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, 29 insertions, 0 deletions

diff --git a/packages/lsp/src/index.ts b/packages/lsp/src/index.ts
new file mode 100644
index 0000000..19f824b
--- /dev/null
+++ b/packages/lsp/src/index.ts
@@ -0,0 +1,29 @@
+export type {
+	ClientDeps,
+	FileWatcher,
+	FileWatcherHandle,
+	FsAccess,
+	SpawnedProcess,
+	SpawnProcess,
+} from "./client.js";
+export { LanguageServerClient } from "./client.js";
+export type { LspJsonConfig, OpencodeJsonConfig, ResolvedServer, ServerConfig } from "./config.js";
+export { resolveServers } from "./config.js";
+export type {
+	Diagnostic,
+	DocumentDiagnosticReport,
+	PublishDiagnosticsParams,
+} from "./diagnostics.js";
+export { DiagnosticsStore } from "./diagnostics.js";
+export { extension, lspServiceHandle } from "./extension.js";
+export { encode, FrameDecoder } from "./framing.js";
+export { languageId } from "./language.js";
+export type { Logger, ManagerDeps } from "./manager.js";
+export { LspManager } from "./manager.js";
+export { findRoot } from "./root.js";
+export type { JsonRpcMessage, NotificationHandler, RequestHandler, WriteFn } from "./rpc.js";
+export { JsonRpcConnection } from "./rpc.js";
+export { createLspTool } from "./tool.js";
+export type { LspServerState, LspServerStatus, LspService } from "./types.js";
+export type { FileChangeTypeValue, FileSystemWatcher, Registration } from "./watched-files.js";
+export { FileChangeType, globMatch, WatchedFilesRegistry } from "./watched-files.js";