Add os-adr evaluation harnesses (Eval A and Eval B)
Build comprehensive evaluation framework for the os-adr plugin (ADR-021).
Eval A: prompted skill-execution evaluation across haiku/sonnet models.
Six ADR lifecycle scenarios, deterministic Ruby checker, sandbox runner,
/autoresearch loop for wording optimization.
Eval B: held-out unprompted-behavior evaluation. Seven scenarios
(W1–W3 write-trigger, R1–R4 retrieval), webhook fixture with 6-ADR history
(Superseded pair + distractors), headless runner (isolated SessionStart
context), two-axis deterministic-first checker (consultation + citation
accuracy, AI judge fallback for new-file writes).
Both harnesses self-tested model-free. Grid runs deferred per locked
rollout order. Updated docs/specs to freeze scenario shapes and document
methodologies.
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