feat: add bounded char sequence LTS execution

[jbachorik]

Summary

• add an internal bounded LTS whole-match primitive over CharSequence.charAt()
• preserve absolute capture spans and caller-array atomicity without materializing the input
• make bounded LTS helpers respect the region end, including delimiter, HTTP-version, bracket-tail, and wildcard-tail paths
• add guarded real expanded Grok fixture coverage for successful and failing nonzero regions

Why

This is the direct-execution prerequisite for using Reggie with logs-backend's interruptible input wrapper. It ensures matching cannot bypass deadline checks through String bulk operations or read outside the requested region.

Validation

• ./gradlew :reggie-runtime:test --tests '*LinearTokenSequenceMatcherTest' --tests '*LinearTokenSequenceAccessLogTest' --tests '*LinearTokenSequenceMatcherConcurrencyTest'
• ./gradlew jacocoVerify build

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Codecov Report

❌ Patch coverage is 79.04762% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.4%. Comparing base (5d31eba) to head (44e3604).

Files with missing lines	Patch %	Lines
...ghq/reggie/runtime/LinearTokenSequenceMatcher.java	79.0%	2 Missing and 20 partials ⚠️

Additional details and impacted files

@@ Coverage Diff @@## agent/logs-reggie-l1a #112 +/- ##
=======================================================
Coverage 84.4% 84.4% Complexity 1 1 =======================================================
Files 147 147 Lines 42960 42991 +31 Branches 5851 5859 +8 =======================================================
+ Hits 36260 36296 +36 + Misses 4916 4906 -10 - Partials 1784 1789 +5 

Files with missing lines	Coverage Δ
...ghq/reggie/runtime/LinearTokenSequenceMatcher.java	80.0% <79.0%> (+3.0%)	⬆️

... and 2 files with indirect coverage changes

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