fix(lsp): gate LSP endpoint on persisted cwd; accept workspaceId on PUT cwd

GET /conversations/:id/lsp was calling getEffectiveCwd directly, which falls
through to serverDefaultCwd (process.cwd()) when no conversation cwd is set.
Now gates on getCwd first: returns {cwd:null, servers:[]} when no cwd
persisted; only resolves via getEffectiveCwd + calls lspService.status when
a persisted cwd exists.

PUT /conversations/:id/cwd now accepts optional workspaceId — validates with
isValidWorkspaceSlug, then ensureWorkspace → setWorkspaceId → setCwd (assigns
the workspace before persisting cwd, so getEffectiveCwd resolves relative
cwds against the workspace defaultCwd, not the server default).

transport-contract 0.16.0→0.17.0 (additive SetCwdRequest.workspaceId;
LspStatusResponse.cwd comment updated).

1332 vitest pass.

0 files changed, 0 insertions, 0 deletions