A freestyle stage's tools are LLM-authored in the execution_plan. At run time an
unresolvable tool name is silently dropped (resolve -> null -> mapNotNull), so the
stage runs toolless — e.g. a misspelled task_update means the implementation stage
quietly loses task tracking, invisible without a live run.
ExecutionPlanCompiler now takes the registered-tool universe and rejects a plan that
names an unknown tool, with a message identifying the tool and stage. FreestyleDriver
already turns a compile failure into a rejection the architect retries. The param
defaults to empty (validation skipped) so existing callers are unaffected; Main feeds
it toolRegistry.all().
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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