Add tools/check_news_roundtrip.R to validate NEWS.md parse/write fidelity

[Copilot]

Adds a developer script that finds all NEWS.md files reachable from the CWD and verifies that fledge's parse → write cycle is lossless.

Changes

• tools/check_news_roundtrip.R — uses fs::dir_ls() to discover all NEWS.md files recursively, then for each:

  1. Reads lines with brio::read_lines()
  2. Parses via read_news() (internal fledge)
  3. Reconstructs via write_news_sections() + preamble
  4. Compares reconstructed content against original; exits with status 1 on any mismatch or parse error

• .Rbuildignore — adds ^tools$ to exclude the directory from package builds

Usage

Rscript tools/check_news_roundtrip.R

Example output:

Found 5 NEWS.md file(s)

# A tibble: 5 × 3
  file                                           status message
1 NEWS.md                                        ok     ""
2 tests/testthat/_snaps/auto/NEWS.md             fail   "Roundtrip mismatch"
...

Failed files:
 - tests/testthat/_snaps/auto/NEWS.md

Files flagged as fail are ones where fledge would normalize content on next write (e.g. trailing blank lines stripped by write_news_section).

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Create script that iterates through NEWS.md files and checks roundtrip</issue_title>
<issue_description>Look into all directories reachable from the CWD, search for files named NEWS.md . Pure R code, using fs and tidyverse. Store it in tools/, build-ignore the directory.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create script that iterates through NEWS.md files and checks roundtrip #1043

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