Release Cortext v1.2.2

[gabewillen]

Summary

• synchronize all maintained version surfaces at 1.2.2
• record the merged consolidation and retrieval fixes in RELEASE.md
• prepare PyPI, npm, and GitHub publication from one exact source commit

Verification

• all version surfaces parse as 1.2.2
• release diff is limited to seven version/release metadata files
• preflight Python wheel and sdist contain six native targets, no model payload, and pass Twine checks
• preflight npm tarball contains six native targets, no model payload, loads native version 1.2.2, and passes the binding contract
• final registry artifacts will be rebuilt from the integrated tagged commit before publication

No source-id, MIME, or modality-specific behavior and no arbitrary consolidation trigger is introduced.

[Copilot]

Pull request overview

This PR prepares the v1.2.2 release by synchronizing version identifiers across the repo’s maintained build and packaging surfaces, and updating RELEASE.md to record the consolidated fixes and release verification notes.

Changes:

• Bump maintained version surfaces from 1.2.1 to 1.2.2 (CMake, Zig, Python, JS, Dart).
• Update RELEASE.md for v1.2.2, including highlights, verification notes, and publish targets.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
RELEASE.md	Updates the tracked release artifact to v1.2.2 with new highlights, verification, packaging notes, and publish targets.
CMakeLists.txt	Bumps project(... VERSION ...) to 1.2.2, which propagates to CORTEXT_VERSION via existing compile definitions.
build.zig.zon	Updates the Zig package version string to 1.2.2.
build.zig	Updates the Zig build’s cortext_version string and the semantic version tuple to 1.2.2.
bindings/python/pyproject.toml	Updates the Python package version to 1.2.2.
bindings/javascript/package.json	Updates the npm package version to 1.2.2.
bindings/dart/pubspec.yaml	Updates the Dart package version to 1.2.2.

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