- Split auth into focused package modules for agent keys, file keys,
signing, and post-quantum transport helpers while keeping the public
browser_cli.auth import surface intact.
- Move transport encoding internals into a package with separate codec and
binary-hoisting helpers, preserving browser_cli.transport compatibility.
- Extract remote TCP auth/socket helpers and serve challenge setup out of the
runtime paths to make connection handling easier to reason about.
- Move the extension markdown extractor into a dedicated content/markdown
folder with separate root selection, code normalization, renderer, and utils.
- Centralize CLI Rich rendering helpers for tab/window tree and table output,
and add rendering tests for the shared builders.
- Remove local typing ignores in SDK/decorator/script plumbing and bump the
package and extension version to 0.15.3.
