Instead of compile-time LORA_CR define, MAX_TEXT_LEN is now determined
at runtime by reading the actual coding rate from the radio hardware.
Added getMaxTextLen() to RadioLibWrapper and Dispatcher:
- CR4/5: 48 bytes (~16 JP chars, TX ~3808ms)
- CR4/6: 32 bytes (~10 JP chars)
- CR4/7: 24 bytes (~8 JP chars)
- CR4/8: 16 bytes (~5 JP chars, default)
getCodingRate() added to CustomSX1262Wrapper to read codingRate
from RadioLib PhysicalLayer at runtime.
Tested: 48-byte limit with LORA_CR=5, 16-byte limit with LORA_CR=8.
Instead of overloading getOutboundCount() with a magic sentinel value,
add a dedicated getOutboundTotal() method to the PacketManager interface
that returns the total queue size without time filtering.
This eliminates the fragile convention that caused the regression and
makes the two operations — time-filtered count vs total count —
explicitly separate in the API.
PR #1795 changed PacketQueue::countBefore() to use signed 2's complement
arithmetic for millis wraparound safety. However, this broke the
0xFFFFFFFF sentinel pattern used by callers to mean "count all packets
regardless of schedule".
With the signed comparison, countBefore(0xFFFFFFFF) always returns 0,
causing hasPendingWork() to report false and repeaters to sleep with
packets still queued. Stats reporting also shows queue_len as 0.
Add an early-return for the sentinel value before the loop, and document
the sentinel convention on the virtual interface and implementation.
