feat(tools): L10 ludic-fmt enforces a project's style

lint lines in package.ludic - one_statement, max_file_lines, max_function_lines,
max_comment_lines, max_header_lines, paths, baseline - checked by ludic-fmt --check
<files> and ludic-fmt --lint (the project), at the line; a baseline ratchet lets a
rule arrive in a codebase that breaks it (--init-baseline), lowered as it is fixed.
check-impl reads the alias declarations too (it had been blind to every namespace
L6 moved out of the compiler), and eight methods get their pages; a test holds the
formatter to keeping type arguments together (L5).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/language/fs/fs-read_bytes.md

@@ -0,0 +1,26 @@
+---
+id: fs-read_bytes
+name: Fs.read_bytes
+category: fs
+kind: namespace-method
+tokens: Fs.read_bytes
+sig: Fs.read_bytes(path) -> []byte
+tip: A whole file as bytes, or null.
+order: 11
+ns: Fs
+member: read_bytes
+---
+
+Reads a whole file into a `[]byte` - bounds-checked, so no raw memory - or returns <code>null</code> when it cannot be read. It reads through the asset pack like every other load, so it finds a shipped game's files. Pair it with <code>text_of(b, n)</code> for text.
+
+Parameters:
+- `path` — the file to read
+
+```ludic
+program Header {
+  entry {
+    let b = Fs.read_bytes("sound.wav")
+    if b != null { print(b[24]) }
+  }
+}
+```

docs/language/fs/fs-write_bytes.md

@@ -0,0 +1,30 @@
+---
+id: fs-write_bytes
+name: Fs.write_bytes
+category: fs
+kind: namespace-method
+tokens: Fs.write_bytes
+sig: Fs.write_bytes(path, data, count) -> bool
+tip: Writes the first count bytes of a []byte to a file.
+order: 12
+ns: Fs
+member: write_bytes
+---
+
+Writes the first `count` bytes of `data` to `path`, replacing the file, and answers whether all of them were written. `count` is clamped to the slice's length.
+
+Parameters:
+- `path` — the file to write
+- `data` — a `[]byte`, e.g. from <code>buffer(n)</code>
+- `count` — how many bytes of it
+
+```ludic
+program Save {
+  entry {
+    let b = buffer(2)
+    b[0] = 72
+    b[1] = 105
+    print(Fs.write_bytes("hi.bin", b, 2))
+  }
+}
+```