v1.0.40 — Multi-Path Path Table, MODE_FULL, Heap Fixes

Changes

Multi-Path Path Table

• PathEntry struct with score-based selection (bitrate / (hops+1))
• Up to 3 paths per destination (WiFi + LoRa coexist)
• Old 80-line quality gate replaced with 2-line anti-replay check
• Targeted failover: mark_path_unresponsive preserves backup paths when a link fails on one interface

Interface Modes

• All interfaces set to MODE_FULL — removes mode-based announce blocking

Heap Fixes

• std::set → std::vector migration (eliminates tree-node fragmentation: ~23KB overhead removed)
• std::map<Bytes,T> → flat vector migration for path_requests, reverse_table, announce_rate_table, discovery_path_requests
• Path request culling timeout: 24h → 40s (entries were accumulating unnecessarily)
• Firewall gate on backbone path requests for non-whitelisted destinations
• clear_caches_in_memory() for heap pressure relief

Other

• Link::attached_interface() const getter added (was declared but not implemented)

Flash Options

File	Usage
rtnode_heltec_v3.bin	Heltec V3 — firmware update only
rtnode_heltec_v3_merged.bin	Heltec V3 — full wipe + install
rtnode_heltec_v4.bin	Heltec V4 — firmware update only
rtnode_heltec_v4_merged.bin	Heltec V4 — full wipe + install