Turn TraceRecorder into a lightweight trace event entry point and move
file persistence responsibilities into the default FileTraceSink. Trace
events are now published through TraceSinkRegistry, allowing additional
runtime observers to subscribe without parsing trace files.
Add TraceSink and TraceSinkRegistry, keep FileTraceSink registered as the
default sink, and preserve the existing active/historical/archived trace
file rotation behavior inside the file sink.
Also change TraceEvent to carry a logical key instead of a caller-provided
path, so trace storage locations are resolved internally under the traceroot. Update existing trace producers to emit logical keys such ascontext-workspace, exception, and advice targets.
Use a stage-local Phaser in ActionExecutor so each action-chain stage
waits on its own execution phase. This avoids reusing a terminated
Phaser after the first stage completes, which could cause later stages
to advance without actually waiting for their MetaActions and trigger
FINAL_CHECK prematurely.
Add stage-level descriptions to evaluated action chains and pass them
through execution/correction contexts. Stage descriptions are now aligned
with normalized action-chain order, exposed to ParamsExtractor, persisted
in action state, and included in CorrectorInput so repeated MetaActions
can be parameterized and corrected according to their concrete stage
objective.
Also fix APPEND intervention semantics to append after the requested
stage instead of overwriting or dropping stages, and include stage
descriptions in correction prompts to distinguish stage intent from
generic MetaAction capability descriptions.
