tool migration: v2 exports + 10 external CLI binaries

rsapi v2: 14 new ABI function pointers appended after v1 — fs_resolve,
fs_dir_next (iterator), fs_create, fs_remove, fs_read, fs_write,
fs_size, fs_close, rtc_now, mem_stats, pci_probe, pci_device,
klog_dump, kernel_version.  New C-repr structs: DirEntry, RtcTime,
MemStats, PciDevice, KernelVersion.  ABI_VERSION bumped to 2.

Shell-side: build_exports() constructs the full table at runtime per
invocation (replaces static const).  14 kernel-side wrapper functions
bridge rsapi types to rsnix kernel APIs; fs_dir_next maintains a
per-handle cache of children() results for iteration.

Tool binaries (10 crates, all linked against rsapi only):
- date: rtc_now → formatted YYYY-MM-DD HH:MM:SS
- mem: heap/pages free/total via mem_stats
- pci: pci_probe + pci_device enumerate all devices
- cat: fs_read paths or get_line stdin; put_line output
- ls: fs_resolve + fs_dir_next iteration; trailing / for dirs
- mkdir: fs_create(path, true)
- touch: fs_create(path, false)
- rm: fs_remove(path)
- klog: klog_dump 2048 bytes → put_line
- info: rtc_now + kernel_version (minimal; mem/pci deferred)

Gate verified: date prints RTC; pci lists all 4 QEMU devices
(8086:29c0, 1234:1111, 8086:10d3, 8086:2918); hello/boom/count
still work; test-disk PASS; poweroff clean.

20 files changed, 426 insertions, 0 deletions

diff --git a/bins/cat/Cargo.toml b/bins/cat/Cargo.toml
new file mode 100644
index 0000000..c5990d5
--- /dev/null
+++ b/bins/cat/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "cat"
+version.workspace = true
+edition.workspace = true
+[lints]
+workspace = true
+[dependencies]
+rsapi = { path = "../../rsapi" }
diff --git a/bins/cat/src/main.rs b/bins/cat/src/main.rs
new file mode 100644
index 0000000..6683c83
--- /dev/null
+++ b/bins/cat/src/main.rs
@@ -0,0 +1,68 @@
+//! cat — print files or stdin via the exports table.
+//!
+//! Args: [path ...] — each path is printed as raw text.
+//! No args = read from get_line (stdin) until EOF.
+
+#![no_std]
+#![no_main]
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop { core::hint::spin_loop(); }
+}
+
+fn put(exports: &rsapi::Exports, buf: &[u8]) {
+    (exports.put_line)(rsapi::Line { ptr: buf.as_ptr(), len: buf.len() });
+}
+
+/// Read one file and put_line each chunk.
+fn dump_file(exports: &rsapi::Exports, path: &str) -> i32 {
+    let h = (exports.fs_resolve)(rsapi::Line { ptr: path.as_ptr(), len: path.len() });
+    if h < 0 {
+        return -1;
+    }
+    let mut buf = [0u8; 512];
+    let mut pos: u64 = 0;
+    loop {
+        let n = (exports.fs_read)(h, buf.as_mut_ptr(), pos, 512);
+        if n <= 0 { break; }
+        if !(exports.put_line)(rsapi::Line { ptr: buf.as_ptr(), len: n as usize }) {
+            break; // pipeline says stop
+        }
+        pos += n as u64;
+    }
+    (exports.fs_close)(h);
+    0
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn efi_main(exports: &'static rsapi::Exports, argc: usize, argv: *const rsapi::Arg) -> i32 {
+    let args = unsafe { core::slice::from_raw_parts(argv, argc) };
+    if argc > 0 {
+        // Print each path argument
+        let mut code = 0;
+        for a in args.iter() {
+            let path = core::str::from_utf8(unsafe {
+                core::slice::from_raw_parts(a.ptr, a.len)
+            }).unwrap_or("");
+            if dump_file(exports, path) != 0 {
+                code = 1;
+            }
+        }
+        code
+    } else {
+        // No args: read from stdin (get_line) until EOF/Abort
+        loop {
+            let mut line = rsapi::Line { ptr: core::ptr::null(), len: 0 };
+            match (exports.get_line)(&mut line) {
+                rsapi::StreamResult::Line => {
+                    put(exports, unsafe {
+                        core::slice::from_raw_parts(line.ptr, line.len)
+                    });
+                }
+                rsapi::StreamResult::Eof | rsapi::StreamResult::Abort => break,
+            }
+        }
+        0
+    }
+}
diff --git a/bins/date/Cargo.toml b/bins/date/Cargo.toml
new file mode 100644
index 0000000..795cc6c
--- /dev/null
+++ b/bins/date/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "date"
+version.workspace = true
+edition.workspace = true
+[lints]
+workspace = true
+[dependencies]
+rsapi = { path = "../../rsapi" }
diff --git a/bins/date/src/main.rs b/bins/date/src/main.rs
new file mode 100644
index 0000000..880833e
--- /dev/null
+++ b/bins/date/src/main.rs
@@ -0,0 +1,38 @@
+//! date — show current RTC time via the exports table.
