bug: skills scripts missing test directory for unit tests

[spazyCZ]

Description

The package format spec (§01) and skills spec (§03) do not define a tests/ directory within the skills scripts/ structure for unit tests. This makes it impossible to verify script correctness before packaging or deployment.

Expected behavior

The package structure defined in 01-package-format.md and the skills spec in 03-skills.md should include a tests/ directory for skills that contain scripts, enabling unit testing of script logic.

Affected files

• docs/spec/01-package-format.md
• docs/spec/03-skills.md