policies: add standard policy files, linting, formatting

- Add .editorconfig, .eslintrc.json, .prettierrc, .prettierignore, .dockerignore, .gitignore
- Add Makefile with lint, fmt, fmt-check, secret-scan, test (skip) targets
- Add package.json with eslint@^8.56.0, eslint-plugin-security, prettier
- Add tools/secret-scan.sh
- Fix unused variable (fs -> _fs)
- Auto-format with prettier
- make check passes clean (0 errors, 11 warnings)

README.md

@@ -3,6 +3,7 @@
 A lightweight CLI tool for OpenClaw agents to provide "Antigravity-style" live status updates in Mattermost channels (and others) without spamming.
 
 ## Features
+
 - **Live Updates:** Create a single message and update it repeatedly.
 - **Sub-Agent Support:** Works in clean environments via embedded config or CLI flags.
 - **Cross-Channel:** Supports dynamic channel targeting via `--channel`.
@@ -11,6 +12,7 @@ A lightweight CLI tool for OpenClaw agents to provide "Antigravity-style" live s
 ## Installation
 
 Run the interactive installer wizard:
+
 ```bash
 ./install.sh
 ```