perf: streaming I/O, sort/grep/cat/wc optimization, noexcept/nodiscard/constexpr annotations

- Add streaming for_each_line() to io.hpp, refactor stream.hpp to delegate
- Stream grep/cat/wc — no full-file load, handles infinite input
- Optimize sort with precomputed keys, add reserve() across applets
- Mark 72 functions noexcept/[[nodiscard]]/constexpr across 6 headers
- Update README/architecture/Roadmap with current stats and benchmarks

Author: Charliechen114514

README.en.md

@@ -8,15 +8,40 @@ A minimalist BusyBox alternative written in modern C++23.
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![C++23](https://img.shields.io/badge/C++23-00599C?logo=cplusplus)](https://en.cppreference.com/w/cpp/23)
 [![CMake](https://img.shields.io/badge/CMake-3.26+-064F8C?logo=cmake)](https://cmake.org/)
-[![Tests](https://img.shields.io/badge/Tests-149_passing-brightgreen)](tests/)
-[![Applets](https://img.shields.io/badge/Applets-17-brightgreen)](src/applets/)
+[![Tests](https://img.shields.io/badge/Tests-331_passing-brightgreen)](tests/)
+[![Applets](https://img.shields.io/badge/Applets-109-brightgreen)](src/applets/)
 
 ## Overview
 
-CFBox is a single-executable Unix utility collection distributed via symbolic links. 17 applets implemented and tested, with a CI pipeline covering native builds, cross-compilation, and QEMU user/system-mode testing across 5 stages. Features configurable CMake builds (per-applet toggles), GNU-style long options, and colored help output.
+CFBox is a single-executable Unix utility collection distributed via symbolic links. 109 applets implemented and tested, with a CI pipeline covering native builds, cross-compilation, and QEMU user/system-mode testing. Features configurable CMake builds (per-applet toggles), GNU-style long options, and colored help output.
 
 **Design philosophy:** Simplicity first — Modern C++ (`std::expected`) — Embedded-friendly (cross-compilation, static linking)
 
+## Size Comparison
+
+| Project | Language | Size | Applets | Size/Applet |
+|---------|----------|------|---------|-------------|
+| **CFBox (size-opt)** | **C++23** | **446 KB** | **109** | **~4.1 KB** |
+| Toybox | C | ~500 KB | 238 | ~2.1 KB |
+| BusyBox (full) | C | ~1.7 MB | 274 | ~9 KB |
+| uutils/coreutils | Rust | ~11 MB | ~100 | ~110 KB |
+
+> CFBox is **3-4x smaller** than BusyBox while providing a complete AWK interpreter, archive suite (tar/cpio/ar/unzip/gzip), diff/patch (Myers O(ND) algorithm), process tools (ps/top/pstree/pgrep/pmap), and a built-in TUI framework.
+
+## Performance
+
+| Operation | Data Size | Time |
+|-----------|-----------|------|
+| grep -c | 10 MB | 54 ms |
+| cat | 10 MB | 63 ms |
+| wc | 10 MB | 17 ms |
+| sort | 100K lines | 32 ms |
+| diff | 100K lines (similar) | 79 ms |
+
+- grep/cat/wc use streaming I/O — reading `/dev/urandom` won't exhaust memory
+- diff uses Myers O(ND) algorithm; sort precomputes keys to avoid repeated allocation
+- Zero external dependencies: hand-written lightweight deflate/inflate replaces zlib
+
 ## Quick Start
 
 ```bash
@@ -25,8 +50,8 @@ cmake -B build
 cmake --build build
 
 # Test
-ctest --test-dir build --output-on-failure   # 149 GTest unit tests
-bash tests/integration/run_all.sh            # 17 integration test scripts
+ctest --test-dir build --output-on-failure   # 331 GTest unit tests
+bash tests/integration/run_all.sh            # 54 integration test scripts
 
 # Run via subcommand
 ./build/cfbox echo "Hello, World!"
@@ -36,44 +61,37 @@ bash tests/integration/run_all.sh            # 17 integration test scripts
 echo "Hello, World!"   # now calls cfbox via symlink
 ```
 
-## Supported Commands
+## Supported Commands (109)
+
+### Text Processing (28)
+
+`echo`, `printf`, `cat`, `head`, `tail`, `wc`, `sort`, `uniq`, `grep`, `sed`, `fold`, `expand`, `cut`, `paste`, `nl`, `comm`, `tr`, `tac`, `rev`, `shuf`, `factor`, `od`, `split`, `seq`, `tsort`, `expr`, `awk`, `diff` + `patch` + `cmp` + `ed`
+
+### File Operations (20)
+
+`mkdir`, `rm`, `cp`, `mv`, `ls`, `find`, `ln`, `touch`, `stat`, `install`, `mktemp`, `truncate`, `du`, `df`, `readlink`, `realpath`, `rmdir`, `link`, `unlink`, `chmod`
+
+### Archive & Compression (6)
+
+`tar` (ustar format), `cpio` (newc format), `ar` (static library), `unzip`, `gzip`, `gunzip`
+
+### Shell & Scripting (2)
 
-### Text Processing
+`sh` (POSIX shell: pipes, redirections, variable expansion, command substitution, if/while/for, 15 builtins), `xargs`
 
-| Applet | Supported Flags / Features |
-|--------|----------------------------|
-| `echo` | `-n` (no trailing newline), `-e` (interpret escape sequences), all applets support `--help` / `--version` |
-| `printf` | Format strings (`%s` `%d` `%f` `%c` `%%`), format reuse |
-| `cat` | `-n` (number lines), `-b` (number non-blank), `-A` (show non-printing), stdin passthrough |
-| `head` | `-n N` (first N lines), `-c N` (first N bytes), multi-file headers |
-| `tail` | `-n N` (last N lines), `-c N` (last N bytes), multi-file footers |
-| `wc` | `-l` (lines), `-w` (words), `-c` (bytes), `-m` (chars), multi-file totals |
-| `sort` | `-r` (reverse), `-n` (numeric), `-u` (unique), `-k N` (key field), multi-file merge |
-| `uniq` | `-c` (count), `-d` (duplicates only), `-u` (unique only), stdin support |
-| `grep` | `-E` (extended regex), `-i` (ignore case), `-v` (invert), `-n` (line numbers), `-r` (recursive), `-c` (count), `-l` (files with matches), `-q` (quiet) |
-| `sed` | `-n` (suppress auto-print), `-e SCRIPT`; substitution `s/pat/repl/[g\|p\|d]`, line addresses, ranges, `$` |
+### System Info (20)
 
-### File Operations
+`pwd`, `basename`, `dirname`, `uname`, `hostname`, `whoami`, `id`, `tty`, `date`, `nproc`, `logname`, `hostid`, `printenv`, `env`, `uptime`, `free`, `cal`, `dmesg`, `who`, `test`
 
-| Applet | Supported Flags / Features |
-|--------|----------------------------|
-| `mkdir` | `-p`/`--parents` (create parents), `-m`/`--mode MODE` (permissions) |
-| `rm` | `-r`/`--recursive` (recursive), `-f`/`--force` (force), `-i` (interactive), `/` safety check |
-| `cp` | `-r`/`--recursive` (recursive), `-p`/`--preserve` (preserve permissions), multi-file to directory |
-| `mv` | `-f` (force overwrite), cross-filesystem fallback (copy + remove) |
+### Process Management (15)
 
-### Directory & Search
+`ps`, `top`, `kill`, `pgrep`/`pkill`, `pidof`, `pstree`, `pmap`, `fuser`, `pwdx`, `sysctl`, `iostat`, `watch`, `nice`, `renice`, `timeout`
 
-| Applet | Supported Flags / Features |
-|--------|----------------------------|
-| `ls` | `-a`/`--all` (show hidden), `-l`/`--long` (long format), `-h`/`--human-readable` (human-readable sizes) |
-| `find` | `-name PATTERN` (glob), `-type [f\|d\|l]`, `-maxdepth N`, `-exec CMD {} ;` |
+### Other (18)
 
-### System
+`true`, `false`, `yes`, `sleep`, `usleep`, `sync`, `nohup`, `cksum`, `md5sum`, `sum`, `hexdump`, `more`, `tee`, `init` (PID 1 initramfs init system), `mkfifo`, `mknod`, `sleep`, `sh`
 
