fix(install): template hook paths for OpenCode/Gemini runtimes (#585)

Hooks had hardcoded `.claude` paths that broke OpenCode users. The
installer now templates `.js` hooks with runtime-specific config dirs,
same as it already does for `.md` files. Also added `./.claude/`
replacement for local install paths in workflows.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

commands/gsd/reapply-patches.md

@@ -14,11 +14,11 @@ After a GSD update wipes and reinstalls files, this command merges user's previo
 Check for local patches directory:
 
 ```bash
-# Global install
-PATCHES_DIR="${HOME}/.claude/gsd-local-patches"
+# Global install (path templated at install time)
+PATCHES_DIR=~/.claude/gsd-local-patches
 # Local install fallback
 if [ ! -d "$PATCHES_DIR" ]; then
-  PATCHES_DIR="./.claude/gsd-local-patches"
+  PATCHES_DIR=./.claude/gsd-local-patches
 fi
 ```