Adds experimental session sync (`@earendil-works/pi-durable/sync`).
Devices upload and pull a session's commits through a remote, reading
them from the Chord store's outbox and applying them with `applyBatch`.
If two devices continue the same session, the one that uploads second
forks to a new session.
I took out the extra sequence indexes from the earlier version of this
branch, since the Chord outbox already persists every commit, so this no
longer touches storage.
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Co-authored-by: Armin Ronacher <armin.ronacher@active-4.com>
The worker registers pi-ai's lazy OAuth and Bedrock loaders, so they are chunks of the
snapshot instead of pi-ai source files loaded at run time. The worker entry imports
chord/workers/child and host-packages.ts instead of plugins.ts: a fork loads no esbuild,
no server API and no provider SDK (690 to 301 modules on the phone).
p2 (Pi Mobile on Chord v2) moves from pi-private into pi as one commit. Root scripts that loop all workspaces
use --if-present; npm test, ./test.sh and the release script cover packages/* only (p2: cd apps/p2 && npm test);
sync-versions also updates apps' workspace pins.