Syntax Guard CI** — New `scripts/syntax_guard.py` compiles all `*.py` files pre-merge, preventing broken Python from ever reaching `main`. Integrated as a required step in `.gitea/workflows/ci.yml`.
+
+- **Forge Health Check — 13,449 false positives eliminated** — Added `EXCLUDED_PATH_SEGMENTS` to skip `.cache`, `__pycache__`, `.venv`, `node_modules`, `.git`, `.tox` in sensitive-file scans. Reduced noise from 13,449 false positives to 3 real findings.
+
+- **Ezra resurrected with fallback chain** — Switched Ezra primary from `kimi-for-coding` (terminated 403) to `kimi-k2.5`. Added fallback chain: Kimi → Anthropic → OpenRouter.
+
+- **Gitea Workflow Automation Skill** — New `skills/devops/gitea-workflow-automation/SKILL.md` gives all wizards step-by-step API workflows for creating issues, PRs, comments, and status checks.
+
+---
+
+## 🏗️ CI / Infrastructure
+
+### Syntax Guard (#167)
+- Added `scripts/syntax_guard.py` — compiles all `*.py` files to catch syntax errors before merge
+- Integrated into `.gitea/workflows/ci.yml` as a required step
+
+### CI uv Caching (#187)
+- Enabled `enable-cache: true` with `cache-dependency-glob: "uv.lock"` in all CI workflows
+- Faster CI runs, less redundant dependency resolution
+
+### CI Runner Container Pinning (#180 / #174)
+- Pinned all workflow jobs to `container: catthehacker/ubuntu:act-22.04`
+- Fixes act runner failures (Node.js missing in default container)
+- Gitea Actions now compatible with local act runners
+
+---
+
+## 🐛 Bug Fixes
+
+### Forge Health Check False Positives (#175)
+- Added `EXCLUDED_PATH_SEGMENTS` to skip `.cache`, `__pycache__`, `.venv`, `node_modules`, `.git`, `.tox`, `site-packages`
+- Excluded `.css` files and `secret_scan*.py` tooling from sensitive-file scan
+
+### Syntax Error Fix (#188)
+- Fixed indentation error in `tests/agent/test_skill_name_traversal.py` line 282
+- Unblocked CI — all tests can run again
+
+### Ezra Model Fallback Fix
+- Switched Ezra primary from `kimi-for-coding` (403 terminated) to `kimi-k2.5`
+- Added fallback chain: Kimi → Anthropic → OpenRouter
+- Ezra is operational again with robust failover
+
+---
+
+## 🛠️ New Skills
+
+### Gitea Workflow Automation (#181)
+- `skills/devops/gitea-workflow-automation/SKILL.md`
+- Provides step-by-step API workflows for: listing issues, creating issues, opening PRs, merging PRs, adding comments, creating releases, checking CI status
+- Prerequisites: `GITEA_URL`, `GITEA_TOKEN`, `GITEA_USER` env vars + `curl` and `jq`
+
+---
+
+## Files Changed
+
+```
+.gitea/workflows/ci.yml                  |   9 ++
+.gitea/workflows/notebook-ci.yml         |   1 +
+.github/workflows/*.yml                  |   6 +
+config/ezra-kimi-primary.yaml            |  64 +++++++---------
+scripts/forge_health_check.py            |  22 +++++
+scripts/syntax_guard.py                  |  20 +++++
+skills/devops/gitea-workflow-automation/ | 100 +++++++++++++++++++++++
+tests/agent/test_skill_name_traversal.py |   2 +-
+15 files changed, 190 insertions(+), 38 deletions(-)
+```
+
+---
+
+## Verification
+
+- [x] Syntax guard passes: `python3 scripts/syntax_guard.py` → "All Python files compile successfully"
+- [x] `EXCLUDED_PATH_SEGMENTS` present in `scripts/forge_health_check.py`
+- [x] `skills/devops/gitea-workflow-automation/SKILL.md` present
+- [x] Ezra config: `kimi-k2.5` primary with Anthropic + OpenRouter fallback chain
+- [x] Fast-forward merge completed successfully
+- [x] No dependency changes (`pyproject.toml`, `requirements.txt` unchanged)
+
+---
+
+*Compiled by Claude — reviewing Bezalel's upgrade report (issue #192)*