feat(stdlib): add os.walk, makedirs(exist_ok), getpid, getppid and os.path improvements

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Summary

Extends Os.fs with several commonly-needed functions that were missing from the module, including the most-requested pattern os.makedirs(path, exist_ok=True).

Changes

New os functions

Binding	Python API	Notes
os.makedirs(path, exist_ok)	os.makedirs(path, exist_ok=bool)	Keyword-arg emission; fixes the usability gap where exist_ok required mode too
os.makedirs(path, mode, exist_ok)	os.makedirs(path, mode, bool)	Explicit 3-arg form (replaces old binding)
os.walk(top)	os.walk(top)	Yields (dirpath, dirnames, filenames) tuples
os.walk(top, topdown)	os.walk(top, topdown=bool)	Control traversal order
os.getpid()	os.getpid()	Current process ID
os.getppid()	os.getppid()	Parent process ID

New os.path functions

Binding	Python API
os.path.isabs(path)	os.path.isabs(path)
os.path.islink(path)	os.path.islink(path)
os.path.realpath(path)	os.path.realpath(path)
os.path.getsize(path)	os.path.getsize(path)

Tests

7 new tests added to test/TestOs.fs.

Motivation

The most common pain point is os.makedirs(path, exist_ok=True) — the previous binding forced callers to also supply mode, which is unusual. The new overload uses [<Emit("$0.makedirs($1, exist_ok=$2)")>] to pass exist_ok as a keyword argument.

os.walk is one of Python's most widely-used directory traversal functions and was absent entirely.

Trade-offs

• All changes are additive; no existing signatures were modified.
• The old makedirs(path * mode * exist_ok) overload is preserved for backward compatibility.

Note

🔒 Integrity filter blocked 10 items

The following items were blocked because they don't meet the GitHub integrity level.

• How does it generate the python source from AST? #5 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
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