Merge remote-tracking branch 'origin/master' into codex/truncated-design

# Conflicts:
#	docs/capability-seams.md
#	docs/config-catalog.md
#	docs/cordis-catalog/services.md
#	docs/core-data-structures/core.md
#	docs/event-producer-consumer.md
#	docs/module-graph.md
#	docs/rfc/INDEX.md
#	docs/tool-catalog.md
#	examples/acp-agent/README.md
#	packages/README.md
#	packages/bash/bash/README.md
#	packages/core/tools/tests/gen-tool-catalog.spec.ts
#	packages/support/acp-snapshot/src/harness.ts
#	pnpm-lock.yaml
#	scripts/gen-doc-graphs.ts
#	scripts/gen-tool-catalog.ts
#	scripts/type-equiv.manifest.json

packages/bash/bash-local/src/index.ts

@@ -136,6 +136,10 @@ export class LocalBashExecutor extends BashExecutor {
       // Carry the owner through verbatim (required-but-nullable on the spec):
       // the executor never interprets it — the consumer's access policy does.
       owner: request.owner,
+      // Carry a sandbox-mode override through verbatim: this executor never
+      // confines, so the field is inert here (the seam contract) — a
+      // sandboxing subclass overrides resolve() to stamp its default instead.
+      sandboxMode: request.sandboxMode,
     }
   }
 
@@ -217,6 +221,18 @@ export class LocalBashExecutor extends BashExecutor {
     return this.tasks.get(id)
   }
 
+  /**
+   * Full collected stderr of a tracked task from stream start (bounded by the
+   * in-memory cap; bytes only in the spill file are not re-read). A protected
+   * seam for subclasses that classify a settled task's outcome — reading here
+   * does NOT advance the consumer's {@link readOutput} cursor. An unknown id
+   * (a task already dropped by disposal) reads as empty.
+   */
+  protected collectedStderr(id: BashTaskId): string {
+    const task = this.tasks.get(id)
+    return task === undefined ? '' : task.running.stderr.readFrom(0).text
+  }
+
   ownerOf(id: BashTaskId): OwnerToken | undefined {
     // Unknown id and known-but-ownerless both read as undefined — the consumer
     // treats undefined as "open" and a truly unknown id fails at readOutput/kill.