feat: 10 test-suite improvements — consolidate extended messages, split C headers, add summary matrices, generator validation docs

[Copilot]

• Investigate CI failures (3 distinct failures)
• Fix 1: Restore tests/proto/common_types.sf (deleted in prev commit, imported by pkg_test_messages.sf) — fixes Python pkg_test_messages ImportError and TypeScript roundtrip compilation failure
• Fix 2: Add normalize-expected round-trip in tests/py/include/extended_messages.py::check_message — fixes Python extended decode 0/10 for ProfileBulk and ProfileNetwork

[rijesha]

@copilot fix the failing test suite

[Copilot]

@copilot fix the failing test suite

Fixed in commit 17a590b. Two root causes:

1. common_types.sf accidentally deleted — tests/proto/pkg_test_messages.sf imports it; without it the generator couldn't emit get_message_info into pkg_test_messages.py, causing the Python roundtrip ImportError, and the missing common-types.structframe.ts caused the TypeScript roundtrip compilation failure. Restored the file.

2. check_message missing normalization in tests/py/include/extended_messages.py — fixed-size string fields (e.g. short_text [size=16]) get null-padded during serialisation but the raw constructor value is shorter, so decoded != expected without normalising. Added the same expected_normalized = msg_class.deserialize(expected.serialize()) round-trip that the standard and variable-flag helpers already use, fixing the Python extended decode 0/10 failure for ProfileBulk and ProfileNetwork.