feat: add lidarr_dev stack, rewrite prowlarr_dev, align template conventions

- Add lidarr_dev stack with compose.yaml, sample.env, and README
- Rewrite prowlarr_dev to match template conventions (compose.yaml,
  defaults on all vars, proxy network, README sections)
- Set default VOL_PATH to /data (absolute, never ./data)
- Reorder README sections: Overview → Project Details → Getting
  Started → Env Vars → Volume Notes → Network Notes → Docker Run
- Update template-readme.md and AGENTS.md with new conventions

AGENTS.md

@@ -5,12 +5,12 @@
 - Every stack has at least 3 files: `compose.yaml` (dockhand style), `sample.env`, `README.md`
 - `_dev` = experimental, `_notes` = docs/minimal examples, no suffix = production-ready
 - Always references an external `proxy` network (`docker network create proxy` once)
-- Volumes use `${VOL_PATH:-/data}` as the base path
+- Volumes use `${VOL_PATH:-/data}` as the base path (absolute `/data`, never `./data`)
 - Timezone defaults to `America/Vancouver`, but only include if the container requires it.
 - Restart policy, image tag, and port are configurable via env vars with sensible defaults
 - New stacks: copy from `_docs/template-compose.md` and `_docs/template-readme.md`
 - Compose section order: `image` → `restart` → `volumes` → `environment` → `ports` → `networks` → `depends_on` → `healthcheck` → `labels` → `command` → `user`
-- README section order: `Overview` → `Getting Started` → `Docker Run` → `Project Details` → `Environment Variable Notes` → `Volume Notes` → `Network Notes` → `Additional Notes / Gotchas` → `Dockhand Stack, Deploy from Git`
+- README section order: `Overview` → `Project Details` → `Getting Started` → `Environment Variable Notes` → `Volume Notes` → `Network Notes` → `Docker Run` → `Additional Notes / Gotchas` → `Dockhand Stack, Deploy from Git`
 - Every compose file must declare the external `proxy` network at the root level:
   ```yaml
 networks: