chore: publish pxmon v0.2.0

docs/RELEASES.md

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+# Releases and Versioning
+
+## Versioning policy
+This project follows Semantic Versioning:
+- `MAJOR`: breaking CLI/API/data changes
+- `MINOR`: backward-compatible features
+- `PATCH`: backward-compatible fixes
+
+Current project version is tracked in [`VERSION`](../VERSION).
+
+## Release process
+1. Update `VERSION`.
+2. Add new section in `CHANGELOG.md` with date and changes.
+3. Run:
+   - `go test ./...`
+   - `go build -o bin/pxmon ./cmd/pxmon`
+   - `go build -o bin/pxmon-agent ./cmd/pxmon-agent`
+4. Tag release:
+   - `git tag vX.Y.Z`
+   - `git push origin vX.Y.Z`
+
+## Versions list
+- `v0.2.0` (2026-06-16): RepoTunneling, remote exec, key passphrase files, export/import key-file restore, and release cleanup.
+- `v0.1.0` (2026-04-17): initial open-source packaging release.
+
+## Agent versions
+Known agent versions are stored in:
+- `internal/cluster/agent_versions.json`
+
+This list is used by agent status/drift checks to flag outdated nodes.