TigerTag: custom message and bed temperature (supersedes #18)

[TigerTag-Project]

This PR takes over #18 by @physicsG and adds the fixes it needed to pass the tests on the current main. @physicsG's commits are kept as-is, with their authorship.

From #18

• New GenericFilament fields: bed_temp_max_c and message
• The TigerTag parser now fills bed_temp_c (min) and bed_temp_max_c (max) instead of always returning 0.0
• The 28-byte custom message (+48, pages 0x10-0x16) is read as UTF-8 text, for example a filament name
• Updated TigerTag fixtures and a synthetic New Fields TigerTag fixture generated by test/scripts/build_tigertag_fixture.py

Fixes on top

• Synthetic fixture header: the .bin had zeros where the NTAG capability container should be, so test_physical_dump_preserves_processor_output[New Fields TigerTag] (added with NTAG216 support) failed with KeyError: 0. The generator now writes a real NTAG215 header: a 7-byte UID with its BCC check bytes, plus the capability container E1 10 3E 00.
• Nozzle temperatures: the fixture had min 230 / max 190. They are swapped to min 190 / max 230.
• Comments: aligned with the current TigerTag spec. The custom message is 28 bytes of free UTF-8 text with no reserved emoji prefix, and +76..+78 holds Measure Available. The parsing code is unchanged, since it already matches the spec.

Tests

97 passed, 1 skipped once merged with current main.

Closes #18