docs: add CHANGELOG entry for v0.2.0

Author: Test

CHANGELOG.md

@@ -2,6 +2,32 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.2.0] - 2026-03-26
+
+### Added
+
+- Power commands: `top` (live ops), `slow` (query digest), `explain` (collection intelligence), `ls` (databases/collections), `who` (client dependency lookup)
+- `watch` command for continuous anomaly detection with Slack notifications and delta reporting
+- `mcp` command — MCP server mode with 7 agent-native tools (status, doctor, ls, top, slow, explain, who)
+- `users` command for MongoDB user/role audit with unused account detection
+- `grep` command to search collections and indexes by regex pattern
+- `diff` command to compare two status snapshots with structured deltas
+- `snapshot` command to save cluster state for offline analysis
+- `ci-init` command to generate GitHub Actions and GitLab CI pipeline snippets
+- `--policy` flag on status for policy-as-code enforcement (YAML rules)
+- `--baseline` flag on status to suppress known conditions with auto-expiry
+- `--format sarif` output on status and doctor for GitHub Code Scanning integration
+- `--quiet` / `-q` global flag for machine consumption
+- `--verbose` / `-v` global flag for debug logging
+- Executive summary Grafana dashboard (4 key signals)
+- systemd unit file and environment template in deploy/
+
+### Changed
+
+- All logging migrated from log.Printf to structured slog (JSON in serve mode, text in CLI)
+- DSN credentials masked in all log output via MaskDSN helper
+- init command supports `--with-policy` to generate sample policy YAML
+
 ## [0.1.0] - 2026-03-26
 
 ### Added