Add CLI tool to extract ECDSA public keys from ticket signatures - #16
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Uses ECDSA signature recovery to derive Level 1 public key candidates from UIC barcode tickets. A single signature yields two candidates; intersecting results across multiple tickets signed with the same key narrows it to the unique key. Also adds ardeche, ain, and drome fixtures to the decode-ticket CLI. Verified: provider 5152 key ID 3 (P-256) = 02549c01282fb85da8b901dc... confirmed across all three bus tickets (Ardèche, Ain, Drôme). https://claude.ai/code/session_01Gm1PzLC2s7xn78iQ9BvEGk
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Uses ECDSA signature recovery to derive Level 1 public key candidates
from UIC barcode tickets. A single signature yields two candidates;
intersecting results across multiple tickets signed with the same key
narrows it to the unique key.
Also adds ardeche, ain, and drome fixtures to the decode-ticket CLI.
Verified: provider 5152 key ID 3 (P-256) = 02549c01282fb85da8b901dc...
confirmed across all three bus tickets (Ardèche, Ain, Drôme).
https://claude.ai/code/session_01Gm1PzLC2s7xn78iQ9BvEGk