Merge remote-tracking branch 'origin/master' into feat/plan-mode

Master arrivals re-grafted onto the plan-mode surfaces:
- Package invariant runtime contracts: every package owns ./invariant —
  added the dsh-mode companion (mode/set payload validation: non-empty
  trimmed name), its unit spec, exports/peer wiring, and the mode group in
  the tsconfig invariant paths glob.
- Interception waterfalls gained an AbortSignal parameter
  (agent/prompt-submit, agent/turn-continuation) and ToolExecutionInput.signal
  became required: listeners and test dispatch updated; the exit tool now
  forwards exec.signal unconditionally.
- TUI question dialog: master's position/unanswered header layout kept,
  the plan-review detail block re-grafted between question and answers.
- LSP capability family arrived: lsp tool joins the catalog pin, dsh-lsp
  examples deps beside dsh-mode; lsp-definition snapshot refreshed with
  the mode command and modes advertisement.
- docs/architecture.md and packages/README.md regenerated tables re-grafted
  (ctx.modes row, mode package row) and condensed within word ceilings.
- examples/acp-agent cordis.yml: kept the deployment-owned plan instructions
  (incl. the conversational-agreement sentence) beside master's routed-model
  compaction comment; snapshot expected outputs refreshed keyless and noise
  fixtures restored.

examples/package.json

@@ -27,6 +27,8 @@
     "@deepseek-ai/dsh-llm": "workspace:*",
     "@deepseek-ai/dsh-llm-deepseek": "workspace:*",
     "@deepseek-ai/dsh-llm-replay": "workspace:*",
+    "@deepseek-ai/dsh-lsp": "workspace:*",
+    "@deepseek-ai/dsh-lsp-local": "workspace:*",
     "@deepseek-ai/dsh-mode": "workspace:*",
     "@deepseek-ai/dsh-permission": "workspace:*",
     "@deepseek-ai/dsh-repeat-tool-guard": "workspace:*",
@@ -37,6 +39,7 @@
     "@deepseek-ai/dsh-spill-policy": "workspace:*",
     "@deepseek-ai/dsh-tui-demo": "workspace:*",
     "@deepseek-ai/dsh-subagent": "workspace:*",
+    "@deepseek-ai/dsh-subagent-acp": "workspace:*",
     "@deepseek-ai/dsh-subagent-fork": "workspace:*",
     "@deepseek-ai/dsh-subagent-spawn": "workspace:*",
     "@deepseek-ai/dsh-time-context": "workspace:*",
@@ -47,6 +50,7 @@
     "@deepseek-ai/dsh-tool-fs": "workspace:*",
     "@deepseek-ai/dsh-tool-fs-search": "workspace:*",
     "@deepseek-ai/dsh-tool-goal": "workspace:*",
+    "@deepseek-ai/dsh-tool-lsp": "workspace:*",
     "@deepseek-ai/dsh-tool-ralph": "workspace:*",
     "@deepseek-ai/dsh-tool-subagent": "workspace:*",
     "@deepseek-ai/dsh-tool-todo": "workspace:*",