Reorganize brain: projects/ top level, rename filenames, update homepage

- Moved everything from ideas/passepartout/ to projects/passepartout/
- Moved legal structures to projects/flags/
- Created missing _index.org files for all subdirectories
- Stripped redundant passepartout- prefix from filenames
- Rewrote root _index.org as generalized brain index (projects + concepts)
- Updated Hugo nav to Projects/Concepts
- Updated build script section descriptions
- Deleted stale ideas/passepartout-economics.md orphan

projects/passepartout/strategy/competitors/ai-agents-scoping/claude-code.org

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+:PROPERTIES:
+:ID:       512dd121-2292-4f3d-ac53-31bf3d12a60f
+:CREATED:  [2026-05-22 Thu]
+:END:
+#+title: Claude Code — Anthropic AI Coding Agent
+#+filetags: :passepartout:strategy:competitive:claude-code:
+
+Anthropic's proprietary coding agent. TypeScript/Bun, ~512K lines (leaked source analysis). Not open source.
+
+Architecture: Bun-bundled TypeScript single-file executable. Ink/React terminal UI. 23+ core tools. Subagent forking with byte-identical API prefixes for prompt cache sharing. Multi-agent coordination mode.
+
+Safety model: Layered deterministic safety — NOT prompt-based: 7 permission modes, persistent permission rules (alwaysAllow/alwaysDeny/alwaysAsk from 4 sources), bash security validator at 2,592 lines with 23+ named security checks using tree-sitter AST parsing, sandbox runtime, path/mode validation, optional ML bash classifier. This is the most sophisticated safety system of any coding agent analyzed.
+
+Data model: File-based markdown memdir at ~/.claude/projects/<slug>/memory/. 4 memory types: user, feedback, project, reference. YAML frontmatter in .md files. PROJECT.md and CLAUDE.md for project config. No database.
+
+Self-modification: HIGH. Skill system writes SKILL.md files. Plugin system, cron scheduling, agent spawning.
+
+Verification: None.
+
+Key gap vs Passepartout: No proof system, no neurosymbolic architecture, no self-verification, no persistent knowledge graph (flat markdown files, not Org-mode with cross-references), markdown data model lacks semantic depth. Proprietary — Anthropic controls it completely. The permission rules system is impressive but structurally inferior to Passepartout's gate stack because rules are heuristic (regex-based pattern matching) rather than typed (type-level gates with structural guarantees).
+
+See the full [[id:3aa22300-2f25-57b0-8787-9f199cc978b1][competitive analysis]] for the landscape view and comparison.