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/skills/gitea/SKILL.md

@@ -0,0 +1,77 @@
+---
+name: gitea
+description: Create pull requests on Gitea using the tea CLI. Use when the user asks to "create a PR", "open a pull request", "make a PR", "submit PR", or any variation involving pull requests for this repository.
+---
+
+# Gitea Pull Requests
+
+This project uses Gitea (git.rev.iq) for hosting and the `tea` CLI for creating pull requests.
+
+## Prerequisites
+
+- The `tea` CLI is installed via devenv (pinned to 0.10.1 to avoid TTY bugs in 0.11.x)
+- Login is configured via `~/.config/tea/config.yml`
+
+## Creating a Pull Request
+
+When asked to create a PR, follow these steps:
+
+### 1. Check current state
+
+```bash
+git status
+git log --oneline -5
+git diff master...HEAD --stat
+```
+
+### 2. Ensure changes are committed and pushed
+
+If there are uncommitted changes, commit them first. Then push:
+
+```bash
+git push -u origin <branch-name>
+```
+
+### 3. Create the PR using tea
+
+```bash
+tea pr create \
+  -r igm/publisher-dashboard \
+  --title "PR title here" \
+  --description "## Summary
+- Change 1
+- Change 2
+
+🤖 Generated with [Claude Code](https://claude.ai/code)" \
+  --head <source-branch> \
+  --base master
+```
+
+**Important flags:**
+- `-r igm/publisher-dashboard` - Always specify the repo explicitly (required due to SSH remote detection issues)
+- `--head` - The source branch (your feature branch)
+- `--base` - The target branch (usually `master`)
+
+### 4. Return the PR URL
+
+The command outputs the PR URL. Always share this with the user.
+
+## Example Output
+
+```
+# #1 Update packages to export from dist/ (open)
+
+@igm created 2024-01-11    **master** <- **fix-exports**
+
+--------
+
+• No Conflicts
+• Maintainers are allowed to edit
+
+https://git.rev.iq/igm/publisher-dashboard/pulls/1
+```
+
+## Troubleshooting
+
+- If tea fails with TTY errors, ensure you're using tea 0.10.1 (configured in `nix/tea.nix`)
+- The repo flag `-r igm/publisher-dashboard` is required because the SSH remote isn't auto-detected