v0.9.36b21

Fixed

• Transient duplicate-serial reads self-heal (eg4_web_monitor#258, #200): when two battery slots in one page report the same serial (corrupt read during a misroute storm, or a genuine duplicate-serial pack pair), the accumulator now disambiguates the collision as {serial}@pos{N} with one latched WARNING instead of silently collapsing two packs — and the synthetic entry is re-verified: the next successful read of that bank position under a different identity evicts it, so a one-off corruption can no longer leave a permanent ghost (a genuine duplicate pack simply re-mints its entry every page and stays protected).
• Battery slot debug dump prints the full 15-character serial (#200): the Pos N: line previously decoded only register offsets 17-23 (14 chars), omitting the final character carried in offset 24's low byte — producing phantom "duplicate serials" in debug logs (the red herring in the #258 investigation). It now uses the same read_battery_serial decode as battery identity.

Suite: 2538 passed. Consumed by eg4_web_monitor v3.4.0-beta.19.