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* feat(sse): adapt the Claude flow to Opus 4.7+ adaptive-thinking + fixed-sampling contract
Claude Opus 4.7 and later (Opus 4.7/4.8, Fable 5) changed the Messages API contract:
manual extended thinking was removed (`thinking.type:"enabled"` or ANY `budget_tokens`
returns 400 — adaptive-only, steered by `output_config.effort`) and non-default
`temperature`/`top_p`/`top_k` now return 400 (sampling is fixed). OmniRoute still emitted
both shapes, so OpenAI-format `reasoning_effort` low/medium/high and any client-supplied
sampling param could hard-400 on the most-used provider.
- modelSpecs: new `adaptiveThinkingOnly` flag + `isAdaptiveThinkingOnly()` on opus-4-7/4-8/fable-5
- translator: `reasoning_effort` (every level) -> adaptive + `output_config.effort` for those models
- chatCore: `normalizeClaudeAdaptiveThinking` catch-all collapses residual manual thinking
(passthrough legacy shape / per-model defaults) to `{type:"adaptive"}`, keyed on the model
- registry: strip `temperature`/`top_p`/`top_k` for opus-4-7/4-8/fable-5 (claude + anthropic ids)
Pre-4.7 models (Opus 4.6/4.5, Sonnet, Haiku) keep manual budgets and sampling params.
TDD: +27 cases (adaptive-thinking-normalize, sampling-params, translator). typecheck/lint/file-size green.
* docs(changelog): note Claude Opus 4.7+ adaptive-thinking + fixed-sampling fixes (#4230)