Fix ESP32-C2 build: support multiple archive formats in framework extraction

[Copilot]

ESP32-C2 CI builds fail with tarfile.ReadError: not an lzma file because framework_esp32.py hardcodes tarfile.open(path, "r:xz") for all framework archives, but pioarduino packages may use .tar.gz or .zip.

Changes

• src/fbuild/packages/framework_esp32.py: Use tarfile.open(path, "r:*") for auto-detection, add zipfile extraction path, extend magic byte validation to cover gzip and zip formats

# Before (breaks on non-xz archives)
with tarfile.open(archive_path, "r:xz") as tar:
    tar.extractall(temp_dir)

# After (auto-detects compression)
if archive_name.endswith(".zip"):
    with zipfile.ZipFile(archive_path, "r") as zf:
        zf.extractall(temp_dir)
else:
    with tarfile.open(archive_path, "r:*") as tar:
        tar.extractall(temp_dir)

• tests/esp32c2/esp32c2.ino: Replace LED_BUILTIN (undefined on C2) with explicit GPIO 8
• tests/unit/packages/test_framework_archive_formats.py: 7 tests covering magic byte validation and extraction for .tar.xz, .tar.gz, .zip, plus a regression test proving "r:xz" fails on .tar.gz

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

• example.com
  • Triggering command: /usr/bin/python python -m pytest tests/unit/packages/test_framework_archive_formats.py -v (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
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Original prompt

test the esp32c2 and revive the build badge. Whatever problems you find fix them.

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