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Stream sub-agent events from context providers

Context providers can now stream the events from their sub-agents, so a provider that runs its own agent surfaces that work as it happens instead of going quiet until the final result.

Honor temperature=0 on Claude for deterministic output

Claude on Anthropic, AWS, and VertexAI used to silently drop an explicit 0 for temperature, top_p, or top_k, since a bare truthiness check treated 0.0 as unset and fell back to the API default near…

Make PgVector prefix matching actually match prefixes

PgVector(prefix_match=True) used to be a silent no-op: it appended a * and then routed through websearch_to_tsquery, which ignores wildcards.