-| Applet | Description |
-|--------|-------------|
-| `init` | System initialization — auto-mounts proc/sysfs/devtmpfs when PID 1, runs smoke tests, then powers off |
+> All applets support `--help` / `--version`
 
 ## Requirements
 
@@ -86,9 +104,10 @@ echo "Hello, World!"   # now calls cfbox via symlink
 | Document | Description |
 |----------|-------------|
 | [Architecture & Design](document/architecture.md) | Dispatch mechanism, core infrastructure, error handling, testing |
+| [Roadmap](Roadmap.md) | 7-phase development plan, current progress, architecture decisions |
 | [Cross-Compilation & Embedded](document/cross-compilation.md) | Toolchains, CMake options, build examples, binary sizes |
 | [QEMU Testing](document/qemu-testing.md) | User-mode / system-mode testing, init applet, kernel config |
-| [Continuous Integration](document/ci.md) | CI pipeline 5-stage overview |
+| [Continuous Integration](document/ci.md) | CI pipeline overview |
 | [Contributing Guide](CONTRIBUTING.md) | Build, test, code style, submission |
 
 ## Project Structure
@@ -99,28 +118,30 @@ cfbox/
 ├── cmake/
 │   ├── Config.cmake                  # Per-applet configuration (CFBOX_ENABLE_xxx options)
 │   ├── compile/CompilerFlag.cmake    # Compiler warnings & optimization flags
-│   ├── third_party/CPM.cmake        # CPM dependency manager
+│   ├── third_party/CPM.cmake        # CPM dependency manager (GTest only)
 │   └── toolchain/                   # Cross-compilation toolchains
-├── configs/
-│   └── qemu-virt-aarch64.config     # Minimal QEMU aarch64 kernel config
-├── document/                         # Detailed documentation
 ├── include/cfbox/
-│   ├── applet_config.hpp.in         # CMake-generated config (version + enable flags)
 │   ├── applet.hpp / applets.hpp     # Registry & dispatch
 │   ├── args.hpp                     # Short + long option argument parser
-│   ├── help.hpp                     # --help / --version help system
+│   ├── error.hpp                    # std::expected error handling + CFBOX_TRY
+│   ├── io.hpp                       # Streaming I/O (for_each_line, read_all, write_all)
+│   ├── stream.hpp                   # Line-by-line pipeline, LineProcessor
+│   ├── deflate.hpp / inflate.hpp    # Hand-written lightweight DEFLATE (zero deps)
+│   ├── compress.hpp                 # gzip wrapper
+│   ├── utf8.hpp                     # Unicode width/count (constexpr + static_assert)
 │   ├── term.hpp                     # ANSI colored output (NO_COLOR support)
-│   ├── utf8.hpp                     # Unicode-aware width/count utilities
-│   └── ...                          # error.hpp, io.hpp, fs_util.hpp, escape.hpp
+│   ├── terminal.hpp                 # Terminal control (RawMode RAII, cursor, double buffer)
+│   ├── tui.hpp                      # TUI framework (ScreenBuffer, Key, TuiApp)
+│   ├── proc.hpp                     # /proc parser (processes, memory, CPU, disks)
+│   ├── regex.hpp                    # POSIX regex RAII (scoped_regex)
+│   └── ...                          # help.hpp, fs_util.hpp, escape.hpp, checksum.hpp
 ├── src/
 │   ├── main.cpp                     # Dispatch entry
-│   └── applets/                     # 17 command implementations
+│   └── applets/                     # 109 command implementations
 ├── tests/
-│   ├── unit/                        # GTest unit tests (149 cases)
-│   └── integration/                 # Shell integration tests (17 scripts)
-├── scripts/                         # Build, test, install scripts
-├── .github/workflows/ci.yml         # CI pipeline
-└── CONTRIBUTING.md                   # Contributing guide
+│   ├── unit/                        # GTest unit tests (331 cases)
+│   └── integration/                 # Shell integration tests (54 scripts)
+└── scripts/                         # Build, test, install scripts
 ```
 
 ## Contributing