refactor: move modules into core/ sub-package, normalize naming

Phase 1 of package refactor. Moves all source modules into pm3py/core/
with file renames (hf_14a→hf_iso14a, hf_15→hf_iso15, hf_mf→hf_mfc)
and client attribute normalization (hf.a14→hf.iso14a, hf.mf→hf.mfc).
pm3py/__init__.py re-exports from core for backward compat.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/plans/2026-03-18-refactor-progress.md

@@ -0,0 +1,52 @@
+# pm3py Refactor Progress
+
+**Design:** [2026-03-18-refactor-design.md](2026-03-18-refactor-design.md)
+**Branch:** `refactor/core-package`
+**Started:** 2026-03-18
+
+## Phase 1 — Create `core/`, normalize names, fix imports
+
+**Status: Complete**
+
+### What was done
+
+- Created `pm3py/core/` sub-package
+- Moved all source modules into `core/`:
+  - `protocol.py`, `transport.py`, `client.py`, `hw.py`, `hf.py`, `lf.py` — moved as-is
+  - `hf_14a.py` → `hf_iso14a.py` (renamed)
+  - `hf_15.py` → `hf_iso15.py` (renamed)
+  - `hf_mf.py` → `hf_mfc.py` (renamed)
+- Normalized client attributes:
+  - `hf.a14` → `hf.iso14a`
+  - `hf.mf` → `hf.mfc`
+  - `hf.iso15` — unchanged
+- Created `core/__init__.py` re-exporting: `Proxmark3`, `FirmwareInfo`, `PM3Transport`, `PM3Error`, `PM3Response`, `PM3Status`, `Cmd`
+- Updated `pm3py/__init__.py` to import from `.core.*`
+- Updated all 10 test files (imports + attribute references)
+- **30/30 tests passing**
+
+### Backward compatibility
+
+- `from pm3py import Proxmark3` still works (re-exported)
+- **Breaking:** `hf.a14` → `hf.iso14a`, `hf.mf` → `hf.mfc`
+- **Breaking:** Direct imports like `from pm3py.hf_14a import ...` → `from pm3py.core.hf_iso14a import ...`
+
+## Phase 2 — Extract `sniff/`
+
+**Status: Deferred — no sniff infrastructure exists yet**
+
+`hf_iso15.py` is 94 lines of clean reader commands + thin `sniff()` firmware call. The trace parsing, 15693 decoders, NDEF annotation, and ANSI formatting described in the design doc haven't been written yet. Nothing to extract.
+
+Will revisit when sniff infrastructure is implemented.
+
+## Phase 3 — Scaffold `transponders/`
+
+**Status: Not started — models live in sim worktree**
+
+Transponder models exist in `.worktrees/sim-framework/` but haven't been merged to master. Scaffold when ready to migrate.
+
+## Phase 4 — Scaffold `reader/` and `sim/`
+
+**Status: Not started**
+
+Depends on Phase 3 and sim worktree merge.

pm3py/__init__.py

@@ -1,6 +1,6 @@
 """pm3py - Python wire protocol library for Proxmark3."""
-from .client import Proxmark3
-from .transport import PM3Error, PM3Response
-from .protocol import PM3Status, Cmd
+from .core.client import Proxmark3
+from .core.transport import PM3Error, PM3Response
+from .core.protocol import PM3Status, Cmd
 
 __all__ = ["Proxmark3", "PM3Error", "PM3Response", "PM3Status", "Cmd"]

pm3py/core/__init__.py

@@ -0,0 +1,10 @@
+"""pm3py.core — Wire protocol, transport, and device commands."""
+from .client import Proxmark3, FirmwareInfo
+from .transport import PM3Transport, PM3Error, PM3Response
+from .protocol import PM3Status, Cmd
+
+__all__ = [
+    "Proxmark3", "FirmwareInfo",
+    "PM3Transport", "PM3Error", "PM3Response",
+    "PM3Status", "Cmd",
+]

pm3py/core/client.py

@@ -10,9 +10,9 @@ from .transport import PM3Transport, PM3Response, PM3Error, ProgressCallback
 from .hw import HWCommands
 from .lf import LFCommands
 from .hf import HFCommands
-from .hf_14a import HF14ACommands
-from .hf_15 import HF15Commands
-from .hf_mf import HFMFCommands
+from .hf_iso14a import HF14ACommands
+from .hf_iso15 import HF15Commands
+from .hf_mfc import HFMFCommands
 
 log = logging.getLogger(__name__)
 
