* Fix /dev/fd, rlimit, spawn scheduler, and context cache
Honor PYTHONEXECUTABLE when computing sys.executable.
Rewind the file offset after a pyc magic probe.
Stop masking rlimit values with RLIM_INFINITY.
Print the pyrepl-unavailable warning before the rustyline shell.
Parse posix_spawn scheduler and apply it where the host supports it.
Update ContextVar cache fields under one lock.
Remove expectedFailure and skip markers for tests that now pass.
Assisted-by: Grok:4.6
* address review: check rlim_t overflow on convert
Replace the u64-to-rlim_t as-cast in py2rlim_limit with
a checked try_from, matching py2rlim.
Assisted-by: Grok:4.6
* Collect consecutive charmap encoding failures
Pass one contiguous run of unmappable characters to the codec error handler, and use the full run when a text replacement is itself unmappable.
Assisted-by: Codex:gpt-5
* Leave conversions out of standalone format specs
A conversion belongs to a replacement field rather than the format specification consumed by format(), so stop accepting and storing it in FormatSpec.
Assisted-by: Codex:gpt-5
* Decode empty byte strings without looking up a codec
Match PyUnicode_FromEncodedObject by returning the shared empty string before resolving the requested encoding for empty bytes and bytearray inputs.
Assisted-by: Codex:gpt-5
* Validate call shape before converting builtin arguments
Reject unknown keywords and excess arguments before conversions can raise a different error. Align Python-function positional-only handling, use declared list arguments in heapq, keep delegated codecs positional-only, and preserve CPython parameter names and validation order.
Assisted-by: Codex:gpt-5
* Align attribute and exception initialization errors
Give __dict__ and type __qualname__ their CPython diagnostics, preserve OSError filename fields correctly, accept seven-item SyntaxError details, and report Unicode error constructor arity before converting values.
Assisted-by: Codex:gpt-5
* Expose missing Unix and Darwin module APIs
Add the platform constants exported by fcntl, mmap, select, socket, syslog, termios, stat, errno, time, and _sre. Implement posix.killpg and resource.getpagesize, and expose resource.error as OSError.
Assisted-by: Codex:gpt-5
* Honor the configured Python CPU count
Parse -X cpu_count and PYTHON_CPU_COUNT, expose the stored value through sys._get_cpu_count_config, and let os.cpu_count prefer it over the host count. Also publish getsizeof with its CPython parameter name.
Assisted-by: Codex:gpt-5
* Fix CPU count and WASI CI coverage
Remove the obsolete expected-failure marker now that CPU count overrides pass, and avoid exporting FASYNC where WASI libc has no O_ASYNC constant.
Assisted-by: Codex:gpt-5
* self review
Jeong, YunWon