Feature/packet generation#32
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Add the ability to generate AES-CTR (v0) and AES-EAX (v2) Hubble BLE advertisement packets locally from a key and payload — the inverse of the existing decrypt path. Generated packets can optionally be posted to the Hubble Cloud or printed as raw bytes for matching against hardware emissions. SDK: - encrypt(key, payload, *, time_counter, seq_no, counter_mode) — AES-CTR - encrypt_eax(key, payload, *, counter, nonce_salt, period_exponent) — AES-EAX - Both return EncryptedPacket so org.ingest_packet works for either protocol. - _generate_ctr_eid helper mirrors firmware hubble_internal_device_id_get. - EAX EID derivation matches decrypt_eax exactly (key_0 from counter=0) to guarantee byte-for-byte round-trip even at high effective counters. CLI: hubblenetwork ble generate - Flags: --key, --payload(/format), --counter-mode, --counter, --seq-no, --nonce-salt, --period-exponent, --ingest, --format breakdown|hex|json - Dispatches by key length (32 → CTR, 16 → EAX) with mutually-exclusive flag validation per protocol. - Three output formats: structured breakdown (default), raw hex, and JSON. Tests: 44 new tests covering round-trip via decrypt/decrypt_eax, validation paths, header layout, EID embedding, format dispatch, and the --ingest path (with mocked Organization). Spec: docs/superpowers/specs/2026-04-30-packet-generation-design.md Plan: docs/superpowers/plans/2026-04-30-packet-generation.md
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The b"int-uptime-" prefix (11 bytes) plus 4 random bytes produced a 15-byte payload, exceeding MAX_CTR_PAYLOAD. Shortened to b"int-up-".
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