Initialize Odin planning context

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. If `CONTEXT-MAP.md` exists, use it to find the relevant context docs.
+- `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 or suggest creating them upfront; `/domain-modeling` creates them when terms or decisions are resolved.
+
+## File structure
+
+This repo uses the single-context layout:
+
+```text
+/
+├── CONTEXT.md
+├── docs/adr/
+└── src/
+```
+
+## Use the glossary's vocabulary
+
+When your output names a domain concept, use the term as defined in `CONTEXT.md`. If a needed concept isn't there, reconsider the terminology or note the gap for `/domain-modeling`.
+
+## Flag ADR conflicts
+
+If your output contradicts an existing ADR, surface it explicitly rather than silently overriding it.