Digit-bearing issue keys rejected in logs/logger (B9 residual)

[andrewklingelhofer]

Found during review of #369 (B9 follow-up, same bug class).

B9 broadened the identifier regexes in src/cli/spawn.ts to [A-Z][A-Z0-9]*-\d+, but two other sites still reject digit-bearing identifiers like ABC2-123:

• src/logs.ts:7 — critters logs ABC2-123 is rejected
• src/logger.ts:101,133 — identifier extraction for JSON/color log output fails

Fix: apply the same broadened regex in both places.