Bump plugin to 2.39.0 with features from Matt Van Horn (@mvanhorn):
context budget precheck, plan sequence numbers, review serial mode,
agent-browser debugging commands, test-browser port detection, lfg
phase gating, and Context7 API key auth.
Also fixes MCP server merge order so plugin servers correctly
overwrite stale entries during sync.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The sync path's mergeJsonConfigAtKey had incoming entries overwriting
existing user entries on conflict. Reverse the spread order so user
config wins, matching the install path's existing behavior.
Also add merge feedback logging and a test for the sync merge path.
Fixes#125
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
