docs: second-pass wiki audit fixes
- Fix Browser-Tool.md example version (0.41.3 → 0.44.0)
- Fix Security-Policy.md supported version (0.38.x → 0.44.x)
- Fix 5 plugin pages outdated docs/ GitHub links → wiki page links
- Fix 33 MediaWiki [[...]] links → standard GitHub wiki markdown in 11 pages
- Add 12 missing CLI commands to CLI-Reference.md (start, stop, a2a, agentlint, marketplace, mcp-gateway, memori, migrate, sessions, tui, install, uninstall)
docs: full wiki refresh for v0.44.0
- Update version to v0.44.0, tool count to 60 (was 43)
- Add 16 missing source directories to Architecture.md (a2a, hub, memori, mcp-gateway, eval, update, projects, desktop, services, IPC, config, db, PKM, prompt lab)
- Expand Database-Migrations.md from 21 to 33 migrations (022-033)
- Expand Channel-Adapter-API.md from 1 to 13 channels with shared infrastructure docs
- Fix stale factory.ts references in Contributing.md and Adding-an-LLM-Provider.md
- Add Advanced Plugin Features section (dependency guardian, supply chain, UI slots, WASM, namespace)
- Add 11 new wiki pages: A2A Protocol, MCP Gateway, Distributed Nodes, Memori Checkpoints, Eval System, Glossary, Update System, Projects, TUI, Triggers, Workflow Engine
- Update _Sidebar.md with new Advanced Features section