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Implements docs/todo/validator-loop-until-dry-skill-design.md. Pure Skill + Agent-definition wiring, no execution-engine changes -- the convergence loop runs inside a single Work Node's one claude -p session (multi-turn tool use), not a graph_manifest-level cycle, so topological_layers()/ run_graph() are untouched. New Skill skills/unknown-scope-defect-sweep/SKILL.md: K=2 consecutive no-new-finding rounds to stop, 20-round hard cap, dedup key must be a structural identifier (file path + line, route path, package name) not a natural-language description (the same finding gets reworded call to call, so text-keyed dedup never converges), dedup set is "everything ever seen" not "everything confirmed" (the common bug the 14-step reference names: a rejected candidate reappearing as a false "new finding" every round). Each candidate is verified via qa-task-validation's existing PASS/FAIL/INCONCLUSIVE framework -- deliberately NOT root_cause_trace's three-perspective jury (F), since that answers a different question (root cause AFTER a failure) from this one (is this candidate real at all) -- documented in the design doc's own tradeoff note. Wired into agent_profile.py's FRONTMATTER["validator"]["skills"] and agents/validator/AGENTS.md's "必须加载" section with a concrete trigger signal (task description can't state an exact expected count/boundary up front). Only FR-4 (Skill wired into the rendered .claude/agents/validator.md) has deterministic, mockable behavior -- new test test_validator_references_unknown_scope_defect_sweep_skill. Acceptance criteria 1-3 (actually finds everything, actually dedups correctly, actually stops at the hard cap) need real multi-turn claude -p behavior, out of scope for mocked tests (RUN_REAL_AGENT_E2E=1 territory), same category of limitation as F's own real-concurrency-timing note. Full src suite (587 tests) passes with zero regressions. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
