chore: npm publish setup, fallback docs, release workflow (fixes #49)

- package.json: yaml in devDependencies, repo url/bin from npm pkg fix
- README, GETTING_STARTED, FAQ: fallback npx github:sickn33/antigravity-awesome-skills on 404
- publish-npm.yml: workflow on release published + workflow_dispatch
- MAINTENANCE: bump package.json, publish to npm (manual + NPM_TOKEN CI)
- release_cycle.sh: catalog step, version check, npm publish reminder
- ISSUE_49_COMMENT.md: suggested reply for issue #49

.github/ISSUE_49_COMMENT.md

@@ -0,0 +1,15 @@
+Suggested comment for [Issue #49](https://github.com/sickn33/antigravity-awesome-skills/issues/49). Paste this on the issue:
+
+---
+
+The 404 happens because the package wasn’t published to npm yet. We’ve addressed it in two ways:
+
+1. **Publish to npm** – We’re set up to publish so `npx antigravity-awesome-skills` will work after the first release. You can also trigger a manual publish via the “Publish to npm” workflow (Actions tab) if you have `NPM_TOKEN` configured.
+
+2. **Fallback** – Until then (or if you hit a 404 for any reason), use:
+   ```bash
+   npx github:sickn33/antigravity-awesome-skills
+   ```
+   The README, GETTING_STARTED, and FAQ now mention this fallback.
+
+Thanks for reporting.