fix(sandbox): restore spawned workspace handoff (#44307)

Author: mcaxtr

CHANGELOG.md

@@ -144,6 +144,7 @@ Docs: https://docs.openclaw.ai
 - Gateway/session reset auth: split conversation `/new` and `/reset` handling away from the admin-only `sessions.reset` control-plane RPC so write-scoped gateway callers can no longer reach the privileged reset path through `agent`. Thanks @tdjackey for reporting.
 - Security/plugin runtime: stop unauthenticated plugin HTTP routes from inheriting synthetic admin gateway scopes when they call `runtime.subagent.*`, so admin-only methods like `sessions.delete` stay blocked without gateway auth.
 - Security/nodes: treat the `nodes` agent tool as owner-only fallback policy so non-owner senders cannot reach paired-node approval or invoke paths through the shared tool set.
+- Sandbox/sessions_spawn: restore real workspace handoff for read-only sandboxed sessions so spawned subagents mount the configured workspace at `/agent` instead of inheriting the sandbox copy. Related #40582.
 - Security/external content: treat whitespace-delimited `EXTERNAL UNTRUSTED CONTENT` boundary markers like underscore-delimited variants so prompt wrappers cannot bypass marker sanitization. (#35983) Thanks @urianpaul94.
 - Telegram/exec approvals: reject `/approve` commands aimed at other bots, keep deterministic approval prompts visible when tool-result delivery fails, and stop resolved exact IDs from matching other pending approvals by prefix. (#37233) Thanks @huntharo.
 - Subagents/authority: persist leaf vs orchestrator control scope at spawn time and route tool plus slash-command control through shared ownership checks, so leaf sessions cannot regain orchestration privileges after restore or flat-key lookups. Thanks @tdjackey.

src/agents/pi-embedded-runner/run/attempt.ts

@@ -1502,6 +1502,10 @@ export async function runEmbeddedAttempt(
           runId: params.runId,
           agentDir,
           workspaceDir: effectiveWorkspace,
+          // When sandboxing uses a copied workspace (`ro` or `none`), effectiveWorkspace points
+          // at the sandbox copy. Spawned subagents should inherit the real workspace instead.
+          spawnWorkspaceDir:
+            sandbox?.enabled && sandbox.workspaceAccess !== "rw" ? resolvedWorkspace : undefined,
           config: params.config,
           abortSignal: runAbortController.signal,
           modelProvider: params.model.provider,