fix(hooks): add read-before-edit guard for non-Claude runtimes (#1645)

* fix(hooks): add read-before-edit guidance for non-Claude runtimes

When models that don't natively enforce read-before-edit hit the guard,
the error message now includes explicit instruction to Read first.
This prevents infinite retry loops that burn through usage.

Closes #1628

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

* fix(build): register gsd-read-guard.js in HOOKS_TO_COPY and harden tests

The hook was missing from scripts/build-hooks.js, so global installs
would never receive the hook file in hooks/dist/. Also adds tests for
build registration, install uninstall list, and non-string file_path.

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

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

scripts/build-hooks.js

@@ -18,6 +18,7 @@ const HOOKS_TO_COPY = [
   'gsd-check-update.js',
   'gsd-context-monitor.js',
   'gsd-prompt-guard.js',
+  'gsd-read-guard.js',
   'gsd-statusline.js',
   'gsd-workflow-guard.js'
 ];