chore: version packages (#889)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -1,5 +1,27 @@
 # agent-browser
 
+## 0.21.0
+
+### Minor Changes
+
+- c6de80b: ### New Features
+
+  - **`batch` command** -- Execute multiple commands from stdin in a single invocation. Accepts a JSON array of string arrays and returns results sequentially. Supports `--bail` to stop on first error and `--json` for structured output (#865)
+  - **iframe support** -- CLI interactions and snapshots now traverse into iframe content, enabling automation of cross-frame pages (#869)
+  - **`network har start/stop` command** -- Capture and export network traffic in HAR 1.2 format (#874)
+  - **WebSocket fallback for CDP discovery** -- When HTTP-based CDP endpoint discovery fails, the CLI now falls back to a WebSocket connection automatically (#873)
+
+  ### Improvements
+
+  - **`--full`/`-f` refactored to command-level flag** -- Moved from a global flag to a per-command flag for clearer scoping (#877)
+  - **Enhanced Chrome launch** -- Added `--user-data-dir` support and configurable launch timeout for more reliable browser startup (#852)
+
+  ### Bug Fixes
+
+  - Fixed `/json/list` fallback when `/json/version` endpoint is unavailable, improving compatibility with non-standard CDP implementations (#861)
+  - Fixed daemon liveness detection for PID namespace isolation (e.g. `unshare`). Uses socket connectivity as the sole liveness check instead of `kill(pid, 0)`, which fails when the caller cannot see the daemon's PID (#879)
+  - Fixed Ubuntu dependency install accidentally removing system packages (#884)
+
 ## 0.20.14
 
 ### Patch Changes