Merge origin/master: Code Mode composed with agent scopes

Master advanced 11 commits mid-merge (the Code Mode registry integration:
mode config, run_code, the tools:sdk section, the ACP run_code cards and
unified demos). The fusion makes Code Mode scope-aware end to end:

- wireSchemas(scope): the mode-aware wire contribution is computed from the
  CALLING SCOPE's visible set (scoped tools join, shadowing and restrictions
  apply) and feeds the {schemas, knownNames} provider protocol.
- knownNames under the mode collapse: a per-scope RESTRICTION is runtime
  state, so the universe stays pre-restriction (a restricted-away tool in
  toolOrder is a normal absence) — but the MODE collapse is deployment
  config, so under mode 'code' the universe is [run_code] and a toolOrder
  naming a native tool fails every assembly loud (master's tested decision,
  kept).
- The tools:sdk section renders per assembly CONTEXT: the SDK declares
  exactly the calling agent's callable set, using the section-text provider
  signature this branch already had.
- run_code bindings enumerate schemas(exec.agent) — a program can bind
  exactly what its prompt promised; sub-dispatches already threaded
  exec.agent through registry.execute, so scoped resolution and carriers
  flow unchanged.
- dsh-tools declares both sides' new deps (dsh-scope + dsh-session);
  lockfile and all generated catalogs/graphs/api-catalog regenerated.

Gates green on the merged tree: typecheck, lint, per-file 100% coverage
(2710 tests), snapshots (41), doc-sync, module graph, build, hygiene, demo
smoke.

packages/core/tools/package.json

@@ -23,15 +23,22 @@
   "license": "BSD-3-Clause",
   "peerDependencies": {
     "@deepseek-ai/dsh-agent": "^0.0.1",
+    "@deepseek-ai/dsh-code-runtime": "^0.0.1",
     "@deepseek-ai/dsh-llm": "^0.0.1",
     "@deepseek-ai/dsh-scope": "^0.0.1",
+    "@deepseek-ai/dsh-session": "^0.0.1",
     "@deepseek-ai/dsh-system-prompt": "^0.0.1",
     "cordis": "^4.0.0-rc.6"
   },
+  "dependencies": {
+    "schemastery": "^3.18.0"
+  },
   "devDependencies": {
     "@deepseek-ai/dsh-agent": "workspace:^",
+    "@deepseek-ai/dsh-code-runtime": "workspace:^",
     "@deepseek-ai/dsh-llm": "workspace:^",
     "@deepseek-ai/dsh-scope": "workspace:^",
+    "@deepseek-ai/dsh-session": "workspace:^",
     "@deepseek-ai/dsh-system-prompt": "workspace:^",
     "cordis": "^4.0.0-rc.6"
   }