AET v1.9: evidence-driven quality plane

[AdvancingTitans]

Summary

• add normalized Evidence/Run/feedback ingestion and strict Task v2 observed scoring
• add deterministic quality diagnose / validation-only quality promote
• add reliability statistics, business-flow suites, commit-bound real-host release gate, and provenance checks
• reposition and rewrite the English/Chinese README with updated architecture and toolchain boundaries

Verification

• 175 tests + 353 subtests passed
• business flow: 68 tests + 237 subtests passed
• strict audit: 0 FAIL / 0 UNKNOWN
• package build and isolated wheel smoke passed

The final 6-pair real Codex host gate is intentionally run on the release commit after merge so its manifest can bind the exact tag commit.