Initial commit: agent skills setup

Add project skills, CLAUDE.md with Agent skills section, and
docs/agents config (local markdown issue tracker, single-context domain docs).

CLAUDE.md

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+## Agent skills
+
+### Issue tracker
+
+Issues live as local markdown files under `.scratch/<feature>/`. See `docs/agents/issue-tracker.md`.
+
+### Domain docs
+
+Single-context: one `GLOSSARY.md` + `docs/adr/` at the repo root. See `docs/agents/domain.md`.

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
+
+- **`GLOSSARY.md`** at the repo root, or
+- **`GLOSSARY-MAP.md`** at the repo root if it exists: it points at one `GLOSSARY.md` per context. Read each one relevant to the topic.
+- **`docs/adr/`**: read ADRs that touch the area you're about to work in. In multi-context repos, also check `src/<context>/docs/adr/` for context-scoped decisions.
+
+If any of these files don't exist, **proceed silently**. Don't flag their absence; don't suggest creating them upfront. The `/dev-domain-modeling` skill (reached via `/dev-plan-interview-by-docs` and `/dev-improve-codebase-architecture`) creates them lazily when terms or decisions actually get resolved.
+
+## File structure
+
+Single-context repo (most repos):
+
+```
+/
+├── GLOSSARY.md
+├── docs/adr/
+│   ├── 0001-event-sourced-orders.md
+│   └── 0002-postgres-for-write-model.md
+└── src/
+```
+
+Multi-context repo (presence of `GLOSSARY-MAP.md` at the root):
+
+```
+/
+├── GLOSSARY-MAP.md
+├── docs/adr/                          ← system-wide decisions
+└── src/
+    ├── ordering/
+    │   ├── GLOSSARY.md
+    │   └── docs/adr/                  ← context-specific decisions
+    └── billing/
+        ├── GLOSSARY.md
+        └── docs/adr/
+```
+
+## 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 `GLOSSARY.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 `/dev-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: Local Markdown
+
+Issues and specs for this repo live as markdown files in `.scratch/`.
+
+## Conventions
+
+- One feature per directory: `.scratch/<feature-slug>/`
+- The spec is `.scratch/<feature-slug>/spec.md`
+- Implementation issues are one file per ticket at `.scratch/<feature-slug>/issues/<NN>-<slug>.md`, numbered from `01`, never a single combined tickets file
+- Triage state, if used, is recorded as a `Status:` line near the top of each issue file
+- Comments and conversation history append to the bottom of the file under a `## Comments` heading
+
+## When a skill says "publish to the issue tracker"
+
+Create a new file under `.scratch/<feature-slug>/` (creating the directory if needed).
+
+## When a skill says "fetch the relevant ticket"
+
+Read the file at the referenced path. The user will normally pass the path or the issue number directly.
+
+## Wayfinding operations
+
+Used by `/wayfinder`. The **map** is a file with one **child** file per ticket.
+
+- **Map**: `.scratch/<effort>/map.md` (the Notes / Decisions-so-far / Fog body).
+- **Child ticket**: `.scratch/<effort>/issues/NN-<slug>.md`, numbered from `01`, with the question in the body. A `Type:` line records the ticket type (`research`/`prototype`/`interview`/`task`); a `Status:` line records `claimed`/`resolved`.
+- **Blocking**: a `Blocked by: NN, NN` line near the top. A ticket is unblocked when every file it lists is `resolved`.
+- **Frontier**: scan `.scratch/<effort>/issues/` for files that are open, unblocked, and unclaimed; first by number wins.
+- **Claim**: set `Status: claimed` and save before any work.
+- **Resolve**: append the answer under an `## Answer` heading, set `Status: resolved`, then append a context pointer (gist + link) to the map's Decisions-so-far in `map.md`.