Ryan Malloy 867b304773 Add BCM4500 register map and fill documentation gaps
New page: bcm4500/register-map.mdx consolidates all register
addresses (direct, indirect page 0, FX2 XRAM/IRAM, I2C controller)
into a single lookup reference with cross-reference index.

Expanded sections:
- fw213-variants: hardware detection mechanism, distinguishing
  characteristics table, FW1 demod type detection signatures
- demodulator: probe logic (3x3 retry, INT0 40-iteration boot probe
  at 0x7F/0x3F, no_demod_flag graceful degradation)
- version-comparison: version ID gap aside (v2.07.04 is a kernel
  constant, not a real firmware release)

Cross-links added to signal-monitoring and tuning-protocol pages.
2026-02-12 23:28:54 -07:00
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