fix: align linear token sequence semantics

[jbachorik]

Summary

• aligns Linear Token Sequence \s and \S handling with default JDK whitespace semantics
• makes the bracket-tail shortcut require the literal-space delimiters it recognizes
• restricts wildcard LTS admission to globally DOTALL patterns, preserving default-dot semantics
• adds JDK differential and adversarial regression coverage

Validation

• `./gradlew jacocoVerify build`
• focused LTS and categorizer tests after final cleanup
• final implementation-plan validation and code review run independently

Stacked on #112 (which is stacked on #111).

[Copilot]

Pull request overview

This PR tightens and aligns the Linear Token Sequence (LTS) fast-path semantics with the intended Java/JDK regex behavior by (a) matching JDK-style whitespace for \s/\S, (b) making the bracket-tail shortcut enforce the literal-space delimiters it recognizes, and (c) preventing LTS admission of wildcard-dot patterns unless the pattern is globally DOTALL.

Changes:

• Align LTS whitespace/non-whitespace classification with JDK-style whitespace (and add JDK-differential regression coverage).
• Require literal spaces around the bracket-tail shortcut and add adversarial coverage.
• Refuse LTS routing for default-dot wildcard patterns (only allow wildcard LTS when globally DOTALL).

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
reggie-runtime/src/test/java/com/datadoghq/reggie/runtime/LinearTokenSequenceMatcherTest.java	Adds JDK-differential tests for whitespace semantics, bracket-tail delimiter strictness, and DOTALL/default-dot routing.
reggie-runtime/src/main/java/com/datadoghq/reggie/runtime/RuntimeCompiler.java	Tightens LTS admission rules around wildcard-dot usage and DOTALL requirements.
reggie-runtime/src/main/java/com/datadoghq/reggie/runtime/LinearTokenSequenceMatcher.java	Updates LTS whitespace handling and enforces literal-space delimiters for the bracket-tail shortcut; adds SKIP_ANY_EXCEPT_NEWLINE execution path.
reggie-codegen/src/test/java/com/datadoghq/reggie/codegen/analysis/PatternCategorizerTest.java	Updates categorizer fixture to explicitly be DOTALL for bracket-tail shortcut eligibility.
reggie-codegen/src/main/java/com/datadoghq/reggie/codegen/analysis/PatternCategorizer.java	Splits dotall vs default-dot wildcard categorization; requires DOTALL .* for bracket-tail shortcut detection.
reggie-codegen/src/main/java/com/datadoghq/reggie/codegen/analysis/PatternAtom.java	Introduces ANY_STAR_EXCEPT_NEWLINE atom kind.
reggie-codegen/src/main/java/com/datadoghq/reggie/codegen/analysis/LinearTokenSequencePlan.java	Adds SKIP_ANY_EXCEPT_NEWLINE op kind and mapping from the new atom kind.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 68.88889% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.4%. Comparing base (44e3604) to head (81f6dc5).

Files with missing lines	Patch %	Lines
...hq/reggie/codegen/analysis/PatternCategorizer.java	50.0%	0 Missing and 5 partials ⚠️
.../com/datadoghq/reggie/runtime/RuntimeCompiler.java	50.0%	1 Missing and 4 partials ⚠️
...ghq/reggie/runtime/LinearTokenSequenceMatcher.java	81.8%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@ Coverage Diff @@## agent/logs-reggie-l1b #113 +/- ##
=========================================================
- Coverage 84.4% 84.4% -0.1% 
Complexity 1 1 =========================================================
Files 147 147 Lines 42991 42993 +2 Branches 5859 5860 +1 =========================================================
Hits 36296 36296 - Misses 4906 4911 +5 + Partials 1789 1786 -3 

Files with missing lines	Coverage Δ
...ggie/codegen/analysis/LinearTokenSequencePlan.java	82.0% <100.0%> (-0.6%)	⬇️
...datadoghq/reggie/codegen/analysis/PatternAtom.java	87.5% <100.0%> (+0.4%)	⬆️
...ghq/reggie/runtime/LinearTokenSequenceMatcher.java	80.6% <81.8%> (+0.6%)	⬆️
...hq/reggie/codegen/analysis/PatternCategorizer.java	59.3% <50.0%> (-0.1%)	⬇️
.../com/datadoghq/reggie/runtime/RuntimeCompiler.java	87.9% <50.0%> (-0.4%)	⬇️

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