feat(precheck): check if power pins have USE in definition (#139)

* feat(precheck): check if power pins have `USE` in definition

* fix: expect zero or more spaces, instead of one or more

* feat(precheck): check for missing `USE POWER`

* feat(precheck): check for missing `USE GROUND`

* feat(precheck): add simple README with link to LEF/DEF reference manual
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kris j
2025-11-20 08:57:05 +02:00
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# Precheck
## Documentation reference
- [LEF/DEF Language Reference (cadence) (November 2009)](https://www.ispd.cc/contests/18/lefdefref.pdf) ([web archive](https://web.archive.org/web/20250809120606/https://www.ispd.cc/contests/18/lefdefref.pdf))