Improve fiber state management in blocks

[bdurand]

Changed

• Replaced thread local variables with fiber local variables to prevent behavior from leaking across fibers.

[Copilot]

Pull request overview

This PR improves fiber state management by replacing thread-local variables with fiber-local variables to prevent behavior from leaking across fibers when caching is disabled within a block. Additionally, it adds support for setting the cache to an in-memory cache using true as a shorthand.

Key changes:

• Introduced a new FiberLocals class to manage fiber-scoped variables with proper isolation
• Refactored cache disable/enable mechanisms to use fiber locals instead of thread locals
• Added support for support_table_cache = true as an alias for :memory cache

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
lib/support_table_cache/fiber_locals.rb	New utility class implementing fiber-local variable storage with mutex-based synchronization
lib/support_table_cache.rb	Refactored to use FiberLocals instead of Thread.current.thread_variable_*, added support for true value in cache assignment, updated testing! and cache checking logic
spec/support_table_cache/fiber_locals_spec.rb	Comprehensive test suite for FiberLocals covering fiber isolation, thread safety, nested blocks, and memory cleanup
spec/support_table_cache_spec.rb	Added test case for setting cache to memory cache using true
CHANGELOG.md	Added version 1.1.5 release notes documenting the fiber locals change and true cache assignment feature
VERSION	Bumped version from 1.1.4 to 1.1.5
README.md	Added table of contents and reorganized companion gems section with tip callout
AGENTS.md	New file with detailed Copilot instructions for the project
Rakefile	Removed YARD, appraisal, and standard rake tasks
.github/workflows/continuous_integration.yml	Updated commands for standardrb and yard to run directly instead of via rake

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