moai-harness-learner <!-- @MX:NOTE: [AUTO] V3R4 contract — this skill body is preserved unchanged per SPEC-V3R4-HARNESS-001 §10 exclusion #10 (text annotation only, no behavioral change). The 4-tier observation/heuristic/rule/auto update ladder defined here is preserved verbatim under REQ-HRN-FND-011. The orchestrator-only AskUserQuestion contract is asserted by REQ-HRN-FND-015 (cross-reference: .claude/rules/moai/core/agent-common-protocol.md § User Interaction Boundary). The downstream replacement of the frequency-count classifier with an embedding-cluster algorithm is deferred to SPEC-V3R4…