feat(FN-2617): merge fusion/fn-2617 (auto-resolved)

- test(FN-2617): stabilize workflow remediation timeout under full suite
- test(FN-2617): complete Step 5 — add openclaw runtime resolution coverage
- feat(FN-2617): complete Step 4 — route step sessions through runtime resolution
- fix(FN-2617): thread runtimeHint through merger rebase push flow
- feat(FN-2617): complete Step 3 — wire runtimeHint across engine subsystems
- feat(FN-2617): complete Step 2 — thread runtimeHint in executor paths
- feat(FN-2617): complete Step 1 — add runtimeHint extraction helper

packages/engine/src/runtimes/in-process-runtime.ts

@@ -256,6 +256,7 @@ export class InProcessRuntime
               : undefined,
             rootDir: this.config.workingDirectory,
             pluginRunner: this.pluginRunner,
+            agentStore: this.agentStore,
           })
         : undefined;