Update lifetime annotations and simplify pinning logic

[jondo2010]

Improve safety documentation and update lifetime annotations for ReactorBuilderState and ReactionBuilderState. Simplify the pinning logic in the store for better clarity and safety.

[codecov]

Codecov Report

❌ Patch coverage is 98.30508% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 76.97%. Comparing base (7030d27) to head (f8f1e77).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
- Coverage   76.98%   76.97%   -0.02%     
==========================================
  Files          49       49              
  Lines        7392     7388       -4     
==========================================
- Hits         5691     5687       -4     
  Misses       1701     1701              

Components	Coverage Δ
boomerang	100.00% <ø> (ø)
boomerang_builder	70.26% <75.00%> (ø)
boomerang_derive	89.06% <ø> (ø)
boomerang_runtime	77.59% <100.00%> (-0.04%)	⬇️
boomerang_tinymap	90.71% <100.00%> (ø)
boomerang_util	23.68% <ø> (ø)

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[Copilot]

Pull Request Overview

This PR improves safety documentation and updates lifetime annotations for builder states while simplifying the pinning logic in the store. The changes focus on making the pinning mechanism more explicit and safe while updating lifetime annotations to be more precise.

• Updated lifetime annotations for ReactorBuilderState and ReactionBuilderState to be more explicit
• Replaced manual PhantomPinned approach with pin-project crate for safer pinning
• Enhanced safety documentation for iter_borrow_storage method with detailed requirements

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
boomerang_tinymap/src/secondary_map/mod.rs	Added explicit lifetime annotation to values() method return type
boomerang_runtime/src/store.rs	Major refactoring to use pin-project instead of manual pinning, enhanced safety documentation
boomerang_runtime/src/refs.rs	Simplified trait bound syntax by removing unnecessary parentheses
boomerang_runtime/src/port/mod.rs	Simplified trait bound syntax by removing unnecessary parentheses
boomerang_runtime/Cargo.toml	Added pin-project dependency for safer pinning
boomerang_builder/src/reactor.rs	Added explicit lifetime annotation to add_reaction return type
boomerang_builder/src/fqn.rs	Fixed import organization by moving runtime import to test module
boomerang_builder/src/env/mod.rs	Added explicit lifetime annotations to builder method return types

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