fix: copy plugin manifests into dist/extensions

[bobberb]

Summary

• The gateway discovers plugins by looking for openclaw.plugin.json manifests at dist/extensions/*/openclaw.plugin.json
• The TypeScript build emits compiled .js files into dist/extensions/*/ but does not copy the openclaw.plugin.json manifests from the source extensions/ tree
• After the existing extensions copy step in gateway-install.sh, iterate over extensions/*/openclaw.plugin.json and copy each manifest into its corresponding dist/extensions/*/ directory so the gateway can discover plugins at runtime

Relates to #6, #14.

Test plan

• Build the Nix package and verify dist/extensions/*/openclaw.plugin.json files exist in the output
• Start the gateway and confirm plugins are discovered and loaded

🤖 Generated with Claude Code

[Weirdei]

Tested and confirmed this approach works. We independently arrived at the same fix via a NixOS overlay:

# overlays/openclaw-fix-manifests.nix
final: prev: {
  openclaw-gateway = final.runCommand "openclaw-gateway-fixed" {
    inherit (prev.openclaw-gateway) meta;
    nativeBuildInputs = [final.gnused];
  } ''
    cp -r ${prev.openclaw-gateway} $out
    chmod -R u+w $out
    for ext_dir in $out/lib/openclaw/extensions/*/; do
      ext_name=$(basename "$ext_dir")
      manifest="$ext_dir/openclaw.plugin.json"
      dist_dir="$out/lib/openclaw/dist/extensions/$ext_name"
      if [ -f "$manifest" ] && [ -d "$dist_dir" ]; then
        cp "$manifest" "$dist_dir/"
      fi
    done
    for wrapper in $out/bin/*; do
      if [ -f "$wrapper" ]; then
        sed -i "s|${prev.openclaw-gateway}|$out|g" "$wrapper"
      fi
    done
  '';
}

With this overlay applied, all 74 plugin manifests land in dist/extensions/*/, Telegram channel connects, and the gateway runs cleanly on NixOS. Would love to see this merged so we can drop the workaround.

[Weirdei]

Two additional packaging issues found beyond the manifests fix in this PR:

1. Bundled skills/ directory not copied to package root

The gateway resolves bundled skills via findPackageRootSync → looks for skills/ next to package.json. The nix derivation copies dist/, docs/, extensions/, node_modules/, package.json to lib/openclaw/ but not skills/. The actual skills live deep in node_modules/.pnpm/openclaw@.../node_modules/openclaw/skills/ (53 skills).

Result: resolveBundledSkillsDir() returns undefined → "Bundled skills directory could not be resolved". None of the built-in skills (weather, nano-pdf, summarize, etc.) are available.

Gateway supports OPENCLAW_BUNDLED_SKILLS_DIR env override, but the proper fix is to copy/symlink skills/ into the package root alongside dist/.

2. Wrapper script hardcodes original store path

The nix wrapper at bin/openclaw does:

exec node /nix/store/<original-hash>-openclaw-gateway-unstable-.../lib/openclaw/dist/index.js

If you patch the package (e.g., to fix manifests), the wrapper still points to the unpatched original. Any overlay using runCommand to copy+fix the package must also rewrite wrapper scripts.

Our full overlay handling all three issues: #82 (comment)

[bobberb]

@Weirdei good to close this one?

[Weirdei]

This PR should be merged, not closed — it correctly fixes the manifests issue. The two additional packaging problems I mentioned (missing skills/ dir and wrapper path hardcoding) are tracked separately in #82.

Merging this lets us drop part of our overlay already.