Agent conventions + ignore wishlist drafts

AGENTS.md: wishlist-draft flow, few-commits norm, release flow,
secret handling. .gitignore: drafts stay local-only.

AGENTS.md

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+# AGENTS.md — sync_relay_project
+
+Project conventions for agents. Global interaction rules live in the
+user-level AGENTS.md; this file holds repo-specific facts only.
+Source of truth order: codebase > `HANDOFF.md` + `docs/ROADMAP.md` >
+chat history.
+
+## Wishlist drafts
+
+The user drops raw idea/bug lists as drafts (gitignored, never
+committed: `docs/Wishlist.md`, `docs/drafts/`). Agent duty on sight:
+translate each entry into its proper place — `docs/ROADMAP.md`
+backlog (ordered, one sitting-sized item each) or Epics, real bugs
+with repro detail preserved — then confirm placement with the user
+and delete the draft. Drafts must never be committed, even partially.
+
+## Commits
+
+Few commits, one per topic/session — never per fix. Rewriting
+unpushed history (amend, squash) is expected, not exceptional.
+Commit code + its docs together. No `flutter analyze` unless asked
+or diagnosing; scoped `dart analyze` on touched files is the
+pre-commit check. Tests run only when the code under test changed.
+
+## Releases (user pushes tags, CI does the rest)
+
+Release flow: release commit bumps `apps/desktop/pubspec.yaml` →
+`git tag vX.Y.Z` → push tag → `.gitea/workflows/release.yml`
+builds, publishes the Forgejo release, commits
+`updates/manifest.json` back. `tool/release_publish.sh` is the same
+flow by hand. Workflows live in `.gitea/workflows` (this forge reads
+`.gitea` first, `.github` is ignored when it exists).
+Never commit secrets: tokens arrive via env (`DISCORD_WEBHOOK_URL`,
+`RELEASE_TOKEN`) or Actions-provided (`GITHUB_TOKEN/GITEA_TOKEN`).