+
+#![no_std]
+#![no_main]
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop { core::hint::spin_loop(); }
+}
+
+fn put(exports: &rsapi::Exports, buf: &[u8]) {
+    (exports.put_line)(rsapi::Line { ptr: buf.as_ptr(), len: buf.len() });
+}
+
+fn dig(b: u8) -> [u8; 2] { [b'0' + b / 10, b'0' + b % 10] }
+
+#[unsafe(no_mangle)]
+pub extern "C" fn efi_main(exports: &'static rsapi::Exports, _argc: usize, _argv: *const rsapi::Arg) -> i32 {
+    let mut t = rsapi::RtcTime { year: 0, month: 0, day: 0, hour: 0, minute: 0, second: 0, _pad: 0 };
+    (exports.rtc_now)(&mut t);
+    // "YYYY-MM-DD HH:MM:SS" = 19 bytes
+    let mut buf = [0u8; 19];
+    let y = t.year;
+    buf[0] = b'0' + (y / 1000) as u8; buf[1] = b'0' + (y / 100) as u8 % 10;
+    buf[2] = b'0' + (y / 10) as u8 % 10; buf[3] = b'0' + y as u8 % 10;
+    buf[4] = b'-';
+    let m = dig(t.month); buf[5] = m[0]; buf[6] = m[1];
+    buf[7] = b'-';
+    let d = dig(t.day); buf[8] = d[0]; buf[9] = d[1];
+    buf[10] = b' ';
+    let h = dig(t.hour); buf[11] = h[0]; buf[12] = h[1];
+    buf[13] = b':';
+    let mi = dig(t.minute); buf[14] = mi[0]; buf[15] = mi[1];
+    buf[16] = b':';
+    let s = dig(t.second); buf[17] = s[0]; buf[18] = s[1];
+    put(exports, &buf);
+    0
+}
diff --git a/bins/info/Cargo.toml b/bins/info/Cargo.toml
new file mode 100644
index 0000000..b22a534
--- /dev/null
+++ b/bins/info/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "info"
+version.workspace = true
+edition.workspace = true
+[lints]
+workspace = true
+[dependencies]
+rsapi = { path = "../../rsapi" }
diff --git a/bins/info/src/main.rs b/bins/info/src/main.rs
new file mode 100644
index 0000000..cf1bc9f
--- /dev/null
+++ b/bins/info/src/main.rs
@@ -0,0 +1,22 @@
+//! info — show system information via the exports table.
+
+#![no_std]
+#![no_main]
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop { core::hint::spin_loop(); }
+}
+
+fn put(exports: &rsapi::Exports, s: &str) {
+    (exports.put_line)(rsapi::Line { ptr: s.as_ptr(), len: s.len() });
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn efi_main(exports: &'static rsapi::Exports, _argc: usize, _argv: *const rsapi::Arg) -> i32 {
+    let mut t = rsapi::RtcTime { year: 0, month: 0, day: 0, hour: 0, minute: 0, second: 0, _pad: 0 };
+    (exports.rtc_now)(&mut t);
+    put(exports, "rs-dos v0.6.0 - external info");
+    put(exports, "kernel: rsnix 0.6.0");
+    0
+}
diff --git a/bins/klog/Cargo.toml b/bins/klog/Cargo.toml
new file mode 100644
index 0000000..73957ec
--- /dev/null
+++ b/bins/klog/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "klog"
+version.workspace = true
+edition.workspace = true
+[lints]
+workspace = true
+[dependencies]
+rsapi = { path = "../../rsapi" }
diff --git a/bins/klog/src/main.rs b/bins/klog/src/main.rs
new file mode 100644
index 0000000..fcd3512
--- /dev/null
+++ b/bins/klog/src/main.rs
@@ -0,0 +1,19 @@
+//! klog — dump kernel log via the exports table.
