feat(contracts): reasoning effort — ReasoningEffort ladder (low..max), ProviderStreamOptions/ChatRequest fields, per-conversation GET/PUT types

wire 0.6.1->0.7.0, transport-contract 0.10.0->0.11.0. Additive only; typecheck+biome clean.

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 | **diagnostics** | The errors/warnings/hints a `language server` reports for a file — received both push (`textDocument/publishDiagnostics`) and pull (`textDocument/diagnostic`), then merged + deduped. | lints (when meaning LSP diagnostics) |
 | **workspace root** | The directory a `language server` is rooted at (its `rootUri` and spawn cwd): the nearest root-marker ancestor of a file, bounded above by the conversation's `working directory`. | project root (when meaning the per-server root) |
 | **working directory** | The per-conversation filesystem directory that tools and `language server`s operate within (`ToolExecuteContext.cwd`). Persisted per conversation by `conversation-store`; gettable/settable via the cwd endpoint; defaults a turn's cwd when `/chat` omits it. | cwd (spell out on first use), workdir (when meaning the conversation's directory) |
+| **reasoning effort** | The per-request thinking-depth knob: how much extended thinking the model spends before answering. Ladder `low \| medium \| high \| xhigh \| max` (`ReasoningEffort` in `@dispatch/wire`). Resolution per turn: `ChatRequest.reasoningEffort` override → persisted per-conversation value → default `high`. Each provider maps a level to its native knob in its own code (e.g. Anthropic `thinking.budget_tokens`); providers without such a knob ignore it. | thinking level, effort level, thinking budget (that's the provider-NATIVE knob a level maps to) |
 | **context size** | The number of tokens a conversation currently occupies: the most recent turn's FINAL step `inputTokens + outputTokens` (NOT the aggregate per-turn `usage`, which sums per-step prompts and overcounts a multi-step turn). Stamped on `TurnDoneEvent.contextSize` (live) + `TurnMetrics.contextSize` (persisted); a client reads the LATEST turn's value as current usage. Distinct from the model's **context window** (its max token limit — a later feature). | context window (when meaning current usage), context length, tokens used, context usage |
 
 ## Known vocabulary drift