docs(bf-60pc): verify test environment and dependencies

notes/bf-60pc.md

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+# Bead bf-60pc: Test Environment Verification
+
+**Date:** 2026-07-02
+
+## Task Completed
+
+Verified that the Rust toolchain, cargo, and all test dependencies are properly installed and configured for the claude-print project.
+
+## Results
+
+### Toolchain Status
+- **cargo:** 1.95.0 (f2d3ce0bd 2026-03-21) ✓
+- **rustc:** 1.95.0 (59807616e 2026-04-14) ✓
+
+### Dependencies Status
+All dependencies in `Cargo.toml` are available and compile successfully:
+- clap 4.5.38 (derive, env features)
+- anyhow 1.0.98
+- serde 1.0.219 (derive feature)
+- serde_json 1.0.140
+- thiserror 2.0.12
+- toml 0.8.22
+- nix 0.29 (process, signal, fs, ioctl, term features)
+- tempfile 3.20
+- libc 0.2
+- atty 0.2
+- which 7.0
+
+### Build/Test Verification
+- `cargo check` passed without errors
+- `cargo test --no-run` completed successfully
+- All transitive dependencies resolved and compiled
+
+## Conclusion
+
+The test environment is fully functional. No missing system dependencies detected. All dependencies resolve correctly.
+
+## Notes
+
+Minor compiler warnings present (unused imports/variables) but these do not affect functionality or testing capability.