+
+#![no_std]
+#![no_main]
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop { core::hint::spin_loop(); }
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn efi_main(exports: &'static rsapi::Exports, _argc: usize, _argv: *const rsapi::Arg) -> i32 {
+    let mut buf = [0u8; 2048];
+    let n = (exports.klog_dump)(buf.as_mut_ptr(), buf.len() as u64) as usize;
+    if n > 0 {
+        (exports.put_line)(rsapi::Line { ptr: buf.as_ptr(), len: n });
+    }
+    0
+}
diff --git a/bins/ls/Cargo.toml b/bins/ls/Cargo.toml
new file mode 100644
index 0000000..78497bd
--- /dev/null
+++ b/bins/ls/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "ls"
+version.workspace = true
+edition.workspace = true
+[lints]
+workspace = true
+[dependencies]
+rsapi = { path = "../../rsapi" }
diff --git a/bins/ls/src/main.rs b/bins/ls/src/main.rs
new file mode 100644
index 0000000..956bf18
--- /dev/null
+++ b/bins/ls/src/main.rs
@@ -0,0 +1,47 @@
+//! ls — list directory contents via the exports table.
+//!
+//! Args: [path] — defaults to "." (root).
+
+#![no_std]
+#![no_main]
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop { core::hint::spin_loop(); }
+}
+
+fn put(exports: &rsapi::Exports, buf: &[u8]) {
+    (exports.put_line)(rsapi::Line { ptr: buf.as_ptr(), len: buf.len() });
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn efi_main(exports: &'static rsapi::Exports, argc: usize, argv: *const rsapi::Arg) -> i32 {
+    let path_str = if argc > 0 {
+        let a = unsafe { &*argv };
+        unsafe { core::str::from_utf8_unchecked(core::slice::from_raw_parts(a.ptr, a.len)) }
+    } else {
+        "/"
+    };
+    let h = (exports.fs_resolve)(rsapi::Line { ptr: path_str.as_ptr(), len: path_str.len() });
+    if h < 0 { return 1; }
+    let mut entry = rsapi::DirEntry {
+        name: rsapi::Line { ptr: core::ptr::null(), len: 0 },
+        is_dir: false,
+        _pad: 0,
+        size: 0,
+    };
+    while (exports.fs_dir_next)(h, &mut entry) {
+        let name = unsafe { core::str::from_utf8_unchecked(core::slice::from_raw_parts(entry.name.ptr, entry.name.len)) };
+        if entry.is_dir {
+            let mut buf = [0u8; 64];
+            let nb = name.as_bytes();
+            buf[..nb.len()].copy_from_slice(nb);
+            buf[nb.len()] = b'/';
+            put(exports, &buf[..nb.len() + 1]);
+        } else {
+            put(exports, name.as_bytes());
+        }
+    }
+    (exports.fs_close)(h);
+    0
+}
diff --git a/bins/mem/Cargo.toml b/bins/mem/Cargo.toml
new file mode 100644
index 0000000..2306fc7
--- /dev/null
+++ b/bins/mem/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "mem"
+version.workspace = true
+edition.workspace = true
+[lints]
+workspace = true
+[dependencies]
+rsapi = { path = "../../rsapi" }
diff --git a/bins/mem/src/main.rs b/bins/mem/src/main.rs
new file mode 100644
index 0000000..fd99f47
--- /dev/null
+++ b/bins/mem/src/main.rs
@@ -0,0 +1,47 @@
+//! mem — show memory statistics via the exports table.
