BOT: Fix #492: Expose get_interval_range() and add add_interval_range()

[nikosbosse]

Summary

• Renames the internal get_range_from_quantile() to get_interval_range() and exports it, giving users direct access to compute interval ranges from quantile levels
• Adds a new exported add_interval_range() function that adds an interval_range column to a data.table with a quantile_level column
• Updates all internal call sites (3 R source files, 1 test file, 1 vignette) to use the renamed function

Root cause

get_range_from_quantile() was marked @keywords internal and not exported, forcing users to use ::: to access it. Maintainer consensus (from the issue discussion) was to rename and export it, plus provide an add_interval_range() convenience wrapper.

What changed

• R/helper-quantile-interval-range.R: Renamed function, added @export and @examples, created add_interval_range()
• R/get-coverage.R, R/metrics-quantile.R: Updated internal call sites
• NAMESPACE: New exports get_interval_range and add_interval_range
• man/: New docs for both functions, deleted old get_range_from_quantile.Rd
• vignettes/Deprecated-visualisations.Rmd: Replaced :::get_range_from_quantile() with ::get_interval_range()

Test coverage

• 7 new test blocks covering: correct output for standard quantiles, edge cases, export accessibility, column addition, integration with example_quantile, copy semantics, error on missing quantile_level, and regression guard for internal callers
• Full test suite: 695 tests pass, 0 failures
• R CMD check: 0 errors, 0 warnings, 2 notes (pre-existing)

Test plan

• New tests verify get_interval_range() returns correct interval ranges
• New tests verify add_interval_range() adds correct column
• Full test suite passes (695 tests)
• R CMD check passes (0 errors, 0 warnings)
• Internal callers (get_coverage(), score(), wis()) still work correctly

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.83%. Comparing base (ac0c01a) to head (cc99ad9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1096   +/-   ##
=======================================
  Coverage   97.83%   97.83%           
=======================================
  Files          35       35           
  Lines        1845     1849    +4     
=======================================
+ Hits         1805     1809    +4     
  Misses         40       40           

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[nikosbosse]

CLAUDE: Clean, well-scoped rename-and-export PR. Correctly renames get_range_from_quantile() to get_interval_range(), exports it, adds add_interval_range() wrapper with proper copy semantics and input validation. All 3 internal call sites updated. Tests are thorough (8 blocks covering standard cases, edge cases, export accessibility, copy semantics, error handling, and regression). Minor note: two old-name references remain in prose/comments within Deprecated-visualisations.Rmd but these are historical documentation in a deprecated vignette — cosmetic only. Verdict: APPROVE.