v0.3.0 — Agent Rulebook Overhaul + Docs Reorganisation

Agent configuration

• CLAUDE.md completely rewritten: now a tight, project-specific rulebook
  with a directory map, numbered operation checklists (Ingest / Enhance / Lint / Query),
  wikilink discipline table, and a "What agents must NOT do" section at the top.
  Generic LLM-wiki boilerplate removed.
• New rule: No # heading in page body — Quartz uses frontmatter title.
• New rule: sources: field standardised to inline array format.
• PAGE-ENHANCEMENT-STANDARD.md critical fix: the old "keep one # heading for SEO"
  instruction (which contradicted Quartz rendering) is now corrected.

Docs reorganisation

• All maintenance docs moved from repo root → docs/:
  WIKI-GUIDE.md, PAGE-ENHANCEMENT-STANDARD.md, WIKI-BACKLOG.md,
  log.md, lint-report.md
• GEMINI.md removed (redundant with CLAUDE.md)
• WIKI-GUIDE.md and README.md now include an agent prompt patterns table
  (Ingest / Enhance / Lint / Query with example prompts)
• WIKI-BACKLOG.md populated with ~35 uncovered raw/ slugs and EN/RU inconsistency flags

Wiki content

• Full enhancement pass on all 12 wiki-ru/entities pages
• Partial enhancement pass on 5 wiki-ru/concepts pages (security, segwit, taproot, third-parties, utxo)