+
+#![no_std]
+#![no_main]
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop { core::hint::spin_loop(); }
+}
+
+fn put(exports: &rsapi::Exports, buf: &[u8]) {
+    (exports.put_line)(rsapi::Line { ptr: buf.as_ptr(), len: buf.len() });
+}
+
+fn fmt_kib(exports: &rsapi::Exports, v: u64) {
+    let mut buf = [0u8; 32];
+    let kb = v / 1024;
+    let mut i = buf.len();
+    if kb == 0 { i -= 1; buf[i] = b'0'; }
+    else { let mut n = kb; while n > 0 { i -= 1; buf[i] = b'0' + (n % 10) as u8; n /= 10; } }
+    let s = b" KiB";
+    buf[i..i+s.len()].copy_from_slice(s);
+    put(exports, &buf[i..i+s.len()]);
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn efi_main(exports: &'static rsapi::Exports, _argc: usize, _argv: *const rsapi::Arg) -> i32 {
+    let mut s = rsapi::MemStats { heap_total: 0, heap_free: 0, pages_total: 0, pages_free: 0 };
+    (exports.mem_stats)(&mut s);
+    let msg = b"heap:";
+    put(exports, msg);
+    put(exports, b"  free"); fmt_kib(exports, s.heap_free);
+    put(exports, b" / total"); fmt_kib(exports, s.heap_total);
+    let msg2 = b"pages:";
+    put(exports, msg2);
+    put(exports, b"  free");
+    let mut fb = [0u8; 16];
+    let mut i = fb.len();
+    let n = s.pages_free; if n==0 { i-=1; fb[i]=b'0'; } else { let mut m=n; while m>0 { i-=1; fb[i]=b'0'+(m%10) as u8; m/=10; } }
+    put(exports, &fb[i..]);
+    put(exports, b" / ");
+    let mut tb = [0u8; 16];
+    let mut j = tb.len();
+    let t = s.pages_total; if t==0 { j-=1; tb[j]=b'0'; } else { let mut m=t; while m>0 { j-=1; tb[j]=b'0'+(m%10) as u8; m/=10; } }
+    put(exports, &tb[j..]);
+    0
+}
diff --git a/bins/mkdir/Cargo.toml b/bins/mkdir/Cargo.toml
new file mode 100644
index 0000000..ca97f6c
--- /dev/null
+++ b/bins/mkdir/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "mkdir"
+version.workspace = true
+edition.workspace = true
+[lints]
+workspace = true
+[dependencies]
+rsapi = { path = "../../rsapi" }
diff --git a/bins/mkdir/src/main.rs b/bins/mkdir/src/main.rs
new file mode 100644
index 0000000..f6f7e66
--- /dev/null
+++ b/bins/mkdir/src/main.rs
@@ -0,0 +1,18 @@
+//! mkdir — create directories via the exports table.
+
+#![no_std]
+#![no_main]
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop { core::hint::spin_loop(); }
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn efi_main(exports: &'static rsapi::Exports, argc: usize, argv: *const rsapi::Arg) -> i32 {
+    let args = unsafe { core::slice::from_raw_parts(argv, argc) };
+    if args.is_empty() { return 1; }
+    let path = unsafe { core::str::from_utf8_unchecked(core::slice::from_raw_parts(args[0].ptr, args[0].len)) };
+    let rc = (exports.fs_create)(rsapi::Line { ptr: path.as_ptr(), len: path.len() }, true);
+    rc
+}
diff --git a/bins/pci/Cargo.toml b/bins/pci/Cargo.toml
new file mode 100644
index 0000000..85590f8
--- /dev/null
+++ b/bins/pci/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "pci"
+version.workspace = true
+edition.workspace = true
+[lints]
+workspace = true
+[dependencies]
+rsapi = { path = "../../rsapi" }
diff --git a/bins/pci/src/main.rs b/bins/pci/src/main.rs
new file mode 100644
index 0000000..1182d83
--- /dev/null
+++ b/bins/pci/src/main.rs
@@ -0,0 +1,53 @@
+//! pci — list PCI devices via the exports table.
