chore: publish pxmon v0.2.0

CONTRIBUTING.md

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+# Contributing
+
+## Development setup
+1. Install Go 1.25+.
+2. Clone repository.
+3. Run:
+   - `go mod tidy`
+   - `go test ./...`
+
+## Build locally
+- `go build -o bin/pxmon ./cmd/pxmon`
+- `go build -o bin/pxmon-agent ./cmd/pxmon-agent`
+
+## Code style
+- Keep changes small and focused.
+- Prefer explicit error messages with command context.
+- Add tests for behavior changes when possible.
+
+## Commit style
+Use clear, scoped commit messages, for example:
+- `feat(cluster): add alert routing batch window`
+- `fix(tui): stabilize panel heights during scroll`
+- `docs: expand command reference`
+
+## Pull requests
+Include:
+- What changed
+- Why it changed
+- How you tested it
+- Any behavior or migration impact