Add CLAUDE.md with project conventions and tool preferences

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

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+# librenot.es
+
+Cloud-native multi-tenant notes application built on Notesium (MIT).
+
+## Project
+
+- Repo: https://git.librete.ch/public/librenotes
+- Remote: `ssh://tengo@git.librete.ch:41240/public/librenotes.git`
+- Stack: Go backend (forked from Notesium), vanilla JS frontend
+- License: MIT (inherited from Notesium)
+
+## Development rules
+
+- **NEVER use sed** for file editing — use perl instead
+- **NEVER install packages on host** — no pip, no nix-shell for deps
+- **NEVER use python** for quick scripts — use perl
+- **NEVER commit to the wrong repo** — this is `/home/mwc/Coding/librenotes`, not `/home/mwc/notes`
+
+## Wave pipelines
+
+- `gt-issue-*` pipelines use `tea` CLI with `--login librete`
+- `gh-issue-*` pipelines use `gh` CLI
+- Personas must be registered in `wave.yaml` under `personas:` key — files alone aren't enough
+- `wave.yaml` is gitignored (local config)
+- `.env` contains GITEA_TOKEN (gitignored)
+
+## Gitea
+
+- Instance: https://git.librete.ch
+- Auth: `tea` CLI, login name `librete`
+- API: https://git.librete.ch/api/v1
+- Issues: https://git.librete.ch/public/librenotes/issues