Fix the executable-resolution lifecycle contradiction to match the
shipped implementation: the executable resolves eagerly at load
(failing before registration if unavailable), while the server process
launch stays lazy until the first query. Align both language versions.
Correct two zh counterpart divergences: drop the "only" condition the
Chinese text added to the English "behave best" source modality, and
apply binding terminology (包（package）/包, transcript（文本记录）).
Lifecycle and safety fixes from the external review:
- Observe abort while awaiting the initialize handshake, so a server that never
replies can't defeat the tool-timeout signal.
- On an aborted request the server won't cancel, tear the instance down after a
bounded grace instead of releasing the serialized queue with work still live
(prevents overlapping document lifecycles).
- Re-check provider disposal after the canonicalize/read awaits so a query can't
spawn an unowned server after disposeAll().
- Read the source through one open handle (stat + read on the same fd) to close
the realpath-vs-read TOCTOU; decode with a fatal UTF-8 decoder so a legitimate
U+FFFD is not misclassified as invalid.
- Validate and read the source BEFORE spawning a server (pre-start rejection).
- Require an explicit openClose for option-form textDocumentSync.
- Reject nonpositive teardown budgets and non-executable absolute commands at
load; surface unsupported operations as structured LSP_UNSUPPORTED_OPERATION.
- Retain the stderr tail (fatal diagnostics land at exit), not the prefix.
- Catalog the seam vocabulary in docs/core-data-structures/lsp.md.
Implements the LSP capability seam RFC as three packages: dsh-lsp (the
ctx.lsp interface — provider registry by branded id + exclusive extension
mapping, per-query order-independent selection, closed request/result
vocabulary, LspError taxonomy), dsh-lsp-local (a generic stdio language-server
provider — Content-Length JSON-RPC framing, per-(provider, workspace) process
single-flight, transient didOpen/query/didClose, an abortable per-instance
queue, UTF-16 negotiation, host-namespace source reads outside ctx.fs, and
bounded shutdown/kill teardown), and dsh-tool-lsp (the model-facing lsp tool —
four operations, one-based UTF-16 cursor conversion, workspace-grouped location
rendering, hover capping, a required session workspace, and a timeout budget).
Why: an agent had text search and file reads but no way to identify a program
symbol — follow an alias, connect an interface to implementations, or read an
inferred type — before changing code. Splitting model contract, seam, and local
subprocess behavior keeps the four semantic queries stable across future remote
or sandbox-native providers without leaking a JSON-RPC escape hatch.
