chore: add project docs, glossary, research and opencode/fastcrw skills

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

docs/agents/issue-tracker.md

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+# Issue tracker: Gitea
+
+Issues and specs for this repo live as Gitea issues on `git.arthurerlich.de`. Use the `tea` CLI for all operations (see the `gitea-tea` skill).
+
+## Conventions
+
+- **Create an issue**: `tea issues create --title "..." --description "..."`. Use a heredoc for multi-line bodies.
+- **Read an issue**: `tea issues <number>` (shows comments with `--comments`).
+- **List issues**: `tea issues list --state open --fields index,title,body,labels` with `--labels` filters as needed.
+- **Comment on an issue**: `tea comment <number> "..."`
+- **Apply / remove labels**: `tea issues edit <number> --add-labels "..."` / `--remove-labels "..."`
+- **Close**: `tea issues close <number>` (add a comment first with `tea comment`).
+
+Infer the repo from `git remote -v` — `tea` does this automatically when run inside a clone with a configured login. Run `tea --help` / `tea issues --help` if a flag differs in your installed version.
+
+## Pull requests as a triage surface
+
+**PRs as a request surface: no.** _(Set to `yes` if this repo treats external PRs as feature requests.)_
+
+## When a skill says "publish to the issue tracker"
+
+Create a Gitea issue.
+
+## When a skill says "fetch the relevant ticket"
+
+Run `tea issues <number>` with comments.