docs: use sudo for the quarantine-removal command everywhere (#20)

The bundle contains read-only files (e.g. the bundled OpenSSL dylibs), so a
sudo-less 'xattr -dr com.apple.quarantine' fails with Permission denied for
some users. Standardize on 'sudo xattr -dr com.apple.quarantine' in the
README, ROADMAP, the release.yml SIGNING STATUS comment, and the release
notes; AGENTS.md now requires release notes to carry the macOS first-launch
instructions until a Developer ID cert is secured.

AGENTS.md

@@ -168,6 +168,7 @@ Cut a release by tagging the **`prod`** branch once the PR is merged — `git ta
 - `src/lib/version.test.ts` and `src/lib/docs-coverage.test.ts` if they assert the version
 - **README download links are static (versioned)** — both download tables (top **Download** section + **Which file should I download?**) link directly to the release-tag assets (`releases/download/v0.7.9/<file>`). tauri-action uses default versioned asset names (`Gridline_<ver>_aarch64.dmg`, `Gridline-<ver>-1.x86_64.rpm`, etc.) — update BOTH tables to the new names on every release (see the MAINTENANCE comment in README.md).
 - **Bundled pg tools:** `tauri.conf.json` `bundle.resources` lists `resources/pg_tools/*`; the `release.yml` matrix builds/downloads + checksum-verifies the static binaries before the Tauri build step.
+- **Release notes must include the macOS first-launch instructions** — until a Developer ID signing certificate is secured, releases are ad-hoc signed only (not notarized), so every macOS user hits a Gatekeeper prompt. The draft release body must include: right-click → **Open** → **Open** (or System Settings → Privacy & Security → **Open Anyway**) for "developer cannot be verified", and `sudo xattr -dr com.apple.quarantine /Applications/Gridline.app` (with the re-run-after-every-upgrade note) for "damaged and can't be opened".
 
 ### Adding a Tauri Command