feat: expose native pattern capabilities

[jbachorik]

Summary

Exposes explicit immutable capabilities for native named-LTS compiled patterns:

• native-only execution;
• native-algorithm linearity, scoped to caller-controlled sequence cost;
• caller-thread cooperative interruptible CharSequence matching.

The capability set is stable across direct compilation, bounded-cache hits, eviction/recompile, and independent compiler instances.

Validation

• ./gradlew :reggie-runtime:test --tests com.datadoghq.reggie.runtime.ReggieNativeCapabilityTest --tests com.datadoghq.reggie.runtime.InterruptibleCharSequenceTest
• ./gradlew :reggie-runtime:test
• ./gradlew spotlessApply
• final implementation-plan validation: clean
• final independent code review: clean

[Copilot]

Pull request overview

This PR introduces an explicit, immutable “capabilities” surface for native named-LTS compiled patterns, and extends tests to ensure those capabilities remain stable across compilation paths and that interruptibility checks execute on the caller thread.

Changes:

• Add ReggieNativeCapability enum to represent guaranteed properties of native named-LTS patterns.
• Expose ReggieCompiledPattern.capabilities() returning a shared immutable capability set.
• Add/extend runtime tests covering capability stability (direct compile, cached compile, eviction/recompile, separate compiler instances) and verifying interrupt checks run on the matching caller thread.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
reggie-runtime/src/main/java/com/datadoghq/reggie/runtime/ReggieNativeCapability.java	Defines the stable capability enum and documents interruptibility/linearity guarantees.
reggie-runtime/src/main/java/com/datadoghq/reggie/runtime/ReggieCompiledPattern.java	Exposes an immutable capability set via capabilities().
reggie-runtime/src/test/java/com/datadoghq/reggie/runtime/ReggieNativeCapabilityTest.java	Adds coverage for capability immutability and stability across caching/eviction/compiler instances.
reggie-runtime/src/test/java/com/datadoghq/reggie/runtime/InterruptibleCharSequenceTest.java	Adds a test asserting interruption checks run on the matching caller thread.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.5%. Comparing base (9d259b3) to head (c3fcc3e).

Additional details and impacted files

@@ Coverage Diff @@## agent/logs-reggie-l1h #119 +/- ##
=======================================================
Coverage 84.4% 84.5% Complexity 1 1 =======================================================
Files 155 156 +1 Lines 43283 43277 -6 Branches 5910 5910 =======================================================
Hits 36571 36571 + Misses 4918 4913 -5 + Partials 1794 1793 -1 

Files with missing lines	Coverage Δ
...atadoghq/reggie/runtime/ReggieCompiledPattern.java	100.0% <100.0%> (+30.0%)	⬆️
.../reggie/runtime/ReggieCompiledPatternCompiler.java	85.7% <100.0%> (-1.2%)	⬇️
...tadoghq/reggie/runtime/ReggieNativeCapability.java	100.0% <100.0%> (ø)

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