Add --no-estimate opt-out flag for plan use command and persist
EstimationSkipped reason when estimation is skipped or fails.
Add EstimationReport Pydantic domain model (identical to #649) with
spec-aligned multi-dimensional output: cost range (min/max USD),
expected steps, expected child plans, rollback risk (0.0-1.0),
estimated duration in minutes, confidence (0.0-1.0), rationale, and
optional historical basis.
Add EstimationSkipped domain model with reason, timestamp, and
optional actor_name fields for tracking when estimation is skipped
via --no-estimate or when the estimation actor fails.
Add estimation_produced to DecisionType enum and STRATEGIZE_TYPES.
Add Alembic migration m6_006 adding estimation_report_json and
estimation_skipped_json columns to v3_plans and updating the
ck_decisions_type CHECK constraint.
Wire --no-estimate through plan use CLI: when set, creates
EstimationSkipped with reason and clears the estimation actor.
Update _run_estimation() to persist EstimationSkipped on actor
failure instead of only logging.
Add docs/reference/estimation.md documenting the estimation feature,
EstimationReport schema, EstimationSkipped schema, and CLI examples.
Add benchmarks/estimation_actor_bench.py with ASV benchmarks for
EstimationReport and EstimationSkipped operations.
Add 13 Behave scenarios (estimation_skip.feature) and 6 Robot
integration tests (estimation_skip.robot) covering EstimationSkipped
model, EstimationReport model, plan field mutual exclusion, and
--no-estimate CLI behavior.
ISSUES CLOSED: #209
