Four fixes for real-profile browsing (browser.use_real_profile), found and
verified end-to-end on macOS with a live Chrome:
1. _copy_auth_file: sqlite3.connect('file:...?mode=ro') on a live Chrome
auth DB can block indefinitely inside lock negotiation - the busy
timeout never fires, so the 'fail fast' path hangs the launch forever.
Try immutable=1 first (reads instantly, correct for a committed
snapshot of a file another process owns); mode=ro stays as fallback.
2. Launch shape: agent-browser's own launch injects --use-mock-keychain /
--password-store=basic / --headless=new. On macOS the mock keychain
makes Chrome treat every keychain-encrypted cookie as undecryptable
and drop it - the copied profile launches signed out (~3 anonymous
cookies instead of the full jar). Launch the user's real browser
binary directly on the copy (no mock-keychain switches), wait for
DevToolsActivePort, then attach agent-browser via --cdp.
3. Snapshot copy: Local State was copied verbatim, still naming the
SOURCE profile (last_used='Profile 2', info_cache listing several)
while the copy only contains Default. Chrome opens the missing profile
dir and starts signed out. Normalize the copy's Local State to
Default-only.
4. CDP resolution: the agent-browser daemon may report the endpoint of a
browser IT spawned (throwaway temp profile) instead of the real
browser we launched on the copy. Trust the port our browser wrote to
DevToolsActivePort.
Also adds browser.real_profile_pin (optional): pin which source Chromium
profile dir is snapshotted instead of following profile.last_used - on a
machine with a work profile and a personal one, last-used roulette can
silently give the agent the wrong identity. A pin naming a missing dir
fails closed (signed out) rather than falling back to last_used.
Tests: 4 new pin tests + 3 launch tests reshaped to the direct-launch
contract (Popen the real binary, agent-browser attaches). 77 passing.
Jason Pollak
8e746668ba