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29deaaad44
Address the open items from the FEATURES.md audit backlog: - saveChannels() now skips unused slots (all-zero secret) instead of writing all 40 every time, so /channels2 holds only configured channels (was always ~2.7 KB) and wears the flash less. loadChannels() already compacted empties on read, so the loaded result is unchanged. - findChannelIdx() returns -1 for an all-zero secret, so a corrupted/empty channel can't match an unused all-zero slot and misroute messages. - TrailStore gains a static_assert that CAPACITY fits the uint16_t save header count, failing the build instead of silently truncating. Also re-classify two audit items verified to be non-issues in current code: the bot strstr "199-char" truncation (BOT_SCRATCH=200 >= MAX_TEXT_LEN =160, unreachable) and the MSG_PICK reply title (rlen clamped to 20, so title[24] never overflows). Verified: WioTrackerL1_companion_solo_dual builds clean. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>