Update to v86 HEAD with IDE shared-register fix

Patches src/ide.js before building: restores the dual master+slave writes
for ATA Command Block registers (Features, Sector Count, LBA Low/Mid/High)
that 1b90d2e7 changed to current_interface-only. Those registers are
channel-shared per ATA spec; Win95's ESDI_506.PDR writes them then switches
drive-select expecting the values to persist. Found via JS-only bisect.

Boots fresh in ~32s with the same sporadic-bluescreen rate as the prod build.
The new build has the tcp-connection bus event so SMB uses the clean path
instead of the connection-theft hack (guard added for the old-API monkeypatch
to skip if the bus handler already accepted).

tools/update-v86.js applies the source patch automatically. v86 checkout
left clean (patch stashed).

.gitignore

@@ -15,3 +15,4 @@ trusted-signing-metadata.json
 .env
 electron-windows-sign.log
 .npmrc
+/.claude/