chore: Add Claude Code memory system files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/memory/memory/MEMORY.md

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+# Project Memory Index
+
+- [Memory Saving Rules](memory_saving_rules.md) — How to save memories in this project

.claude/memory/memory/memory_saving_rules.md

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+---
+name: Memory Saving Rules
+description: Rules for saving and managing memories in this project
+type: feedback
+---
+
+## How to Save Memories
+
+Saving a memory is a two-step process:
+
+**Step 1** — Write the memory to its own file (e.g., `user_role.md`, `feedback_testing.md`) using this frontmatter format:
+
+```markdown
+---
+name: {{memory name}}
+description: {{one-line description — used to decide relevance in future conversations}}
+type: {{user, feedback, project, reference}}
+---
+
+{{memory content — for feedback/project types, structure as: rule/fact, then **Why:** and **How to apply:** lines}}
+```
+
+**Step 2** — Add a pointer to that file in `MEMORY.md`. `MEMORY.md` is an index — each entry should be one line, under ~150 characters: `- [Title](file.md) — one-line hook`.
+
+## Memory Types
+
+- **user**: Information about user's role, goals, preferences, and knowledge
+- **feedback**: Guidance on how to approach work — what to avoid and what to keep doing
+- **project**: Information about ongoing work, goals, initiatives, bugs, or incidents
+- **reference**: Pointers to where information can be found in external systems
+
+## What NOT to Save
+
+- Code patterns, conventions, architecture (read from code instead)
+- Git history (use `git log` / `git blame`)
+- Debugging solutions (the fix is in the code)
+- Anything already documented in CLAUDE.md files
+- Ephemeral task details
+
+**Why:** Memories should capture unique context not derivable from other sources.
+
+**How to apply:** Before saving, ask: "Is this information available elsewhere?" If yes, don't save as memory.

.claude/settings.json

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+{
+  "permissions": {
+    "allow": [
+      "Write(*.md)"
+    ]
+  }
+}