feat: implement missing TUI commands and fix TTY check

[laynepenney]

No description provided.

[laynepenney]

Thorough PR Review

Summary

Reviewed PR #274 implementing missing TUI commands and fixing TTY check bug.

Changes Reviewed

1. TTY Check Fix (src/tui/mod.rs:65-72)

• Uses IsTerminal trait from std::io
• Checks both stdin AND stdout for terminals
• Clear error message provided

2. /compact summarize

• Calls agent.compact_context() properly
• Handles edge cases: no agent, insufficient messages, already summarized
• Clear status feedback

3. /model switching

• Validates: anthropic, claude, openai, gpt, ollama
• Updates config correctly
• Shows feedback message

4. /models listing

• 11 models across 3 providers
• Shows provider availability
• Displays model details and capabilities

Test Results

• All 511 unit tests pass
• 32 integration tests pass
• 6 TUI tests pass
• 1 doc-test passes

Verifications

• Code compiles without warnings
• No new dependencies
• Follows existing code style
• No TODOs in implementation
• Edge cases handled

Review Conclusion: APPROVED - Ready to merge