fix(package): include hooks/*.sh files in npm package (#1852 #1862) (#1864)

The "files" field in package.json listed "hooks/dist" instead of "hooks",
which excluded gsd-session-state.sh, gsd-validate-commit.sh, and
gsd-phase-boundary.sh from the npm tarball. Any fresh install from the
registry produced broken shell hook registrations.

Fix: replace "hooks/dist" with "hooks" so the full hooks/ directory is
bundled, covering both the compiled .js files (in hooks/dist/) and the
.sh source hooks at the top of hooks/.

Adds regression test in tests/package-manifest.test.cjs.

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

package.json

@@ -10,7 +10,7 @@
     "commands",
     "get-shit-done",
     "agents",
-    "hooks/dist",
+    "hooks",
     "scripts"
   ],
   "keywords": [