@@ -68,9 +68,9 @@ class Proxmark3:
         self.hw = HWCommands(self._transport)
         self.lf = LFCommands(self._transport)
         self.hf = HFCommands(self._transport)
-        self.hf.a14 = HF14ACommands(self._transport)
+        self.hf.iso14a = HF14ACommands(self._transport)
         self.hf.iso15 = HF15Commands(self._transport)
-        self.hf.mf = HFMFCommands(self._transport)
+        self.hf.mfc = HFMFCommands(self._transport)
         self.firmware = FirmwareInfo()
 
     async def connect(self) -> None:
@@ -157,7 +157,7 @@ class _SyncProxy:
         if isinstance(attr, (HWCommands, LFCommands, HFCommands,
                              HF14ACommands, HF15Commands, HFMFCommands)):
             return _SyncProxy(attr, self._loop)
-        # Sub-modules attached dynamically (e.g. hf.a14, hf.mf)
+        # Sub-modules attached dynamically (e.g. hf.iso14a, hf.mfc)
         if hasattr(attr, '_t'):
             return _SyncProxy(attr, self._loop)
         if callable(attr) and inspect.iscoroutinefunction(attr):

pm3py/core/hf.py

@@ -11,9 +11,9 @@ class HFCommands:
     def __init__(self, transport: PM3Transport):
         self._t = transport
         # Sub-modules attached by client.py
-        self.a14 = None  # type: ignore
+        self.iso14a = None  # type: ignore
         self.iso15 = None  # type: ignore
-        self.mf = None  # type: ignore
+        self.mfc = None  # type: ignore
 
     async def tune(self, on_progress: ProgressCallback = None) -> dict:
         """Measure HF antenna voltage."""
@@ -38,9 +38,9 @@ class HFCommands:
             if asyncio.iscoroutine(ret):
                 await ret
 
-        if self.a14:
+        if self.iso14a:
             try:
-                card = await self.a14.scan()
+                card = await self.iso14a.scan()
                 if card.get("uid"):
                     results["iso14443a"] = card
             except PM3Error:

tests/test_crc.py

@@ -1,4 +1,4 @@
-from pm3py.protocol import crc16_a
+from pm3py.core.protocol import crc16_a
 
 def test_crc16_a_empty():
     assert crc16_a(b"") == 0x6363  # init 0xC6C6 reflected = 0x6363

tests/test_hf.py

@@ -1,8 +1,8 @@
 import asyncio
 from unittest.mock import AsyncMock
-from pm3py.protocol import Cmd
-from pm3py.transport import PM3Response
-from pm3py.hf import HFCommands
+from pm3py.core.protocol import Cmd
+from pm3py.core.transport import PM3Response
+from pm3py.core.hf import HFCommands
 
 def test_hf_tune():
     t = AsyncMock()

tests/test_hf_14a.py

@@ -1,9 +1,9 @@
 import struct
 import asyncio
 from unittest.mock import AsyncMock
-from pm3py.protocol import Cmd
-from pm3py.transport import PM3Response
-from pm3py.hf_14a import HF14ACommands
+from pm3py.core.protocol import Cmd
+from pm3py.core.transport import PM3Response
+from pm3py.core.hf_iso14a import HF14ACommands
 
 def test_14a_scan():
     t = AsyncMock()

tests/test_hf_15.py

@@ -1,8 +1,8 @@
 import asyncio
 from unittest.mock import AsyncMock
-from pm3py.protocol import Cmd
-from pm3py.transport import PM3Response
-from pm3py.hf_15 import HF15Commands
+from pm3py.core.protocol import Cmd
+from pm3py.core.transport import PM3Response
+from pm3py.core.hf_iso15 import HF15Commands
 
 def test_15_scan():
     t = AsyncMock()

tests/test_hf_mf.py

@@ -1,9 +1,9 @@
 import struct
 import asyncio
 from unittest.mock import AsyncMock
-from pm3py.protocol import Cmd
-from pm3py.transport import PM3Response
-from pm3py.hf_mf import HFMFCommands
+from pm3py.core.protocol import Cmd
+from pm3py.core.transport import PM3Response
+from pm3py.core.hf_mfc import HFMFCommands
 
 def test_mf_rdbl():
     t = AsyncMock()

tests/test_hw.py

@@ -1,9 +1,9 @@
 import struct
 import asyncio
 from unittest.mock import AsyncMock
-from pm3py.protocol import Cmd
-from pm3py.transport import PM3Response
-from pm3py.hw import HWCommands
+from pm3py.core.protocol import Cmd
+from pm3py.core.transport import PM3Response
+from pm3py.core.hw import HWCommands
 
 def make_ng_response(cmd: int, status: int, payload: bytes) -> PM3Response:
     return PM3Response(cmd=cmd, status=status, reason=0, ng=True, data=payload)
@@ -91,7 +91,7 @@ def test_led_brightness():
 
 def test_led_pwm_non_capable_raises():
     """PWM on a non-PWM LED should raise PM3Error."""
-    from pm3py.transport import PM3Error
+    from pm3py.core.transport import PM3Error
     import pytest
     transport = make_mock_transport()
     hw = HWCommands(transport)

