feat(basic-memory): persistent knowledge base integration with research-informed operations

[wpfleger96]

Summary

Integrates basic-memory as a persistent, git-synced markdown knowledge base for AI coding agents. Knowledge persists across sessions, repos, and machines via git sync, and is browsable in Obsidian.

This PR has two layers:

Infrastructure — wires basic-memory into the ai-rules CLI and profile system:

• MCP server definition in personal and work profile mcp_overrides (not default)
• PostToolUse hook auto-commits and pushes after basic-memory write operations
• Runner script with background git sync (won't block MCP startup on slow networks)
• Idempotent setup script handles git init, GitHub remote creation, and directory scaffolding
• ToolSpec with is_enabled gating so upgrade skips basic-memory for profiles that don't use it
• CLI version, install, status, and upgrade all surface basic-memory

Operations — the /kb skill encodes proven patterns from Karpathy's llm-wiki, Block's world model ADR-182, and production case studies:

• Write-back loop — agents persist useful synthesized answers as notes, creating a compounding knowledge artifact
• GAP annotations ([GAP: ...]) — mark uncertain/unverified claims so agents surface uncertainty rather than hiding it (from squareup/world)
• Misconception tags ([misconception]) — document what is NOT true to prevent confident false assertions (from squareup/world "Counterfactual Warnings")
• Eval-first methodology — don't pre-populate speculatively; collect real agent failures, write targeted notes, verify improvement (from Block P2P world model +76% result)
• KB Lint — periodic health-check for stale GAPs, orphan notes, contradictions, version drift
• Schema promotion — [promote] tag flags patterns worth distilling into AGENTS.md rules

Files changed

Profiles — personal.yaml, work.yaml get basic-memory mcp_overrides
Hooks — basic-memory-runner.sh (background git sync), basic-memory-setup.sh (init order fix, remove --force), basic-memory-post-write.sh (unchanged, wired via settings.json)
CLI — cli.py gates status on config, respects is_enabled in upgrade loop
Installer — installer.py calls setup on upgrade, surfaces output on first install
Config — settings.json adds PostToolUse hook entry
Skill — SKILL.md adds GAP, misconception, write-back, eval-first, lint sections; note-templates.md adds misconception template
Docs — config/AGENTS.md expanded basic-memory section; repo AGENTS.md adds kb to skill list
Tests — 10 new tests for _is_basic_memory_configured, ensure_basic_memory_installed, is_enabled filtering