refactor(kernel): rename tabId → conversationId across contracts + consumers (218 tests)

Step 4 of the post-MVP backlog: resolve the last vocab drift. The canonical
term for a thread of turns is `conversationId` (GLOSSARY), but `AgentEvent`
variants and `RunTurnInput` still used the legacy `tabId` from the old frontend
"tab" concept, with session-orchestrator bridging `conversationId → tabId`.

Atomic, type-driven rename across the full 10-file consumer set:
- contracts/events.ts: all 11 AgentEvent variants tabId → conversationId
- contracts/runtime.ts: RunTurnInput.tabId → conversationId
- runtime/{events,run-turn,dispatch}.ts: factory params, ctx field, locals
- session-orchestrator: drop the redundant `tabId: conversationId` bridge line
- transport-http: emit wiring; external /chat field + X-Conversation-Id header
  unchanged (already canonical) — only the emitted NDJSON event field flips
- tests (run-turn, app, logic): inputs + assertions now use conversationId

Pure rename, zero behavior change: typecheck clean, 218 tests pass (unchanged
count), biome clean, `grep tabId packages/` → zero matches. Verified live:
multi-turn curl emits conversationId-keyed NDJSON and threads history correctly.
GLOSSARY drift note removed. Closes the post-MVP backlog (Steps 1–4).

1 files changed, 19 insertions, 19 deletions

diff --git a/packages/kernel/src/runtime/run-turn.test.ts b/packages/kernel/src/runtime/run-turn.test.ts
index 1ea6406..696a385 100644
--- a/packages/kernel/src/runtime/run-turn.test.ts
+++ b/packages/kernel/src/runtime/run-turn.test.ts
@@ -52,7 +52,7 @@ const userMessage: ChatMessage = {
 };
 
 describe("runTurn", () => {
-	it("emits events with the tabId and turnId from input", async () => {
+	it("emits events with the conversationId and turnId from input", async () => {
 		const provider = createFakeProvider([
 			[
 				{ type: "text-delta", delta: "hi" },
@@ -68,14 +68,14 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [],
 			dispatch: { maxConcurrent: 1, eager: false },
-			tabId: "conv-42",
+			conversationId: "conv-42",
 			turnId: "turn-99",
 			emit,
 		});
 
 		expect(events.length).toBeGreaterThan(0);
 		for (const event of events) {
-			expect(event.tabId).toBe("conv-42");
+			expect(event.conversationId).toBe("conv-42");
 			if (event.type !== "status") {
 				expect(event.turnId).toBe("turn-99");
 			}
@@ -100,7 +100,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [],
 			dispatch: { maxConcurrent: 1, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit,
 		});
@@ -143,7 +143,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [tool],
 			dispatch: { maxConcurrent: 1, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit,
 		});
@@ -201,7 +201,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [tool],
 			dispatch: { maxConcurrent: 1, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit: () => {},
 		});
@@ -250,7 +250,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [toolA, toolB],
 			dispatch: { maxConcurrent: 1, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit: () => {},
 		});
@@ -294,7 +294,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [toolA, toolB],
 			dispatch: { maxConcurrent: 2, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit: () => {},
 		});
@@ -352,7 +352,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [toolA, toolB, toolC],
 			dispatch: { maxConcurrent: 0, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit: () => {},
 		});
@@ -413,7 +413,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [tool],
 			dispatch: { maxConcurrent: 1, eager: true },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit: () => {},
 		});
@@ -464,7 +464,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [tool],
 			dispatch: { maxConcurrent: 1, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit: () => {},
 		});
@@ -513,7 +513,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [tool],
 			dispatch: { maxConcurrent: 1, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit,
 			signal: ac.signal,
@@ -545,7 +545,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [],
 			dispatch: { maxConcurrent: 1, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit: () => {},
 			signal: ac.signal,
@@ -583,7 +583,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [tool],
 			dispatch: { maxConcurrent: 1, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit,
 		});
@@ -657,7 +657,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [unsafeTool, safeTool],
 			dispatch: { maxConcurrent: 5, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit: () => {},
 		});
@@ -691,7 +691,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [],
 			dispatch: { maxConcurrent: 1, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit,
 		});
@@ -724,7 +724,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [],
 			dispatch: { maxConcurrent: 1, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit,
 		});
@@ -759,7 +759,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [tool],
 			dispatch: { maxConcurrent: 1, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit: () => {},
 		});
@@ -797,7 +797,7 @@ describe("runTurn", () => {
 			messages: [userMessage],
 			tools: [tool],
 			dispatch: { maxConcurrent: 1, eager: false },
-			tabId: "tab-test",
+			conversationId: "tab-test",
 			turnId: "turn-test",
 			emit,
 		});