[delaudio]

What changed

Implemented the complete native Rust MVP for deterministic end-to-end TUI testing:

• isolated Unix PTY process trees with bounded, retryable cleanup and normalized exits
• incremental VT screen model with styles, alternate screen, Unicode width, and combining marks
• portable keyboard expressions, text/paste input, live locators, assertions, and process expectations
• atomic deterministic snapshots with explicit update mode and readable diffs
• serial Rust runner and TOML CLI with filtering, reporter selection, bounded timeouts, and cleanup controls
• isolated Ratatui, Bubble Tea, and Textual fixtures
• macOS/Linux CI, internal-only test fixtures, and Rust-first documentation
• synchronized PTY/screen resizing and strict assertion-deadline handling

Root cause

The repository contained the product plan and issue catalogue but did not yet contain the Rust implementation or its validation workflow.

Validation

• cargo fmt --check
• cargo clippy --locked --all-targets --all-features -- -D warnings
• cargo test --locked — 85 unit tests and 3 CLI tests passed
• cargo test --locked --tests --features internal-test-fixture -- --test-threads=1 — 20 PTY integration tests passed; opt-in framework tests skipped locally
• cargo test --locked --doc — doc test passed
• assertion deadline regression passed 20 consecutive runs
• cargo check --locked --bin ttry
• Norn working-tree review with provider Codex passed after remediation (run-1786914621560750000)
• final branch review completed; its sole residual finding was verified as a false positive by successful binary compilation and was explicitly accepted before push
• follow-up Add deterministic coverage for default allow_running grace #61 tracks scheduler-independent coverage for the default allow_running grace race

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