Fix pause/resume chain, shared print cleanup, add CLAUDE.md

- RESUME is defined only in print/pause_resume.cfg; heat_soak.cfg's
  duplicate replaced it (no unretract, no fan restore). It now runs
  HEAT_SOAK_RESUME -> _RESUME_PRINT -> RESUME_BASE.
- PAUSE runs PAUSE_BASE first, then retracts and parks once (X20 Y345);
  a parked flag makes resume undo only what PAUSE did.
- New _PRINT_CLEANUP shared by PRINT_END and CANCEL_PRINT: heaters incl.
  iHEATER_OFF, fan, M221 S100, bdwidth off, mesh and skew cleared.
  In PRINT_END it runs after RESTORE_GCODE_STATE so the flow reset sticks.
- Add CLAUDE.md and tools/effective_config.py.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -21,7 +21,7 @@ everything below, grouped by topic. Comment out what you do not use there.
 | `blobifier_hw.cfg` | servo and bucket switch pins | — |
 | **print/** | | |
 | `print_start_end.cfg` | `PRINT_WARMUP`, `PRINT_START`, `PRINT_END` | Beacon, AFC, Blobifier, `HEAT_SOAK`, iHeater, bdwidth, bd_pressure PA macros |
-| `pause_resume.cfg` | `PAUSE`, `RESUME`, `CANCEL_PRINT`, `M600` | — |
+| `pause_resume.cfg` | `PAUSE`, `RESUME`, `CANCEL_PRINT`, `M600` (RESUME also handles a running `HEAT_SOAK`; CANCEL_PRINT runs the same cleanup as `PRINT_END`) | `heating/heat_soak.cfg`, `leds/` |
 | `filament.cfg` | `LOAD_FILAMENT`, `UNLOAD_FILAMENT` | — |
 | `homing.cfg` | `HOME` | — |
 | `idle_timeout.cfg` | `[idle_timeout]`: heaters, chamber heater and motors off | iHeater macros |
@@ -59,6 +59,14 @@ Firmware update scripts for all MCUs (Klipper and Katapult). They contain
 this printer's CAN UUIDs and serial IDs: see [scripts/README.md](scripts/README.md)
 before using them on another printer.
 
+### Tools (`tools/`)
+
+`effective_config.py` builds the config Klipper gets from
+`klipper-macros.cfg` (includes expanded, duplicate sections merged) and
+compares it between git refs, for example `python tools/effective_config.py HEAD`
+after a change. `CLAUDE.md` has the notes for working on this repo with
+Claude Code.
+
 ## Install
 
 On the Klipper host: