refactor: modularize CLAUDE.md into ~/.claude/rules/ with agent-team content separation

- Split monolithic CLAUDE.md into 7 focused rule files in rules/
- Remove agent-team specific content from global rules (subagent cost,
  model defaults, tier shortcuts) — already covered by orchestrate skill
- Add "prefer summaries over verbatim output" to orchestrate Step 8
- Update install.sh to symlink rules/ directory
- Trim CLAUDE.md to a minimal pointer since rules auto-load

rules/04-tools.md

@@ -0,0 +1,17 @@
+# Tool & Approach Philosophy
+
+- Prefer tools and solutions that are declarative and reproducible over imperative one-offs
+- Portability across dev environments is a first-class concern — avoid hardcoding machine-specific paths or assumptions
+- The right tool for the job is the right tool — no language/framework bias, but favor things that can be version-pinned and reproduced
+
+# Parallelism
+
+- Always parallelize independent work — tool calls, file reads, searches
+- When a task has components that don't depend on each other, run them concurrently by default
+- Sequential execution should be the exception, not the default
+
+# Context Management
+
+- Use subagents for exploratory reads and investigations to keep the main context clean
+- Prefer scoped file reads (offset/limit) over reading entire large files
+- When a task is complete or the topic shifts significantly, suggest /clear