- New `ScriptIdentity { script_id, updated_at }` DTO.
- `ExecutorClient` trait gains an `execute_with_identity` method;
default impl forwards to `execute` so `RemoteExecutorClient` (and
cluster-mode transports later) keep working without bespoke caching.
- `LocalExecutorClient` overrides `execute_with_identity` to consult
an `LruCache<ScriptId, CachedScript>`. Cache hit only when the
cached entry's `updated_at` matches the caller's identity; mismatch
triggers a fresh `Engine::compile`. `Engine::execute_ast(&Arc<AST>, req)`
is called inside `spawn_blocking` exactly as `execute` does today.
- Cache size from `PICLOUD_SCRIPT_CACHE_SIZE` (default 256).
- Orchestrator's HTTP data-plane path and the dispatcher both switch
to `execute_with_identity`. `ResolvedTrigger` carries
`script_updated_at` for the dispatcher's identity construction.
Workspace builds; full test suite (~440 tests) green.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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