feat: add af-stable branch for end-user installs

Release workflow now updates af-stable after tagging, so end users
install from a branch that only moves on release.

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

Author: dtoms

.github/workflows/af-tag-release.yml

@@ -31,3 +31,7 @@ jobs:
           echo "Tagging ${TAG}"
           git tag "$TAG"
           git push origin "$TAG"
+
+      - name: Update af-stable branch
+        run: |
+          git push origin HEAD:refs/heads/af-stable --force

CLAUDE.md

@@ -17,9 +17,11 @@ Read @FORK.md for full context on this fork.
 
 ## Development
 
-- Install locally: `uv tool install . --force --reinstall`
+- Install locally (dev): `uv tool install . --force --reinstall`
+- Install from release: `uv tool install git+https://github.com/appfolio/spec-kit@af-stable --force`
 - Test: `specify-af version` then `specify-af init --here --ai claude` in a scratch directory
 - Binary is `specify-af`, package is `specify-af-cli`
+- `af-stable` branch is the end-user install target — only updated when a release is tagged
 
 ## Testing
 

FORK.md

@@ -13,6 +13,21 @@ This is AppFolio's fork of [github/spec-kit](https://github.com/github/spec-kit)
 | New command | `specify-af upgrade` — syncs AF extensions to bundled versions |
 | Version resolution | Uses `packages_distributions()` instead of hardcoded package name |
 | Release workflow | release-please with `af-v*` tags on `af-main` |
+| Install branch | `af-stable` — only updated on release, safe for end-user installs |
+
+## Installing
+
+End users should install from the `af-stable` branch, which only updates when a release is tagged:
+
+```bash
+uv tool install git+https://github.com/appfolio/spec-kit@af-stable --force
+```
+
+To upgrade to the latest release:
+
+```bash
+uv tool install git+https://github.com/appfolio/spec-kit@af-stable --force --reinstall
+```
 
 ## Conflict-Prone Files