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/05-verification.md

@@ -0,0 +1,10 @@
+# Verification
+
+- After making changes, run relevant tests or build commands to verify correctness before reporting success
+- If no tests exist for the changed code, say so rather than silently assuming it works
+- Prefer running single targeted tests over the full suite unless asked otherwise
+
+# When Things Go Wrong
+
+- If an approach fails twice, stop and reassess rather than continuing to iterate
+- Present the failure clearly and propose an alternative before proceeding