test: add unit tests for discovery_queries() and chunked()

[yunaremaia]

Adds unit tests for two functions in scripts/radar.py as requested in issue #75.

DiscoveryTests — tests for discovery_queries() with language='Rust', config with min_stars=500 and pushed_within_days=60, and date(2026, 10, 1):

• Verifies the language is quoted: language:"Rust"
• Verifies min stars qualifier: stars:>=500
• Verifies pushed date qualifier: pushed:>=2026-08-02 (60 days before 2026-10-01)
• Verifies two issue qualifiers are present: good-first-issues:>=1 and help-wanted-issues:>=1

ChunkedTests — tests for chunked():

• Empty list returns no chunks
• Exact multiple of size produces equal chunks
• Remainder produces a final smaller chunk

All 36 tests pass with python3.12 -m unittest discover scripts. Ruff check and format are clean.

Fixes #75

[github-actions]

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[TanbirRamim]

nice, clean tests! I added one more that pins the whole query string, so the archived:false / fork:false / is:public filters are covered too (dropping one of those would quietly pull forks into the radar).

[TanbirRamim]

merged, thanks @yunaremaia! if the radar's been useful to you, a star helps other newcomers find it.