fix: bundle skills directory into npm packages for runtime discovery

The claude-local, codex-local adapters and the server all resolve a
skills/ directory using __dirname-relative paths that only work inside
the monorepo.  When installed from npm the paths point outside the
package and cause ENOENT on readdir/readFile.

- Update both adapter execute.ts files to try a published-path
  candidate (../../skills from dist/) before falling back to the
  monorepo dev path (../../../../../skills from src/).
- Update server readSkillMarkdown() to try the published path first.
- Add "skills" to the files array in server, claude-local, and
  codex-local package.json so npm includes them.
- Update release.sh to copy the repo-root skills/ into each package
  before publish, and clean up after.

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

scripts/release.sh

@@ -138,7 +138,13 @@ pnpm --filter @paperclipai/server build
 pnpm --filter @paperclipai/ui build
 rm -rf "$REPO_ROOT/server/ui-dist"
 cp -r "$REPO_ROOT/ui/dist" "$REPO_ROOT/server/ui-dist"
-echo "  ✓ All packages built (including UI)"
+
+# Bundle skills into packages that need them (adapters + server)
+for pkg_dir in server packages/adapters/claude-local packages/adapters/codex-local; do
+  rm -rf "$REPO_ROOT/$pkg_dir/skills"
+  cp -r "$REPO_ROOT/skills" "$REPO_ROOT/$pkg_dir/skills"
+done
+echo "  ✓ All packages built (including UI + skills)"
 
 # ── Step 5: Build CLI bundle ─────────────────────────────────────────────────
 
@@ -191,6 +197,11 @@ fi
 # Remove UI dist bundled into server for publishing
 rm -rf "$REPO_ROOT/server/ui-dist"
 
+# Remove skills bundled into packages for publishing
+for pkg_dir in server packages/adapters/claude-local packages/adapters/codex-local; do
+  rm -rf "$REPO_ROOT/$pkg_dir/skills"
+done
+
 # Stage only release-related files (avoid sweeping unrelated changes with -A)
 git add \
   .changeset/ \