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.

2 files changed, 11 insertions, 2 deletions

diff --git a/packages/kernel/src/contracts/index.ts b/packages/kernel/src/contracts/index.ts
index 10025e2..ffcbe76 100644
--- a/packages/kernel/src/contracts/index.ts
+++ b/packages/kernel/src/contracts/index.ts
@@ -95,6 +95,7 @@ export type {
 	ProviderStreamOptions,
 	ProviderToolCallEvent,
 	ReasoningDeltaEvent,
+	ReasoningEffort,
 	TextDeltaEvent,
 	Usage,
 	UsageEvent,
diff --git a/packages/kernel/src/contracts/provider.ts b/packages/kernel/src/contracts/provider.ts
index 0686c19..7f920c5 100644
--- a/packages/kernel/src/contracts/provider.ts
+++ b/packages/kernel/src/contracts/provider.ts
@@ -6,12 +6,12 @@
  * translates its responses into `ProviderEvent`s.
  */
 
-import type { Usage } from "@dispatch/wire";
+import type { ReasoningEffort, Usage } from "@dispatch/wire";
 import type { ChatMessage } from "./conversation.js";
 import type { Logger } from "./logging.js";
 import type { ToolContract } from "./tool.js";
 
-export type { Usage } from "@dispatch/wire";
+export type { ReasoningEffort, Usage } from "@dispatch/wire";
 
 /**
  * Events a provider yields during a single `stream` call. The kernel consumes
@@ -86,6 +86,14 @@ export interface ProviderStreamOptions {
 	/** System prompt to prepend. */
 	readonly systemPrompt?: string;
 	/**
+	 * Reasoning-effort level for this request (already RESOLVED by the caller —
+	 * the session-orchestrator applies the request → conversation → `"high"`
+	 * default chain, so a provider receiving `undefined` may treat it as "no
+	 * preference"). The provider maps the level to its native thinking knob in
+	 * its own code; providers without such a knob ignore it.
+	 */
+	readonly reasoningEffort?: ReasoningEffort;
+	/**
 	 * Correlated logger for this turn's step (Phase A logging ABI). When present,
 	 * the provider should open a child `provider.request` span and capture the
 	 * verbatim post-transform request + raw response/error there, self-redacting