feat: add executor parity safeguards (#2704)

docs/decisions/INDEX.md

@@ -92,6 +92,8 @@ Read individual ADRs for full context. Create new ones via `/record decision` or
 | 2026-07-28-visible-wip-overflow-queues | [Separate Visible Queueing From WIP Admission](2026-07-28-visible-wip-overflow-queues.md) | proposed | backend, frontend, protocol, workflow | 2026-07-28 |
 | 2026-08-12-queue-task-moves-at-wip-capacity | [Queue Task Moves at WIP Capacity](2026-08-12-queue-task-moves-at-wip-capacity.md) | accepted | backend, frontend, protocol, workflow | 2026-08-12 |
 | 2026-08-15-subagent-context-schema-boundary | [Start with the execution-aware subagent schema](2026-08-15-subagent-context-schema-boundary.md) | accepted | backend | 2026-08-15 |
+| 2026-08-15-portable-agent-configuration-bundles | [Use Explicit Portable Agent Configuration Bundles](2026-08-15-portable-agent-configuration-bundles.md) | accepted | backend, frontend, protocol, security | 2026-08-15 |
+| 2026-08-15-executor-authoritative-model-selection | [Let the Executor Own Model Selection](2026-08-15-executor-authoritative-model-selection.md) | accepted | backend, frontend, protocol, persistence | 2026-08-15 |
 | 2026-07-28-coarse-running-busy-signal | [Restore Coarse Running Prompt Admission](2026-07-28-coarse-running-busy-signal.md) | accepted | backend, frontend, protocol | 2026-07-28 |
 | 2026-07-29-agent-stall-user-controlled-recovery | [Keep Agent Stall Recovery User Controlled](2026-07-29-agent-stall-user-controlled-recovery.md) | accepted | backend, frontend, protocol | 2026-07-29 |
 | 2026-07-29-quarantine-retention-override | [Make Quarantine Retention Overridable but Visible](2026-07-29-quarantine-retention-override.md) | accepted | backend, frontend | 2026-07-29 |