Kaia Counter v0.5.0 — in-house KaiaSpec variant

IMPORTANT:
- This package preserves the original plugin folder/file name so WordPress treats it as the same plugin/update, not a new plugin.
- 8 display cells.
- Before issue: KaiaSpec.
- After issue: ordinary sequential number, zero-padded to 8 digits.
- No rolling animation and no artificial wait.
- GET NUMBER immediately issues and replaces KaiaSpec with the number.
- Success: GOT IT! + disabled/greyed button.
- Failure: KaiaSpec remains and GET NUMBER is restored.
- Existing DB/history/issue guard behavior is preserved.
- The general-purpose 6-digit XXXXXX product design remains separate.
