refactor(stdlib): de-abbreviate namespaces (Mem/Sys/Net/Collide)

Expand the abbreviated public namespaces to full words, part of the
language-wide de-abbreviation pass:
  Mem -> Memory, Sys -> System, Net -> Network, Collide -> Collision

Math stays (universally accepted, like int/bool). Renames the dispatch
strings, LSP signatures, docs (dirs, files, frontmatter), and the
inventory manifest; behavior is byte-identical (the bare rt_ targets are
unchanged). Reseeded; C-free bootstrap fixpoint holds; all suites green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/language/system/_section.md

@@ -0,0 +1,7 @@
+---
+id: system
+title: System
+order: 6
+---
+
+Process and OS access — command-line arguments, environment, exit code, running a shell command, and raw file I/O. Outside the deterministic simulation.

docs/language/system/system-arg.md

@@ -0,0 +1,14 @@
+---
+id: system-arg
+name: System.arg
+category: system
+kind: namespace-method
+tokens: System.arg
+sig: System.arg(i) -> str
+tip: A command-line argument by index.
+order: 0
+ns: System
+member: arg
+---
+
+Returns the <code>i</code>-th command-line argument; index 0 is the program path.

docs/language/system/system-arg_count.md

@@ -0,0 +1,14 @@
+---
+id: system-arg_count
+name: System.arg_count
+category: system
+kind: namespace-method
+tokens: System.arg_count
+sig: System.arg_count() -> int
+tip: The number of command-line arguments.
+order: 1
+ns: System
+member: arg_count
+---
+
+Returns how many command-line arguments were passed, including the program path.

docs/language/system/system-env.md

@@ -0,0 +1,14 @@
+---
+id: system-env
+name: System.env
+category: system
+kind: namespace-method
+tokens: System.env
+sig: System.env(name) -> str
+tip: Read an environment variable.
+order: 4
+ns: System
+member: env
+---
+
+Returns the value of environment variable <code>name</code>, or a null string if it is unset.

docs/language/system/system-exit.md

@@ -0,0 +1,14 @@
+---
+id: system-exit
+name: System.exit
+category: system
+kind: namespace-method
+tokens: System.exit
+sig: System.exit(code) -> void
+tip: End the process with a status code.
+order: 2
+ns: System
+member: exit
+---
+
+Terminates the program immediately, returning <code>code</code> to the shell.

docs/language/system/system-file_close.md

@@ -0,0 +1,14 @@
+---
+id: system-file_close
+name: System.file_close
+category: system
+kind: namespace-method
+tokens: System.file_close
+sig: System.file_close(file) -> void
+tip: Close a file.
+order: 11
+ns: System
+member: file_close
+---
+
+Closes <code>file</code>, flushing any buffered writes.

docs/language/system/system-file_open.md

@@ -0,0 +1,14 @@
+---
+id: system-file_open
+name: System.file_open
+category: system
+kind: namespace-method
+tokens: System.file_open
+sig: System.file_open(path, mode) -> ptr
+tip: Open a file.
+order: 6
+ns: System
+member: file_open
+---
+
+Opens <code>path</code> with the given <code>mode</code> (as C <code>fopen</code>) and returns a file handle, or null on failure.

docs/language/system/system-file_read.md

@@ -0,0 +1,14 @@
+---
+id: system-file_read
+name: System.file_read
+category: system
+kind: namespace-method
+tokens: System.file_read
+sig: System.file_read(file, buf, n) -> int
+tip: Read bytes from a file.
+order: 7
+ns: System
+member: file_read
+---
+
+Reads up to <code>n</code> bytes from <code>file</code> into <code>buf</code> and returns the number read.

docs/language/system/system-file_seek.md

@@ -0,0 +1,14 @@
+---
+id: system-file_seek
+name: System.file_seek
+category: system
+kind: namespace-method
+tokens: System.file_seek
+sig: System.file_seek(file, offset, whence) -> int
+tip: Move a file's read/write position.
+order: 9
+ns: System
+member: file_seek
+---
+
+Seeks <code>file</code> to <code>offset</code> relative to <code>whence</code> (as C <code>fseek</code>).

docs/language/system/system-file_tell.md

@@ -0,0 +1,14 @@
+---
+id: system-file_tell
+name: System.file_tell
+category: system
+kind: namespace-method
+tokens: System.file_tell
+sig: System.file_tell(file) -> int
+tip: The current file position.
+order: 10
+ns: System
+member: file_tell
+---
+
+Returns the current read/write offset of <code>file</code>.

docs/language/system/system-file_write.md

@@ -0,0 +1,14 @@
+---
+id: system-file_write
+name: System.file_write
+category: system
+kind: namespace-method
+tokens: System.file_write
+sig: System.file_write(file, buf, n) -> int
+tip: Write bytes to a file.
+order: 8
+ns: System
+member: file_write
+---
+
+Writes <code>n</code> bytes from <code>buf</code> to <code>file</code> and returns the number written.

docs/language/system/system-read_char.md

@@ -0,0 +1,14 @@
+---
+id: system-read_char
+name: System.read_char
+category: system
+kind: namespace-method
+tokens: System.read_char
+sig: System.read_char() -> int
+tip: Read one byte from standard input.
+order: 5
+ns: System
+member: read_char
+---
+
+Reads and returns the next byte from standard input, or a negative value at end of input.

docs/language/system/system-run.md

@@ -0,0 +1,14 @@
+---
+id: system-run
+name: System.run
+category: system
+kind: namespace-method
+tokens: System.run
+sig: System.run(command) -> int
+tip: Run a shell command.
+order: 3
+ns: System
+member: run
+---
+
+Runs <code>command</code> through the system shell and returns its exit status. Blocks until it finishes.

docs/language/system/system-stderr.md

@@ -0,0 +1,14 @@
+---
+id: system-stderr
+name: System.stderr
+category: system
+kind: namespace-method
+tokens: System.stderr
+sig: System.stderr() -> ptr
+tip: The standard error handle.
+order: 13
+ns: System
+member: stderr
+---
+
+Returns the standard-error file handle, for <code>System.file_write</code>.

docs/language/system/system-stdout.md

@@ -0,0 +1,14 @@
+---
+id: system-stdout
+name: System.stdout
+category: system
+kind: namespace-method
+tokens: System.stdout
+sig: System.stdout() -> ptr
+tip: The standard output handle.
+order: 12
+ns: System
+member: stdout
+---
+
+Returns the standard-output file handle, for <code>System.file_write</code>.