Add SCAN_AHEAD_LIMIT (10000 lines) to get_line() in Sampling state. Without this, jumping to end-of-file (G) during progressive loading would scan the entire file byte-by-byte on the main thread, blocking the UI and consuming excessive memory. Lines beyond the scanned region + limit now return None, which the TUI renders as empty.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Complete FileWatcher implementation using notify 8.x crate with get_inode() for cross-platform file identity. Support append detection for incremental index updates and truncate detection for full reloads.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Add ProgressiveFileReader state machine (Sampling/Ready/Error) with scanned_newlines cache for O(1) line lookups. Implement spawn_indexer() for background mmap-based indexing with cancellation and progress reporting. Add VisualHeightIndex with prefix-sum + binary search for O(log N) visual height queries. Register all new io submodules and extend FileReader with reload(), save_cache(), and accessor methods.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Move wrap_line_chars and format_json_line from app.rs to core/io/wrap.rs with MAX_WRAP_INPUT_LEN guard. Add serde derives, pub getters, and extend_from_bytes() to LineIndex for incremental index building.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Implement head/tail 64KB sampling to estimate total line count without scanning the entire file. Also provide read_first_lines() for reading the first N lines for immediate display during progressive loading.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Add xxhash-rust and bincode workspace dependencies for fast hashing and serialization. Implement cache_util for cache directory/path resolution with versioning, and IndexCache for saving/loading line indices to disk with file-hash validation.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Replace Vec<u8> with memmap2::Mmap for file content. Build line index via BufReader streaming (from_reader) instead of scanning mmap'd data, keeping RSS at ~3MB for 5GB files instead of ~5GB.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Rewrite LineIndex to use sparse sampling (every 256 lines) instead of per-line offsets. Add from_reader() for low-RSS streaming index construction via BufReader fill_buf()/consume(), reducing 5GB file RSS from 5122MB to 3.4MB.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Add level detection that tries JSON parsing first (trusts level field), then falls back to keyword scanning with word-boundary checks. Supports SEVERE, FATAL, ERROR, WARN, INFO, DEBUG, TRACE and their abbreviations.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Replace empty AppConfig stub with ColorConfig struct that stores level-to-color mappings as strings. Supports loading/saving from XDG config directory via TOML, with graceful degradation on missing/invalid files.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
