Two divergent CHANGELOG_ENTRY_REGEX constants disagree on what is a valid entry

Follow-up from review of #271.

There are two CHANGELOG_ENTRY_REGEX constants, and after #271 the two tasks that consume them disagree about what counts as a valid CHANGELOG entry.

Consumers: pkg:check_version and Simp::RelChecks use the ComponentInfo one; the deprecated top-level compare_latest_tag and changelog_annotation use the Helpers one.

So an entry like

* Mon Aug 4 2026 Some One <someone@simp-project.com> - 1.2.3

is accepted by compare_latest_tag but rejected by pkg:check_version. The divergence is currently spec-locked in both directions — componentinfo_changelog_regex_spec.rb asserts a single-digit day does not match, helpers_spec.rb asserts it does — so neither can be changed without deciding which behavior is intended.

Why this matters

#270 was caused by a third, ad hoc copy of this regex drifting from the canonical one. #271 removed that copy, but the two remaining constants are the same hazard in slower motion.

Suggested resolution

Decide the intended day/separator/anchoring semantics, then make Simp::Rake::Pupmod::Helpers::CHANGELOG_ENTRY_REGEX an alias of Simp::ComponentInfo::CHANGELOG_ENTRY_REGEX. The capture-group indices are already compatible (1 date, 2 author, 3 version), so consumers need no changes beyond the constant itself.

Worth noting the RPM changelog convention is a zero-padded day, and Simp::ComponentInfo already enforces that on the same files elsewhere in the gem — so standardising on the stricter form is likely correct, but it would start rejecting entries that compare_latest_tag accepts today, which is why this is filed for a decision rather than folded into #271.

Start with componentinfo.rb:22 and helpers.rb:38, then read componentinfo_changelog_regex_spec.rb and helpers_spec.rb alongside the pkg:check_version and deprecated helper consumers. Decide the intended day, separator, anchoring, and qualifier semantics, consolidate the constants accordingly, update the conflicting specs, and run the affected test suite with both accepted and rejected changelog examples.