feat: add merthyr tydfil county borough council scraper

[InertiaUK]

Summary

• New scraper for Merthyr Tydfil County Borough Council (population ~60k, South Wales)
• Simple POST API at merthyr.gov.uk/umbraco/Surface/BinDaySurface/GetCollectionDay
• Area-based collection by postcode - no UPRN or house number needed
• Parses day names + week-one/two fortnightly alternation from HTML response
• Returns weekly recycling + fortnightly household waste and garden waste dates
• Pure HTTP with requests + BeautifulSoup - no Selenium needed

Notes

• Council is actively changing collection rounds; some CF47 postcodes return no data
• CF48 area has best coverage currently

Test plan

• Tested with CF48 3BN (Dowlais) - returns 8 bins across 3 types
• Also tested CF47 0HE, CF48 2BU
• End-to-end verified through Kepthouse API

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3d4e6514-ad79-4fb3-8374-e2b658898ab5

📥 Commits

Reviewing files that changed from the base of the PR and between 8ecf878 and e5c2958.

📒 Files selected for processing (2)

• uk_bin_collection/tests/input.json
• uk_bin_collection/uk_bin_collection/councils/MerthyrTydfilCountyBoroughCouncil.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.67%. Comparing base (8ecf878) to head (e5c2958).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2092   +/-   ##
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  Coverage   86.67%   86.67%           
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  Files           9        9           
  Lines        1141     1141           
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  Hits          989      989           
  Misses        152      152           

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