* feat(backend): make FeedSourceProvider async
Make feedSourceForUser and FeedSourceProviderFn return promises.
Use Promise.allSettled to tolerate partial provider failures.
Guard concurrent getOrCreate calls with in-flight promise dedup.
Return 503 from HTTP handlers when session creation fails.
Co-authored-by: Ona <no-reply@ona.com>
* fix(backend): handle remove() during in-flight session creation
Cancel pending getOrCreate when remove() is called mid-flight.
Destroy the resulting session to prevent it from leaking.
Co-authored-by: Ona <no-reply@ona.com>
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Co-authored-by: Ona <no-reply@ona.com>
* feat(backend): add GET /api/context endpoint
Query context values by key with exact/prefix match
support. Default mode tries exact first, falls back
to prefix.
Co-authored-by: Ona <no-reply@ona.com>
* fix(backend): validate context key element types
Reject booleans, nulls, and nested arrays in the key
param. Only string, number, and plain objects with
primitive values are accepted.
Co-authored-by: Ona <no-reply@ona.com>
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Co-authored-by: Ona <no-reply@ona.com>
