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, 5 insertions, 0 deletions

diff --git a/GLOSSARY.md b/GLOSSARY.md
index 259dc27..63b7ea8 100644
--- a/GLOSSARY.md
+++ b/GLOSSARY.md
@@ -46,6 +46,11 @@
 | **skill** | A reusable instruction document (markdown) under a `.skills/` directory, loaded on demand into the conversation by the `load_skill` tool. Discovered from `~/.skills` (home) and `<cwd>/.skills` (project); on a name clash the cwd skill shadows the home one. A skill's name is its filename without `.md`. | prompt snippet, macro |
 | **skill summary** | A skill file's "when to use this skill" line: line 1 of the md, valid only when line 2 is exactly `---`. Advertised (per-turn, cwd-aware) in the `load_skill` tool's description; on load the first two lines are stripped. A file lacking the `---` delimiter shows no summary but stays loadable. | — |
 | **tools filter** | The per-turn `FilterDescriptor` (`toolsFilter`, owned by `session-orchestrator`) through which extensions transform a turn's tool set before it reaches `runTurn`. Applied ONCE per turn so the tool definitions stay byte-stable across steps (prompt-cache safe). The first concrete use of the §3.2 context-assembly filter chain. | — |
+| **LSP** | Language Server Protocol — the JSON-RPC-over-stdio (`Content-Length`-framed) protocol a `language server` speaks. Used as the adjective for the feature (the `lsp` extension, the `lsp` tool). | — |
+| **language server** | A long-lived child process speaking `LSP` over stdio that provides `diagnostics`, hover, definition, references, and symbols for files in a `workspace root`. Spawned lazily, one process per `(serverID, workspaceRoot)`, from a config-resolved definition (command + extensions + root markers + initialization). | LSP server (as the process), lang server |
+| **diagnostics** | The errors/warnings/hints a `language server` reports for a file — received both push (`textDocument/publishDiagnostics`) and pull (`textDocument/diagnostic`), then merged + deduped. | lints (when meaning LSP diagnostics) |
+| **workspace root** | The directory a `language server` is rooted at (its `rootUri` and spawn cwd): the nearest root-marker ancestor of a file, bounded above by the conversation's `working directory`. | project root (when meaning the per-server root) |
+| **working directory** | The per-conversation filesystem directory that tools and `language server`s operate within (`ToolExecuteContext.cwd`). Persisted per conversation by `conversation-store`; gettable/settable via the cwd endpoint; defaults a turn's cwd when `/chat` omits it. | cwd (spell out on first use), workdir (when meaning the conversation's directory) |
 
 ## Known vocabulary drift