Add tea 0.10.1 nix derivation and Gitea PR skill

- Pin tea CLI to 0.10.1 to avoid TTY bug in 0.11.x
- Add .claude/skills/gitea for PR creation workflow
- Document tea CLI usage in CLAUDE.md

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -7,6 +7,13 @@ Before starting the dev server, check if it's already running:
 - The dev server runs on port 6827 (may fall back to 6828 if port is in use)
 - Start with `bun run --cwd apps/publisher-dashboard dev` or `devenv up`
 
+## Pull Requests
+
+This repo uses Gitea (git.rev.iq) with the `tea` CLI for pull requests:
+- Use the `/gitea` skill when creating PRs
+- tea 0.10.1 is pinned in `nix/tea.nix` (0.11.x has TTY bugs)
+- Always specify `-r igm/publisher-dashboard` flag (SSH remote auto-detection doesn't work)
+
 ## macOS sed Syntax
 
 macOS uses BSD sed which differs from GNU sed: