Add performance benchmark for renderer extension matching

[Copilot]

Adds benchmarking infrastructure for the renderer extension matching logic introduced in #291 and #292, measuring the performance characteristics of the extension sorting and matching operations.

Changes

• benchmarks/RendererMatchingBench.php - Benchmark suite measuring:

  • uksort() overhead for sorting extensions by length (~17.5 μs per operation)
  • str_ends_with() performance for extension matching (~200 ns per operation)
  • End-to-end comparison of sorted vs unsorted matching

• benchmarks/README.md - Documentation covering execution, interpretation, and performance trade-offs

Usage

php benchmarks/RendererMatchingBench.php

Sample output:

1. Extension Sorting Performance (uksort)
   Per operation: 17.5174 μs

2. Extension Matching Performance (str_ends_with)
   'template.blade.php' -> 'blade.php': 201.17 ns/op

3. Overall Matching Performance (sorted vs unsorted)
   Sorted:   1.4706 μs/op
   Unsorted: 0.5746 μs/op

The sorting overhead is acceptable since it occurs once during initialization, while the matching operation remains fast in the hot path.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.14%. Comparing base (40a5e9e) to head (4186a47).

Additional details and impacted files

@@                   Coverage Diff                    @@
##             289-double-extensions     #293   +/-   ##
========================================================
  Coverage                    99.14%   99.14%           
  Complexity                     311      311           
========================================================
  Files                           19       19           
  Lines                          816      816           
========================================================
  Hits                           809      809           
  Misses                           7        7           

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