Remove ActiveSupport dependency from compact index

[jenshenny]

Replace Object#present? (ActiveSupport) with a pure-Ruby private predicate in CompactIndex::GemVersionMethods, so the vendored lib/compact_index* files in the client no longer rely on Rails being loaded. The predicate preserves present? semantics for content_address (nil or a non-empty hex string), guarding the empty-string case rather than relying on the host application's model validation invariant.

Ref: ruby/rubygems#9773 (comment)

[Copilot]

Pull request overview

Removes the remaining ActiveSupport present? usage from the vendored compact index gem version logic by introducing a pure-Ruby predicate for content_address, keeping lib/compact_index/* usable without Rails loaded.

Changes:

• Replaced content_address.present? checks with a new private content_address? predicate.
• Added content_address? to CompactIndex::GemVersionMethods and used it to control version_token formatting and to_line metadata output.

Suppressed comments (1)

lib/compact_index/gem_version.rb:38

• content_address? does not fully match ActiveSupport present? semantics: whitespace-only strings (e.g. " ") would be treated as present, changing version_token/to_line output and contradicting the PR goal of preserving present? behavior for content_address. Consider treating whitespace-only strings as absent (and handling non-string values safely).

    def content_address?
      !content_address.nil? && !content_address.empty?
    end

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.80%. Comparing base (e2332aa) to head (6f14522).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6825   +/-   ##
=======================================
  Coverage   97.80%   97.80%           
=======================================
  Files         534      534           
  Lines       11771    11773    +2     
=======================================
+ Hits        11513    11515    +2     
  Misses        258      258           

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[brian-penguin]

Lgtm!