Two paths bypassed the AST cache: LocalExecutorClient::execute (tests +
fallback) and the synchronous invoke() re-entry in the executor SDK.
The latter is the hot one — composed workflows multiplied parse cost
by depth, so a 4-deep invoke chain on a 200-line script paid the parse
budget × 4 per call.
Add a per-Engine HashMap<ScriptId, (updated_at, Arc<AST>)> + a
`compile_for_identity(script_id, updated_at, source)` helper that
behaves like LocalExecutorClient::get_or_compile but lives on the
Engine. Update the SDK invoke synchronous re-entry to:
resolved → compile_for_identity → execute_ast
The orchestrator-core LocalExecutorClient cache (HTTP-path dispatch)
is left untouched — it caches a different access pattern at a
different boundary.
AUDIT.md anchor: F-P-004.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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