v0.4.0 — Russian wiki standardized + lint tooling

Highlights

• wiki-ru/ — Full enhancement pass: schema-aligned frontmatter, [[ru/...]] links, inline sources, allowlist tags, reviewed, no spurious body # / --- where applicable. Mechanical lint is clean for wiki-ru/ (python3 tools/lint.py --layer ru).
• tools/lint.py — New stdlib-only linter for wiki-en/ and wiki-ru/ (wikilinks, sources: shape, tags, body rules, etc.); supports --write-report, strict exit codes.
• Docs — CLAUDE.md, README.md, docs/WIKI-GUIDE.md updated for lint workflow; docs/lint-report.md is the generated English report (scope = last --write-report run).

Notes

• wiki-en/ is not fully brought to the same bar yet; --layer both will still surface EN findings until a future milestone.
• Human review still covers orphans, index.md coverage, and content parity (see lint report “Suggested follow-ups”).