version 1.2.4

[tilo]

see changelog

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.84%. Comparing base (0ab8258) to head (e50fd12).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #12   +/-   ##
=======================================
  Coverage   99.84%   99.84%           
=======================================
  Files           7        8    +1     
  Lines        1320     1333   +13     
=======================================
+ Hits         1318     1331   +13     
  Misses          2        2           

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[Copilot]

Pull request overview

This PR updates the gem’s build process to default to portable C-extension binaries (avoiding host-instruction crashes) while adding an opt-in mechanism to tune or maximize CPU-specific optimizations at install time, and documents the new behavior.

Changes:

• Introduces a pure, testable CPU-flag selection module (SmarterJSON::CpuFlags) plus RSpec coverage for its contract.
• Updates extconf.rb to probe compiler support for candidate CPU flags and apply them based on SMARTER_JSON_PERFORMANCE.
• Documents the new build-time performance levels in the README/docs and records the release notes; bumps the gem version.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
spec/cpu_flags_spec.rb	Adds RSpec contract tests for CPU optimization flag selection behavior.
ext/smarter_json/cpu_flags.rb	Implements mkmf-free normalization/selection of CPU flags for portable/tuned/max builds.
ext/smarter_json/extconf.rb	Integrates compiler probing + env-controlled CPU flag selection into build optflags.
README.md	Documents SMARTER_JSON_PERFORMANCE build-time performance/portability tradeoffs and examples.
docs/_introduction.md	Adds introduction docs section explaining build-time performance tuning and safety.
CHANGELOG.md	Records the portable-default change and the new build option for the 1.2.4 entry.
lib/smarter_json/version.rb	Bumps gem version constant to 1.2.4.

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