docs: update CLAUDE.md and progress for sim migration

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

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

@@ -67,20 +67,32 @@ All directories have `__init__.py`. Model migration from sim worktree is a separ
 
 ## Phase 4 — Scaffold `reader/` and `sim/`
 
-**Status: Complete (scaffolded)**
+**Status: sim/ migrated, reader/ scaffolded**
+
+### sim/ migration (complete)
+
+Migrated full sim framework from `.worktrees/sim-framework/` to `pm3py/sim/`:
+- 43 source files, ~7.8k LOC
+- 23 test files, 686 tests
+- Import fixes: 4 source files (..protocol/..transport → ..core.*), 1 source file (pm3py.hf_15 → pm3py.trace.ndef), 2 test files (flat → core.*)
+- Added sim Cmd entries to `core/protocol.py` (EML_SETMEM, SIM_TABLE_*)
+- Added deps to venv: `pycryptodome`, `bitarray`
+- **751 total tests passing** (686 sim + 65 core)
+
+### reader/ (scaffolded)
 
 Created directory trees per design:
 - `reader/hf/nxp/` — NXP reader ICs (CLRC663, PN5xx)
 - `reader/hf/st/` — ST reader ICs
 - `reader/lf/`
 - `reader/modes/` — inventory, programming, access control workflows
-- `sim/` — sim session, table compiler, relay (migrate from worktree)
 
-All directories have `__init__.py`. Sim migration (~41 files, 7.8k LOC) is a separate effort.
+All reader directories have `__init__.py` stubs.
 
 ## Next Steps
 
-- Transponder migration: extract base classes from sim worktree, populate `transponders/` modules
-- Sim migration: move sim session, table compiler, relay into `sim/`
+- Reorganize transponder models from `sim/` into `transponders/` hierarchy (optional — sim/ works as-is)
 - Reader modes: implement inventory, programming, access workflows in `reader/modes/`
-- Sniff: add `decode_iso14a.py` stub when 14443-A sniff support is added
+- Unify `sim/trace_fmt.py` with `trace/` package (dedup 15693 decoders, move 14443-A decoders)
+- Sniff: add `decode_iso14a.py` using decoders from `sim/trace_fmt.py`
+- Sim worktree cleanup: verify parity, then remove `.worktrees/sim-framework/`