Block-form pattern-match handler at the call site

[serradura]

Summary

• Micro::Case::Result::Wrapper#success / #failure now accept *types (splat) — a strict superset of the prior single-optional-type form, so one branch can match multiple result types (on.success(:ok, :created) { ... }).
• #success / #failure / #unknown dispatch on block.arity: 2-arity blocks receive (data, type); 1-arity (and 0/-1/-2) keep receiving the full Result. Every existing call site is unchanged byte-for-byte.
• Unlocks the motivating call site:

  MyCase.call(input) do |on|
    on.success(:ok, :created) { |data, type| ... }
    on.failure                { |data, type| ... }
    on.unknown                { |result|     ... }
  end

• No new public constants; no new exceptions on previously-silent paths. Exhaustiveness (raise when no branch matched and no unknown was declared) is intentionally deferred to a follow-up gated by an opt-in, so the current silent-Kind::Undefined fallback stays observable.
• CHANGELOG.md records the change under ## [Unreleased] — version bump intentionally skipped here (per the author's instruction); the release commit can roll this into the next minor.
• README.md and README.pt-BR.md get a new Block-form handler at the call site / Handler em forma de bloco no local da chamada subsection under "Working with results", in lockstep.

Test plan

• bundle exec rake test — 814 runs, 8229 assertions, 0 failures
• ENABLE_TRANSITIONS=true bundle exec rake test — green
• ENABLE_TRANSITIONS=false bundle exec rake test — green
• New test/micro/case/result/wrapper_test.rb — 19 cases covering:
  • backward compat: 1-arity / no-type / single-symbol-type variants of success, failure, unknown
  • new *types splat matching on success and failure (matches when any listed type matches; skips when none do)
  • new 2-arity (data, type) blocks on success, failure, unknown
  • mixed-arity in the same handler (motivating shape)
  • type-filter miss falls through so unknown still fires
  • one-branch-wins (first matching success wins; later ones skipped)
  • Micro::Case.call block-form returns wrapper.output; non-block returns the Result
  • unknown does not run when a success/failure already matched
• CI: full Ruby × Rails matrix + the ENABLE_TRANSITIONS=true|false axis

🤖 Generated with Claude Code