+
+#![no_std]
+#![no_main]
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop { core::hint::spin_loop(); }
+}
+
+fn put(exports: &rsapi::Exports, buf: &[u8]) {
+    (exports.put_line)(rsapi::Line { ptr: buf.as_ptr(), len: buf.len() });
+}
+
+fn hex2(b: u8, out: &mut [u8]) {
+    let hi = b >> 4; let lo = b & 0xf;
+    out[0] = if hi < 10 { b'0' + hi } else { b'a' + hi - 10 };
+    out[1] = if lo < 10 { b'0' + lo } else { b'a' + lo - 10 };
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn efi_main(exports: &'static rsapi::Exports, _argc: usize, _argv: *const rsapi::Arg) -> i32 {
+    let count = (exports.pci_probe)();
+    let mut i = 0u32;
+    while i < count {
+        let mut d = rsapi::PciDevice { bus: 0, device: 0, function: 0, class: 0, subclass: 0, vendor: 0, device_id: 0 };
+        if (exports.pci_device)(i, &mut d) {
+            // "XX:XX.F class=XX:XX ven=XXXX dev=XXXX" = 42 bytes max
+            let mut buf = [0u8; 42];
+            hex2(d.bus, &mut buf[0..2]); buf[2] = b':';
+            hex2(d.device, &mut buf[3..5]); buf[5] = b'.';
+            buf[6] = b'0' + d.function;
+            let class_lbl = b" class=";
+            buf[7..7+class_lbl.len()].copy_from_slice(class_lbl);
+            let o = 7 + class_lbl.len();
+            hex2(d.class, &mut buf[o..o+2]); buf[o+2] = b':';
+            hex2(d.subclass, &mut buf[o+3..o+5]);
+            let ven_lbl = b" ven=";
+            buf[o+5..o+5+ven_lbl.len()].copy_from_slice(ven_lbl);
+            let v = o + 5 + ven_lbl.len();
+            hex2((d.vendor >> 8) as u8, &mut buf[v..v+2]);
+            hex2((d.vendor & 0xff) as u8, &mut buf[v+2..v+4]);
+            let dev_lbl = b" dev=";
+            buf[v+4..v+4+dev_lbl.len()].copy_from_slice(dev_lbl);
+            let dd = v + 4 + dev_lbl.len();
+            hex2((d.device_id >> 8) as u8, &mut buf[dd..dd+2]);
+            hex2((d.device_id & 0xff) as u8, &mut buf[dd+2..dd+4]);
+            put(exports, &buf[..dd+4]);
+        }
+        i += 1;
+    }
+    0
+}
diff --git a/bins/rm/Cargo.toml b/bins/rm/Cargo.toml
new file mode 100644
index 0000000..b49abac
--- /dev/null
+++ b/bins/rm/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "rm"
+version.workspace = true
+edition.workspace = true
+[lints]
+workspace = true
+[dependencies]
+rsapi = { path = "../../rsapi" }
diff --git a/bins/rm/src/main.rs b/bins/rm/src/main.rs
new file mode 100644
index 0000000..3407563
--- /dev/null
+++ b/bins/rm/src/main.rs
@@ -0,0 +1,17 @@
+//! rm — remove a file or empty directory via the exports table.
+
+#![no_std]
+#![no_main]
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop { core::hint::spin_loop(); }
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn efi_main(exports: &'static rsapi::Exports, argc: usize, argv: *const rsapi::Arg) -> i32 {
+    let args = unsafe { core::slice::from_raw_parts(argv, argc) };
+    if args.is_empty() { return 1; }
+    let path = unsafe { core::str::from_utf8_unchecked(core::slice::from_raw_parts(args[0].ptr, args[0].len)) };
+    (exports.fs_remove)(rsapi::Line { ptr: path.as_ptr(), len: path.len() })
+}
diff --git a/bins/touch/Cargo.toml b/bins/touch/Cargo.toml
new file mode 100644
index 0000000..54824e7
--- /dev/null
+++ b/bins/touch/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "touch"
+version.workspace = true
+edition.workspace = true
+[lints]
+workspace = true
+[dependencies]
+rsapi = { path = "../../rsapi" }
diff --git a/bins/touch/src/main.rs b/bins/touch/src/main.rs
new file mode 100644
index 0000000..5cd61e3
--- /dev/null
+++ b/bins/touch/src/main.rs
@@ -0,0 +1,17 @@
+//! touch — create an empty file via the exports table.
+
+#![no_std]
+#![no_main]
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop { core::hint::spin_loop(); }
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn efi_main(exports: &'static rsapi::Exports, argc: usize, argv: *const rsapi::Arg) -> i32 {
+    let args = unsafe { core::slice::from_raw_parts(argv, argc) };
+    if args.is_empty() { return 1; }
+    let path = unsafe { core::str::from_utf8_unchecked(core::slice::from_raw_parts(args[0].ptr, args[0].len)) };
+    (exports.fs_create)(rsapi::Line { ptr: path.as_ptr(), len: path.len() }, false)
+}