fix: rename appfolio-speckit plugin references to sdd

CLAUDE.md

@@ -20,8 +20,8 @@ Read @FORK.md for full context on this fork.
 - Install locally (dev):
   ```bash
   uv tool install . --force --reinstall
-  PLUGIN_ROOT=$(find ~/.claude/plugins/cache -path "*/appfolio-speckit/*/skills" -type d 2>/dev/null | sort -V | tail -1 | sed 's|/skills$||')
-  [ -n "$PLUGIN_ROOT" ] && cp -R ~/src/ai-dev-tools/plugins/appfolio-speckit/* "$PLUGIN_ROOT/"
+  PLUGIN_ROOT=$(find ~/.claude/plugins/cache -path "*/sdd/*/skills" -type d 2>/dev/null | sort -V | tail -1 | sed 's|/skills$||')
+  [ -n "$PLUGIN_ROOT" ] && cp -R ~/src/ai-dev-tools/plugins/sdd/* "$PLUGIN_ROOT/"
   ```
 - 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

FORK.md

@@ -28,7 +28,7 @@ All files listed below are modified from upstream and will likely conflict on me
 
 ## Hook Architecture
 
-The AF extension uses a manifest-driven dispatch between the bundled spec-kit extension and the separate Claude Code plugin (`appfolio-speckit`):
+The AF extension uses a manifest-driven dispatch between the bundled spec-kit extension and the separate Claude Code plugin (`sdd`):
 
 - **Before hooks** (`speckit.af.before-*.md`) run framework guards (version check, constitution, spec-picker) then dispatch to plugin-side hook files via `$APPFOLIO_SPECKIT_PLUGIN_ROOT/hooks.yml`. If the current phase is listed in `phases:`, the hook reads and executes `speckit-hooks/{phase}.md` from the plugin.
 - **After hooks** (`speckit.af.after-*.md`) dispatch to plugin-side hook files the same way, falling back to `speckit-hooks/after-common.md` if no phase-specific file is listed.

extensions/af/commands/speckit.af.common.md

@@ -65,10 +65,10 @@ Do not proceed to the core command — a restart is required regardless.
 
 ## Step 2: Plugin Root
 
-Resolve the appfolio-speckit plugin installation path:
+Resolve the sdd plugin installation path:
 
 ```bash
-find ~/.claude/plugins/cache -path "*/appfolio-speckit/*/skills" -type d 2>/dev/null | sort -V | tail -1 | sed 's|/skills$||'
+find ~/.claude/plugins/cache -path "*/sdd/*/skills" -type d 2>/dev/null | sort -V | tail -1 | sed 's|/skills$||'
 ```
 
 Note the output as `APPFOLIO_SPECKIT_PLUGIN_ROOT`. If the command returns nothing, the plugin is not installed — proceed without it.