BOT: Fix #684: Delete unused check_input_sample/quantile/interval functions

[nikosbosse]

Summary

• Deletes three unused internal functions: check_input_sample(), check_input_quantile(), and check_input_interval()
• These were dead code — never called in production, only tested. A comment in check-input-helpers.R explicitly marks them for future deletion
• Their assert_input_* counterparts remain and are used by all scoring functions

What was changed

• R/metrics-sample.R: Removed check_input_sample() definition and roxygen block
• R/metrics-quantile.R: Removed check_input_quantile() definition and roxygen block
• R/metrics-interval-range.R: Removed check_input_interval() definition and roxygen block
• man/: Deleted 3 corresponding .Rd files
• Tests: Replaced old test blocks with tests confirming functions are removed + regression guards for assert_input_* + end-to-end scoring validation

Test plan

• New "function no longer defined" tests verified to fail before deletion, pass after
• Regression guard tests confirm assert_input_* functions still work correctly
• End-to-end scoring functions work without check_input_* wrappers
• Full test suite passes (683 tests, 0 failures)
• R CMD check passes (0 errors, 0 warnings, 2 pre-existing notes)

Closes #684

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.82%. Comparing base (ac0c01a) to head (238a7d9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1093      +/-   ##
==========================================
- Coverage   97.83%   97.82%   -0.01%     
==========================================
  Files          35       35              
  Lines        1845     1837       -8     
==========================================
- Hits         1805     1797       -8     
  Misses         40       40              

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[nikosbosse]

CLAUDE: Clean, minimal deletion of three unused internal check_input_* wrapper functions (check_input_sample, check_input_quantile, check_input_interval). All were dead code — never called in production, not exported, only tested. The assert_input_* counterparts are correctly preserved. check_try() is correctly left intact. Tests match all 7 specifications: removal confirmation, regression guards for assert_input_*, and end-to-end scoring validation. No scope creep. Verdict: approve.