[P1] Decide verified/ semantics — directory vs badge

[Ikalus1988]

Problem

The search engine has verified_boost based on ## Verify/Verification sections, but there's also a verified/ directory concept. These are not aligned.

Options

A. Badge only: verified = lesson has ## Verification section. No directory.
B. Directory: verified/ is a physical directory for curated lessons. Search/lessons.json/OKF/MCP all index it.
C. Hybrid: badge determines weight, directory determines inclusion in curated collections.

Acceptance Criteria

• Decision documented in docs/verified-semantics.md
• Search engine behavior matches decision
• lessons.json includes verified lessons
• MCP server returns verified badge in results

Why

Unifying verified semantics improves search quality and contributor understanding.

Difficulty

🟡 Ring-2 — design decision + implementation.

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