feat!: harden raw browser control and packaging

- Add safe-by-default policy gates for raw command surfaces: command, script, and serve-http /command.

- Require explicit opt-ins for page reads, browser control, and high-risk commands such as dom.eval, storage.*, and screenshots.

- Remove all cookies support from CLI, SDK, extension commands, permissions, constants, docs, and tests.

- Add diagnostic, events, watch, workspace, remote, raw command, script, HTTP gateway, tree-view, session import/export, and extension info/capability commands.

- Add Chrome Web Store packaging that strips manifest.key while keeping local packages with a stable native-messaging extension ID.

- Bump browser-cli and extension version to 0.14.1 and cover the new behavior with pytest and extension packaging tests.

BREAKING CHANGE: cookies commands and the b.cookies SDK namespace have been removed; generic raw command execution now blocks non-safe commands unless explicitly allowed.

browser_cli/sdk/extension.py

@@ -6,6 +6,14 @@ from browser_cli.sdk.base import Namespace, sdk_command
 class ExtensionNS(Namespace):
   """Control the browser-cli extension itself."""
 
+  @sdk_command("extension.info", default={})
+  def info(self) -> dict:
+    """Return extension version, runtime metadata, and capabilities."""
+
+  @sdk_command("extension.capabilities", default=[])
+  def capabilities(self) -> list[str]:
+    """Return feature capability strings advertised by the extension."""
+
   @sdk_command("extension.reload")
   def reload(self) -> None:
     """Reload the browser-cli extension service worker.