chore(deps): update dependency macos to v26

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
macos	github-runner	major	15-intel → 26-intel

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• .github/workflows/ci.yaml
• scripts/test_ci_native_targets.py

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📝 Walkthrough

The test-macos-intel job now runs on macos-26-intel instead of macos-15-intel. Its native darwin/amd64 validation and test/build steps are unchanged.

Changes: macOS Intel CI

Layer / File(s)	Summary
Update macOS Intel runner .github/workflows/ci.yaml	The test-macos-intel job uses the macos-26-intel runner. Its validation and test/build steps are unchanged.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Merge Risk: 🟡 Moderate · up to 3d430

This update moves the macOS Intel CI job to macOS 26, but the repository's native-target check still expects macOS 15. That check will fail until its expected runner is updated to match. Product behavior is unaffected, but the mismatch should be fixed in this PR before merging so CI passes.

Security architecture risk: ⚪ Minimal · up to 3d430

The runner update does not expand configured permissions or credential access, and the native architecture checks and sandbox tests remain intact. No material security risk was identified. The separate runner-label validator still expects the old image.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• observed — The changed execution environment belongs to a CI test-and-build job. Its definition contains no deployment, signing, explicit secret injection, or job-level permission expansion.

Trust Boundaries and Controls

• observed — The workflow runs for main-branch pushes and pull requests with contents: read permissions. The Intel job requires a successful security scan and checks out repository code without persisting checkout credentials before executing tests and builds.

Resilience and Maintainability Implications

• observed — The native-target proof remains fail-fast and precedes sandbox testing. A runner architecture or Go target mismatch stops the job rather than silently accepting a different native target.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies the macOS version update, which matches the main change from macos-15-intel to macos-26-intel.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @.github/workflows/ci.yaml:
- Line 1029: Update NATIVE_TARGETS["test-macos-intel"] in native_target_errors()
to macos-26-intel so it matches the workflow’s runs-on value, preserving the
existing native-target validation behavior.

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• .github/workflows/ci.yaml

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