tests/test_integration.py

@@ -3,7 +3,7 @@ import struct
 import asyncio
 from unittest.mock import AsyncMock, MagicMock
 from pm3py import Proxmark3, Cmd
-from pm3py.client import FirmwareInfo
+from pm3py.core.client import FirmwareInfo
 
 
 def test_full_api_surface():
@@ -14,9 +14,9 @@ def test_full_api_surface():
     assert hasattr(pm3, "lf")
     assert hasattr(pm3, "hf")
     assert hasattr(pm3.lf, "t55")
-    assert hasattr(pm3.hf, "a14")
+    assert hasattr(pm3.hf, "iso14a")
     assert hasattr(pm3.hf, "iso15")
-    assert hasattr(pm3.hf, "mf")
+    assert hasattr(pm3.hf, "mfc")
     assert hasattr(pm3, "send_ng")
     assert hasattr(pm3, "send_mix")
     assert hasattr(pm3, "firmware")
@@ -27,7 +27,7 @@ def test_hw_ping_roundtrip():
     """Test ping returns structured dict."""
     pm3 = Proxmark3("/dev/null")
     mock_transport = AsyncMock()
-    from pm3py.transport import PM3Response
+    from pm3py.core.transport import PM3Response
     ping_data = bytes(range(32))
     mock_transport.send_ng.return_value = PM3Response(
         cmd=Cmd.PING, status=0, reason=0, ng=True, data=ping_data)
@@ -41,21 +41,21 @@ def test_mf_rdbl_returns_hex():
     """Verify MIFARE read returns hex string data."""
     pm3 = Proxmark3("/dev/null")
     mock_transport = AsyncMock()
-    from pm3py.transport import PM3Response
+    from pm3py.core.transport import PM3Response
     block = bytes(range(16))
     mock_transport.send_ng.return_value = PM3Response(
         cmd=Cmd.HF_MIFARE_READBL, status=0, reason=0, ng=True, data=block)
-    pm3.hf.mf._t = mock_transport
+    pm3.hf.mfc._t = mock_transport
     result = asyncio.get_event_loop().run_until_complete(
-        pm3.hf.mf.rdbl(block=4, key="FFFFFFFFFFFF"))
+        pm3.hf.mfc.rdbl(block=4, key="FFFFFFFFFFFF"))
     assert result["data"] == "000102030405060708090a0b0c0d0e0f"
     assert result["raw"] == block
 
 
 def test_sync_proxy():
     """Verify sync proxy wraps async calls."""
-    from pm3py.transport import PM3Response
-    from pm3py.client import _SyncProxy
+    from pm3py.core.transport import PM3Response
+    from pm3py.core.client import _SyncProxy
 
     pm3 = Proxmark3("/dev/null")
     loop = asyncio.new_event_loop()
@@ -83,7 +83,7 @@ def test_firmware_probe_compatible():
     pm3._transport = mock_transport
     pm3.hw._t = mock_transport
 
-    from pm3py.transport import PM3Response
+    from pm3py.core.transport import PM3Response
 
     ping_data = bytes(range(32))
     vstr = b"Proxmark3 RDV4.0 FW v4.18000\x00"
@@ -109,7 +109,7 @@ def test_firmware_probe_ping_fails():
     pm3._transport = mock_transport
     pm3.hw._t = mock_transport
 
-    from pm3py.transport import PM3Response, PM3Error
+    from pm3py.core.transport import PM3Response, PM3Error
 
     vstr = b"Proxmark3 OLD\x00"
     version_payload = struct.pack("<III", 0x270B0A40, 256*1024, len(vstr)) + vstr

tests/test_lf.py

@@ -1,9 +1,9 @@
 import struct
 import asyncio
 from unittest.mock import AsyncMock
-from pm3py.protocol import Cmd
-from pm3py.transport import PM3Response
-from pm3py.lf import LFCommands
+from pm3py.core.protocol import Cmd
+from pm3py.core.transport import PM3Response
+from pm3py.core.lf import LFCommands
 
 def make_response(cmd, status, data):
     return PM3Response(cmd=cmd, status=status, reason=0, ng=True, data=data)

tests/test_transport.py

@@ -1,6 +1,6 @@
 import struct
-from pm3py.transport import encode_ng_frame, decode_response_frame, encode_mix_frame, _crc_to_wire
-from pm3py.protocol import Cmd, CMD_PREAMBLE_MAGIC, CMD_POSTAMBLE_NOCRC, RESP_PREAMBLE_MAGIC, RESP_POSTAMBLE_NOCRC, crc16_a
+from pm3py.core.transport import encode_ng_frame, decode_response_frame, encode_mix_frame, _crc_to_wire
+from pm3py.core.protocol import Cmd, CMD_PREAMBLE_MAGIC, CMD_POSTAMBLE_NOCRC, RESP_PREAMBLE_MAGIC, RESP_POSTAMBLE_NOCRC, crc16_a
 
 def test_encode_ng_frame_ping_no_payload():
     frame = encode_ng_frame(Cmd.PING, b"")