docs(ai): document docker-exec pattern for hosts without native toolchains

The code-server LXC has bun and docker but no python/node/npm on PATH,
which left Codex unable to reproduce build/test commands. Adds a 6-line
block to PROJECT_CONTEXT.md showing the docker exec resolutionflow_{backend,frontend}
form, and updates the AGENTS.md "Tooling you do NOT have" line to point
Codex at it instead of suggesting toolchain installs.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.ai/PROJECT_CONTEXT.md

@@ -89,6 +89,15 @@ python -m scripts.seed_trees                                        # seed (from
 
 **Never pass `--rev-id`** to alembic — let it generate the hex hash.
 
+**On hosts without native `python`/`node`/`npm`** (e.g. the code-server LXC), run commands inside the already-running containers instead:
+
+```bash
+docker exec resolutionflow_backend pytest --override-ini="addopts="
+docker exec resolutionflow_backend alembic upgrade head
+docker exec -w /app resolutionflow_frontend npm run build
+docker exec -w /app resolutionflow_frontend npx tsc -b
+```
+
 ---
 
 ## URLs & test users