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

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

docs/agents/domain.md

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+# Domain Docs
+
+How the engineering skills should consume this repo's domain documentation when exploring the codebase.
+
+## Before exploring, read these
+
+- **`CONTEXT.md`** at the repo root
+- **`docs/adr/`** — read ADRs that touch the area you're about to work in.
+
+If any of these files don't exist, **proceed silently**. Don't flag their absence; don't suggest creating them upfront. The `/domain-modeling` skill creates them lazily when terms or decisions actually get resolved.
+
+## File structure
+
+Single-context repo:
+
+```
+/
+├── CONTEXT.md
+├── docs/adr/
+│   ├── 0001-event-sourced-orders.md
+│   └── 0002-postgres-for-write-model.md
+└── src/
+```
+
+## Use the glossary's vocabulary
+
+When your output names a domain concept (in an issue title, a refactor proposal, a hypothesis, a test name), use the term as defined in `CONTEXT.md`. Don't drift to synonyms the glossary explicitly avoids.
+
+If the concept you need isn't in the glossary yet, that's a signal — either you're inventing language the project doesn't use (reconsider) or there's a real gap (note it for `/domain-modeling`).
+
+## Flag ADR conflicts
+
+If your output contradicts an existing ADR, surface it explicitly rather than silently overriding:
+
+> _Contradicts ADR-0007 (event-sourced orders) — but worth reopening because…_

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.

docs/agents/triage-labels.md

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+# Triage Labels
+
+The skills speak in terms of five canonical triage roles. This file maps those roles to the actual label strings used in this repo's issue tracker.
+
+| Label in mattpocock/skills | Label in our tracker | Meaning                                  |
+| -------------------------- | -------------------- | ---------------------------------------- |
+| `needs-triage`             | `needs-triage`       | Maintainer needs to evaluate this issue  |
+| `needs-info`               | `needs-info`         | Waiting on reporter for more information |
+| `ready-for-agent`          | `ready-for-agent`    | Fully specified, ready for an AFK agent  |
+| `ready-for-human`          | `ready-for-human`    | Requires human implementation            |
+| `wontfix`                  | `wontfix`            | Will not be actioned                     |
+
+When a skill mentions a role (e.g. "apply the AFK-ready triage label"), use the corresponding label string from this table.
+
+Edit the right-hand column to match whatever vocabulary you actually use.