[qoli]

Scope

Anthropic integration for #315's shared Compatibility SPI. Provider PRs are siblings, not a chain.

Depends on #315 cf4ad0d and #312 697ed57, transitively #314/#313 and main's #352. Isolated layer comparison. The comparison also includes the attachment dependency.

• Resolve a profile before each actual request and bind callbacks/Tools to that producing request.
• Preserve canonical/pending history, earlier text, shared nondefault round budgets and the full handoff error payload.
• Retain ordinary provider history behavior; preserve repeated calls and round-scoped outputs rather than globally deduplicating call IDs.
• Retain complete committed-entry identity for hooks/Tools and the public raw-Tool boundary.

Ordinary non-streaming remains one request/return and does not build unused in-flight messages. Profile non-streaming continues as already published; its in-flight encoder uses #312's Tool-only MIME placeholder. Thinking/signatures and file-deletion/Codable/native attachment replay are preserved.

Upstream 1.1 synchronization

Normal history-preserving merges synchronize upstream main 7d43219, including #357 per-request usage accounting, #341 Ollama reasoning, #358 host-scoped Chat Completions reasoning, #300 response-start timeouts, #362 cancellation collection, #364 partial structured snapshots and #366/#367 bounds/reasoning/system-Tool fixes. Earlier #336 final-request usage, #340 HTTPTransport, #297/#325/#331/#343/#352/#354/#356 remain intact. No force-push, new checkout, replacement PR or extra fallback.

RequestsUsage.add reports each completed non-streaming request without double-reporting it. Both streaming and profile non-streaming round-limit checks use entries captured before the current round adds reasoning, so the error contains only rounds that ran. Ordinary streaming/profile streaming/profile response regressions first reproduced three failures, then passed. Ordinary non-streaming remains a single HTTP request/return with no unused inFlight encoding; attachment snapshots, Tool-only MIME lowering and Anthropic signatures remain intact.

Fresh local verification (2026-10-23)

Head 4c30d17. CI=1 GIT_CONFIG_GLOBAL=/dev/null swift test: 973 tests / 100 suites passed. The separate upstream macro test target also passed 2 tests / 1 suite. Strict formatting/diff checks passed. These are compile/offline tests, not live API, model-weight or Apple Intelligence inference acceptance.

The offline suites retain streaming/non-streaming history, callback, reused-ID and handoff accounting regressions. Constructor visibility is still SPI; no new PR or force-push.