refactor: decouple Coin Hunter from Hermes for cross-platform usage

- Add unified coinhunter_shim.py that accepts subcommands (pre/gate/review/rotate-log)
- Update SKILL.md gate pseudocode to read optional ~/.coinhunter/platform.json
- Split cron/setup examples into Hermes and OpenClaw variants across docs
- Introduce platform.json schema in user-data-layout.md
- Remove stale auto_trader.py/run_trader.sh references from auto-trading-guide.md
- Keep legacy shims as backward-compatible wrappers

references/user-data-layout.md

@@ -17,6 +17,7 @@ This keeps personal accounts, positions, and watchlists out of packaged skill ar
 ```text
 ~/.coinhunter/
 ├── config.json
+├── platform.json
 ├── accounts.json
 ├── positions.json
 ├── watchlist.json
@@ -46,6 +47,28 @@ Example:
 }
 ```
 
+### platform.json
+Optional cross-platform runtime configuration. When absent, the framework defaults to Hermes behavior.
+
+Suggested fields:
+- `platform` — runtime name (`"hermes"` or `"openclaw"`)
+- `scripts_dir` — where platform shims are deployed
+- `env_file` — path to the environment file for secrets
+- `cron_command` — command array used by the external gate to trigger a job
+- `delivery` — default delivery channel (`"telegram"`, `"webhook"`, etc.)
+
+Example:
+
+```json
+{
+  "platform": "openclaw",
+  "scripts_dir": "~/.openclaw/scripts",
+  "env_file": "~/.openclaw/.env",
+  "cron_command": ["openclaw", "trigger"],
+  "delivery": "webhook"
+}
+```
+
 ### accounts.json
 Store exchange accounts and balances.