Make on-demand AI feature-bundle installs reliable and self-healing, closing
the failure modes behind most "some tool doesn't work" reports.
Multi-bundle installs: tools needing more than one bundle (Passport Photo,
Enhance Faces) install every required bundle from one action and stay
not-installed until all are present. Verified across all 19 AI tools.
Downloads: self-heal the accelerated Hugging Face (Xet) client so an upgraded
venv no longer silently falls back to slow urllib; restart instead of
corrupting a resumed partial when a proxy ignores Range and returns 200;
verify the completed size; fail fast on disk-full and HTTP 4xx; retry
transient errors five times; add hf_transfer fallback and document Xet egress.
Install integrity: crash-atomic venv writes so a killed or out-of-space
install can no longer tear the shared venv and break other tools; a boot
breadcrumb reseeds a torn venv to a clean state automatically; a post-install
smoke import test refuses to record a bundle whose libraries cannot load; an
install watchdog stops a wedged installer that would otherwise hold the venv
writer lock forever.
Adds unit and end-to-end tests for every failure mode above.
The persistent Python dispatcher rejects scripts whose feature bundle is not
installed, but the per-request fallback (used when the dispatcher is down, e.g.
restarting right after a model repair) spawned scripts directly and bypassed
that gate. Behavior was therefore inconsistent: a gated script would fail under
the dispatcher but run under the fallback -- the "works once after a repair"
symptom from the original report.
- add packages/ai/src/feature-gate.ts: SCRIPT_BUNDLE_MAP + missingBundleForScript,
mirroring TOOL_BUNDLE_MAP in dispatcher.py, reading the same installed.json and
failing closed exactly like dispatcher._get_installed_bundles()
- runPerRequest now rejects with "feature_not_installed" (the same message the
dispatcher path surfaces) when a gated script's bundle is not installed
- unit tests for the gate, plus a drift test pinning the TS map to dispatcher.py
Closes#327
