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, 12 insertions, 1 deletions

diff --git a/bun.lock b/bun.lock
index 9b63971..f98aa26 100644
--- a/bun.lock
+++ b/bun.lock
@@ -60,6 +60,7 @@
         "@dispatch/credential-store": "workspace:*",
         "@dispatch/journal-sink": "workspace:*",
         "@dispatch/kernel": "workspace:*",
+        "@dispatch/lsp": "workspace:*",
         "@dispatch/provider-openai-compat": "workspace:*",
         "@dispatch/session-orchestrator": "workspace:*",
         "@dispatch/skills": "workspace:*",
@@ -89,6 +90,13 @@
         "@dispatch/wire": "workspace:*",
       },
     },
+    "packages/lsp": {
+      "name": "@dispatch/lsp",
+      "version": "0.0.0",
+      "dependencies": {
+        "@dispatch/kernel": "workspace:*",
+      },
+    },
     "packages/observability-collector": {
       "name": "@dispatch/observability-collector",
       "version": "0.0.0",
@@ -194,7 +202,7 @@
     },
     "packages/transport-contract": {
       "name": "@dispatch/transport-contract",
-      "version": "0.4.0",
+      "version": "0.5.0",
       "dependencies": {
         "@dispatch/ui-contract": "workspace:*",
         "@dispatch/wire": "workspace:*",
@@ -207,6 +215,7 @@
         "@dispatch/conversation-store": "workspace:*",
         "@dispatch/credential-store": "workspace:*",
         "@dispatch/kernel": "workspace:*",
+        "@dispatch/lsp": "workspace:*",
         "@dispatch/session-orchestrator": "workspace:*",
         "@dispatch/throughput-store": "workspace:*",
         "@dispatch/transport-contract": "workspace:*",
@@ -268,6 +277,8 @@
 
     "@dispatch/kernel": ["@dispatch/kernel@workspace:packages/kernel"],
 
+    "@dispatch/lsp": ["@dispatch/lsp@workspace:packages/lsp"],
+
     "@dispatch/observability-collector": ["@dispatch/observability-collector@workspace:packages/observability-collector"],
 
     "@dispatch/provider-openai-compat": ["@dispatch/provider-openai-compat@workspace:packages/provider-openai-compat"],