Merge remote-tracking branch 'origin/master' into codex/rfc-subagent-background-tasks

Adopts #211 (Code Mode tools: run_code + the code/both-mode snapshot
scenarios). Tool-catalog expectations take the union (run_code +
task_*); the two new pinsHeader fixtures (code-mode-turn,
both-mode-turn) were recorded on master without the task runtime, so
they are re-pinned KEYLESSLY by replaying their recorded chunks against
the merged tree (same procedure as text-turn) — the fixture diff is
exactly the header delta: task tool schemas, the tool:tasks prompt
section, and the bash background wording.

pnpm-lock.yaml

@@ -353,13 +353,23 @@ importers:
         version: 4.0.0-rc.6(@cordisjs/plugin-include@1.0.4)(@cordisjs/plugin-loader@1.0.0-rc.4)
 
   packages/core/tools:
+    dependencies:
+      schemastery:
+        specifier: ^3.18.0
+        version: 3.18.0
     devDependencies:
       '@deepseek-ai/dsh-agent':
         specifier: workspace:^
         version: link:../agent
+      '@deepseek-ai/dsh-code-runtime':
+        specifier: workspace:^
+        version: link:../../code-runtime/code-runtime
       '@deepseek-ai/dsh-llm':
         specifier: workspace:^
         version: link:../../llm/llm
+      '@deepseek-ai/dsh-session':
+        specifier: workspace:^
+        version: link:../session
       '@deepseek-ai/dsh-system-prompt':
         specifier: workspace:^
         version: link:../system-prompt
@@ -1088,6 +1098,9 @@ importers:
       '@deepseek-ai/dsh-system-prompt':
         specifier: workspace:^
         version: link:../../core/system-prompt
+      '@deepseek-ai/dsh-tools':
+        specifier: workspace:^
+        version: link:../../core/tools
       '@deepseek-ai/dsh-user-interaction':
         specifier: workspace:^
         version: link:../user-interaction
@@ -1145,6 +1158,9 @@ importers:
       '@deepseek-ai/dsh-tool-ask-user':
         specifier: workspace:^
         version: link:../tool-ask-user
+      '@deepseek-ai/dsh-tools':
+        specifier: workspace:^
+        version: link:../../core/tools
       '@deepseek-ai/dsh-user-interaction':
         specifier: workspace:^
         version: link:../user-interaction