fix: Replace .expect() panics with error propagation

[2witstudios]

Summary

• Changed print_response() from returning () to Result<(), CliError>, replacing .expect() calls with ? operator
• Fixed 4 .expect() panic sites in output.rs, prompt.rs, and grid.rs that could crash the CLI on JSON serialization failure
• Updated all 25+ callers across 14 command files to propagate errors through the existing CliError::Json variant

Test plan

• cargo build — clean compilation
• cargo test — all 312 tests pass (70 CLI + 231 core + 11 engine)
• cargo clippy --all-targets — zero warnings
• cargo fmt --all — formatting verified

🤖 Generated with Claude Code

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5f14b03f-daf2-47d5-8573-677bfd270e86

📥 Commits

Reviewing files that changed from the base of the PR and between 55aa882 and 534fe75.

📒 Files selected for processing (14)

• crates/pu-cli/src/commands/agent_def.rs
• crates/pu-cli/src/commands/attach.rs
• crates/pu-cli/src/commands/clean.rs
• crates/pu-cli/src/commands/diff.rs
• crates/pu-cli/src/commands/grid.rs
• crates/pu-cli/src/commands/health.rs
• crates/pu-cli/src/commands/kill.rs
• crates/pu-cli/src/commands/logs.rs
• crates/pu-cli/src/commands/prompt.rs
• crates/pu-cli/src/commands/schedule.rs
• crates/pu-cli/src/commands/spawn.rs
• crates/pu-cli/src/commands/status.rs
• crates/pu-cli/src/commands/swarm.rs
• crates/pu-cli/src/output.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch pu/improve-2

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[2witstudios]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

🤖 Generated with Claude Code