feat: add gitea-workflow skill with commit conventions and CLI reference

skills/gitea-workflow/SKILL.md

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+---
+name: gitea-workflow
+description: This skill should be used when working in a git repository with a git.sethpc.xyz remote, when the user asks to "commit", "push", "create a repo", "gitea", or when making changes to code that should be committed. Provides commit conventions, CLI reference, and credential safety rules.
+---
+
+# Gitea Workflow — Commit Conventions & CLI
+
+You're working with a repo hosted on Seth's Gitea instance (`git.sethpc.xyz`). Here's how we roll.
+
+## Commit Conventions (default-on, overridable)
+
+These conventions apply unless the project's CLAUDE.md says otherwise:
+
+- **Conventional commits:** Prefix every commit message with a type:
+  - `feat:` — new feature
+  - `fix:` — bug fix
+  - `docs:` — documentation only
+  - `refactor:` — code restructuring, no behavior change
+  - `test:` — adding or updating tests
+  - `chore:` — maintenance, tooling, deps
+- **Commit immediately** — every meaningful change gets its own commit. Don't hoard changes.
+- **Always push after commit** — use `gitea push` or `git push`. Code that isn't pushed is just a fancy diary entry.
+- **No squashing** — every commit is a record. History is sacred (and also useful for debugging).
+- **No batching unrelated changes** — one commit, one concern. If you changed the auth system AND updated the README, that's two commits.
+
+## CLI Reference
+
+The `gitea` CLI handles repo operations against git.sethpc.xyz:
+
+```
+gitea create <name> [--private] [--description "..."]   # Create a new repo
+gitea remote <name>                                      # Set/update git origin with token auth
+gitea push                                               # Push current branch to origin
+gitea delete <name>                                      # Delete a repo (with confirmation)
+gitea list                                               # List your repos
+```
+
+For creating a new project from scratch:
+```bash
+mkdir my-project && cd my-project && git init
+gitea create my-project --description "What it does"
+gitea remote my-project
+# ... write code ...
+git add -A && git commit -m "feat: initial commit"
+gitea push
+```
+
+## Credential Safety
+
+**Never commit these:**
+- `~/.config/gitea/token` or `~/.config/gitea/username`
+- `.env` files containing secrets
+- API keys, tokens, or passwords in any form
+
+**Always ensure `.gitignore` includes:**
+```
+.env
+.env.*
+*.key
+*.pem
+```
+
+If you see credentials in staged files, warn the user immediately and unstage them.
+
+## Override Mechanism
+
+Users can override any convention above in their project's CLAUDE.md. For example, if a project's CLAUDE.md says "squash commits before merge", follow that instead of these defaults. Project-level instructions always win.