Merge remote-tracking branch 'origin/codex/package-readme-limitations-audit-20260712' into codex/model-experience-readmes-20260712

# Conflicts:
#	docs/cookbook/adding-a-package.md
#	docs/rfc/INDEX.md
#	package.json
#	packages/AGENTS.md
#	packages/bash/bash-sandbox/README.md
#	packages/sandbox/sandbox-local/README.md
#	packages/sandbox/sandbox/README.md
#	packages/session-persistence/session-persistence-sqlite/README.md
#	packages/support/acp-snapshot/README.md
#	packages/ui/app-boot/README.md
#	packages/ui/user-approval/README.md
#	packages/workflow/tool-workflow/README.md

packages/subagent/subagent-spawn/README.md

@@ -24,3 +24,8 @@ The run mechanics live in the shared [`@deepseek-ai/dsh-subagent-inprocess`](../
 | Key | Meaning |
 |---|---|
 | `providerName` | Registry name on `ctx.subagents` (default `spawn`). |
+
+## Known Limitations and Deferred Work
+
+- **Runs expose no `sendMessage`/`resume`** — the optional runtime capabilities are absent on in-process runs; the consumer collects synchronously.
+- **Fresh means no parent transcript** — the child inherits cwd, lineage, model, and explicitly configured persona/tool restrictions, but none of the parent's conversation; use the fork provider when completed-turn context is required.