Correct wire format to disassembly: raw S1||crypt(S2), radix 32, int snno/seconds, decryptData response parser, --probe

- envelope: 7 fixed keys + conditional dataArea, no data key; int
  type/snno, seconds timestamp, data setter auto len/crc (CRC32 upper);
  SequenceNumber 1..9999 (increaseSN)
- crypto: encrypt is plaintext-header-first a||transform(b), key radix 32
  at both tryParse sites; decrypt_data ports decryptData (dual-0x58
  markers, s+'}' equipNo probe, s+','+T return); decrypt_request kept
  for the device-side known-header split
- socket: raw send (no length prefix), accumulate-and-try receive
- battery: queryAPowerData shape (data={'update':2}), radix default 32,
  --probe prints exact TX/RX bytes per variant; device_local.send_probe
- docs: RE_DART_FINDINGS ss3/5/8 + open items, BATTERY_POC host recipe
- tests: 19 new protocol tests, suite 44/44 green

franklinwh_agate_client/protocol/__init__.py

@@ -15,15 +15,25 @@ from .crc import (
     le_bytes_to_int16,
 )
 from .crypto import (
-    ALT_KEY_RADIX,
     DEFAULT_KEY_RADIX,
+    MARKER,
+    decrypt_data,
     decrypt_object,
+    decrypt_request,
     encrypt_object,
     generate_secret_key,
     header_len_for,
     split_envelope,
 )
-from .envelope import KEY_ORDER, PLACEHOLDER, CommunicationObject, direct_connect_request
+from .envelope import (
+    KEY_ORDER,
+    SNNO_MAX,
+    SNNO_MIN,
+    PLACEHOLDER,
+    CommunicationObject,
+    SequenceNumber,
+    direct_connect_request,
+)
 from .framing import (
     MAGIC_ACK,
     MAGIC_DATA,
@@ -52,15 +62,20 @@ __all__ = [
     "int16_to_le_bytes",
     "le_bytes_to_int16",
     "DEFAULT_KEY_RADIX",
-    "ALT_KEY_RADIX",
+    "MARKER",
     "generate_secret_key",
     "split_envelope",
     "encrypt_object",
     "decrypt_object",
+    "decrypt_request",
+    "decrypt_data",
     "header_len_for",
     "KEY_ORDER",
+    "SNNO_MIN",
+    "SNNO_MAX",
     "PLACEHOLDER",
     "CommunicationObject",
+    "SequenceNumber",
     "direct_connect_request",
     "MAGIC_ACK",
     "MAGIC_DATA",