refactor: scaffold sniff/, transponders/, reader/, sim/ sub-packages

Phases 2-4 of package refactor. Creates the full directory tree with
__init__.py files per the design doc. Actual code migration from the
sim worktree is a separate effort — models have deep inheritance chains
and auth mixins that need base class extraction first.

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

pm3py/reader/__init__.py

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+"""pm3py.reader — Higher-level reader modes composing core commands."""

pm3py/reader/hf/__init__.py

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+"""HF reader modes organized by reader IC manufacturer."""

pm3py/reader/hf/nxp/__init__.py

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+"""NXP reader ICs (CLRC663, PN5xx)."""

pm3py/reader/hf/st/__init__.py

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+"""ST Microelectronics reader ICs."""

pm3py/reader/lf/__init__.py

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+"""LF reader modes."""

pm3py/reader/modes/__init__.py

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+"""Reader workflow modes — inventory, programming, access control."""

pm3py/sim/__init__.py

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+"""pm3py.sim — Card simulation sessions, table compiler, relay."""

pm3py/sniff/__init__.py

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+"""pm3py.sniff — Sniff sessions, trace parsing, protocol decoders, formatting."""

pm3py/transponders/__init__.py

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+"""pm3py.transponders — Tag/transponder models independent of hardware."""

pm3py/transponders/hf/__init__.py

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+"""HF transponder models organized by ISO standard, then manufacturer."""

pm3py/transponders/hf/iso14443a3/__init__.py

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+"""ISO 14443-A Layer 3 transponders (MIFARE Classic, Ultralight, NTAG)."""

pm3py/transponders/hf/iso14443a3/nxp/__init__.py

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+"""NXP ISO 14443-A Layer 3 transponders."""

pm3py/transponders/hf/iso14443a4/__init__.py

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+"""ISO 14443-A Layer 4 (ISO-DEP) transponders (DESFire, NTAG 5 via -4)."""

pm3py/transponders/hf/iso14443a4/nxp/__init__.py

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+"""NXP ISO 14443-A Layer 4 transponders."""

pm3py/transponders/hf/iso15693/__init__.py

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+"""ISO 15693 transponder models and NFC Forum Type 5 NDEF."""

pm3py/transponders/hf/iso15693/nxp/__init__.py

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+"""NXP ICODE / NTAG 5 ISO 15693 transponders."""

pm3py/transponders/hf/iso15693/st/__init__.py

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+"""ST Microelectronics ISO 15693 transponders."""

pm3py/transponders/lf/__init__.py

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+"""LF transponder models organized by manufacturer."""

pm3py/transponders/lf/atmel/__init__.py

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+"""Atmel/Microchip LF transponders (T55xx)."""

pm3py/transponders/lf/em/__init__.py

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+"""EM Microelectronic LF transponders (EM4100, EM4x05)."""