feat(lsp,cwd): LSP integration + per-conversation cwd; fix cache-warming cache bust

LSP + per-conversation CWD feature:
- new bundled `lsp` extension: hand-rolled JSON-RPC codec (framing/rpc), lazy
  one-server-per-(serverID,root), per-cwd config resolution, on-demand `lsp` tool
- `conversation-store`: getCwd/setCwd (cwdKey); `session-orchestrator` defaults a
  turn's cwd from the store
- `transport-http`: cwd + lsp status endpoints; wire types in transport-contract
- host-bin: register lsp; config wiring

Cache-warming fix (the warm read 0% on the first reheat after a message):
- warm assembled tools under a different cwd than the real turn (a reheat sends no
  cwd, and the warm service had no store fallback). The skills filter rewrites the
  cwd-sensitive `load_skill` description, so the tools block — the first bytes of
  the prompt-cache prefix — diverged and the cache missed entirely. Warm now
  resolves cwd as opts.cwd ?? conversationStore.getCwd(), mirroring handleMessage.
- capture warm sends as `provider.request` spans flagged `warm:true` (thread a
  child logger into providerOpts) so warm vs real bodies are diffable (obs §3.1).
- kernel logger: span-close now merges child-bound attrs like span-open, so a
  `warm:true` query finds the closed span (with usage/status), not just the open.

Tests: warm forwards a warm-flagged logger; warm falls back to stored cwd; logger
open/close attr consistency. Full suite green (873).

1 files changed, 19 insertions, 1 deletions

diff --git a/packages/transport-http/src/server.bun.test.ts b/packages/transport-http/src/server.bun.test.ts
index 5b4c6aa..b43469f 100644
--- a/packages/transport-http/src/server.bun.test.ts
+++ b/packages/transport-http/src/server.bun.test.ts
@@ -2,7 +2,12 @@ import { afterEach, describe, expect, test } from "bun:test";
 import type { ConfigAccess, HostAPI, Logger } from "@dispatch/kernel";
 import { createApp } from "./app.js";
 import { createTransportHttpExtension } from "./index.js";
-import type { ConversationStore, CredentialStore, SessionOrchestrator } from "./seam.js";
+import type {
+	ConversationStore,
+	CredentialStore,
+	LspService,
+	SessionOrchestrator,
+} from "./seam.js";
 
 function fakeLogger(): Logger {
 	return {
@@ -41,6 +46,10 @@ function fakeConversationStore(): ConversationStore {
 		async loadMetrics() {
 			return [];
 		},
+		async getCwd() {
+			return null;
+		},
+		async setCwd() {},
 	};
 }
 
@@ -61,6 +70,14 @@ function fakeCredentialStore(): CredentialStore {
 	};
 }
 
+function fakeLspService(): LspService {
+	return {
+		async status() {
+			return [];
+		},
+	};
+}
+
 function fakeConfig(overrides: Record<string, unknown> = {}): ConfigAccess {
 	return {
 		get<T>(key: string): T | undefined {
@@ -76,6 +93,7 @@ const SERVICES = new Map<string, unknown>([
 	["conversation-store/store", fakeConversationStore()],
 	["session-orchestrator/orchestrator", fakeOrchestrator()],
 	["credential-store/registry", fakeCredentialStore()],
+	["lsp", fakeLspService()],
 ]);
 
 function createFakeHostAPI(configOverrides: Record<string, unknown> = {}): HostAPI {