[PsiACE]

Which issue or RFC does this PR close?

No linked issue or RFC.

Rationale for this change

Allow PowerContext to use existing Codex and GitHub Copilot subscriptions for generation. Upgrading Pydantic AI provides credential reuse without adding a login flow.

What changes are included in this PR?

• Upgrade pydantic-ai-slim to >=2.64.0,<3 and adapt inference clients, error handling, tracing, and integration context history.
• Preserve MiniMax embeddings and Jev reranking with HTTPX2 clients.
• Document credential reuse, configuration, and limitations in English and Chinese.

Are there any user-facing changes?

Use openai-codex:<model> with an existing Codex login file, or github-copilot:<model> with an existing OAuth token and a Chat Completions model. These providers support Memory, Experience, and Profile generation. Topic Memory, Dream, and built-in inference protection are unavailable with these providers.

SDK callers supplying HTTP clients for MiniMax embeddings or Jev reranking must use httpx2.AsyncClient.

How was this change tested?

• UV_NO_SYNC=1 make check.
• Regression tests across 20 affected inference, embedding, reranking, Server, evaluation, and Pydantic AI integration test files: 512 passed, 11 skipped.
• Live validation with local subscriptions: openai-codex:gpt-6.1-sol and github-copilot:claude-haiku-4.5. Both passed Server readiness, Memory extraction and storage by a spawned worker, and readback after restart. The Codex login file remained unchanged.

AI usage statement

OpenAI Codex assisted with implementation, documentation, and validation.

[Copilot]

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[hidb4ai]

The dependency upgrade breaks authentication for existing Anthropic-compatible endpoints that require the configured API key in x-api-key.

[hidb4ai]

[P2] Preserve the Anthropic x-api-key header across the SDK upgrade. With generation_model=anthropic:..., a custom base URL, and generation_headers={"x-api-key": "test-key"}, composition removes that header and passes it as api_key to the upgraded Anthropic SDK, which now sends Authorization: Bearer test-key instead. I reproduced this through open_builtin_runtime against a local Anthropic-compatible endpoint requiring x-api-key: it received no such header, returned 401, and generation readiness became misconfigured: provider-rejected. The same change affects ANTHROPIC_API_KEY on custom endpoints. Please preserve the existing header contract for these endpoints and verify both explicit-header and environment-key configurations against a server that enforces authentication.