chore(skills): apply the 2026-10-02 review -- current CLI and evidence, merges, removals, steering names

openultrasast-scan: evidence ladder as verification.py defines it, with the levels nothing produces today; --mode prerequisites, --fail-on, recorded degradations, run artifacts, ousast mcp; retired [evidence] threshold language removed. openultrasast-triage: reasons verified against calibration.py; deterministic fusion; adjudications as labels, plane verdicts as features, rule changes through improve or a registered experiment; fix-audit merged as a fix-and-re-scan section. kiro: spec-quick and spec-batch removed; validate-gap and validate-design merged into spec-design (--gap, --review; the review gate stays); steering-custom merged into steering; core steering names overview.md, roadmap.md, safety-net.md; instrument rule in debug and verify-completion; repo gates named in validate-impl. AGENTS.md, README skills paragraph and tests/test_agent_skills.py (.agents/skills, two product skills, drift tests) updated.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01EmM1j46qgKMh3zqD1QMwEo

.agents/skills/kiro-impl/SKILL.md

@@ -26,7 +26,7 @@ You operate in two modes:
 If steering/spec context is already available from conversation, skip redundant file reads.
 Otherwise, load all necessary context:
 - `.kiro/specs/{feature}/spec.json`, `requirements.md`, `design.md`, `tasks.md`
-- Core steering context: `product.md`, `tech.md`, `structure.md`
+- Core steering context: `overview.md`, `roadmap.md`, `safety-net.md` (custom steering files may also exist in `.kiro/steering/`)
 - Additional steering files only when directly relevant to the selected task's boundary, runtime prerequisites, integrations, domain rules, security/performance constraints, or team conventions that affect implementation or validation
 - Relevant local agent skills or playbooks only when they clearly match the task's host environment or use case; read the specific artifact(s) you need, not entire directories