Landed with the design call resolved per the owner's pick — **option 1**: the synced store is now endpoint-agnostic (persistDiscoveredModels and managedModelImport no longer drop non-chat models at write time), and chat selectability moved to read time (auto-pool expansion in autoStrategy applies filterChatSelectableModels; the models-route projection already had its chatOnly filter). Your discovery test now passes end-to-end (3/3): /api/show capabilities persist per connection and image/embedding requests route through the advertising host.
Reconciliation notes: conflicted areas merged onto the current tip (adobe discovery import, requestedModel preflight signature, resolvedProvider fast-path coexists with the synced-route override — explicit resolution wins); carried base-red drains (#10055 memoization, #11071 test variants) dropped as already-landed; the managed-model-import exclusion test was propagated to the new contract (image/video models persist; the read filter still hides them from chat pickers — pinned by a new assertion). Full battery: 205/206 focused (the one red is a confirmed periodic-timer timing flake on the loaded devbox — 20/20 isolated), autoCombo vitest 30/30, combo suites 46/46, gates + typecheck clean.
Thank you @yourspraveen — the capability probe + routing design was right; it just needed the store contract opened up. Fixes#11087.
Reworks stream readiness as a ping/zombie filter instead of a semantic content
gate: downstream streaming is released as soon as any structured non-ping SSE
event arrives, replaying the buffered prefix. Removes the fixed 2s first-byte
cap (readiness now inherits REQUEST_TIMEOUT_MS unless STREAM_READINESS_TIMEOUT_MS
is set) so slow first-byte reasoning providers no longer false-504.
Combo stream quality stays strict: validateResponseQuality still requires an
actual content_block / known non-Claude payload before accepting a routed target.
Also normalizes multi-line data: framing, metadata-prefixed events, and final
events that arrive without a trailing blank line.
Integrated into release/v3.8.25.
Co-authored-by: R.D. <rogerproself@gmail.com>
