docs(V2): IBKR integration implementation plan
16 task TDD-disciplinati con 94 step checkbox, riferimento allo spec
2026-05-03. Ogni task: red-green-commit con codice completo nello step.
Copre: settings, OAuth1a signer + DH LST mint, IBKRClient REST + conid
cache + tickle, IBKRWebSocket tick/depth snapshot-on-demand, simple +
complex orders (bracket/OCO/OTO), KeyRotationManager con auto-rollback,
admin endpoints, router wiring, OAuth setup script, docs.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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