Extract Autowire utility for shared eligibility checks

[Firehed]

Summary

• Extracts autowire eligibility logic into a reusable Autowire class
• Updates DevContainer and AutowiredValue to use the shared utility
• Filters out Closure and Generator types which cannot be autowired

API

// Check if a class can be fully autowired
Autowire::isEligible(MyService::class); // bool

// Check if a single parameter can be autowired  
Autowire::isParameterAutowirable($reflectionParam); // bool

// Get the type name for a required param (throws if not autowirable)
Autowire::getRequiredDependencyType($param, $declaringClass); // class-string

Motivation

This prepares for #77 (config generator) which needs to check autowire eligibility. Rather than duplicate the logic, this extracts it into a shared utility that all autowiring code can use.

Test plan

• Existing tests pass (DevContainer, Compiler behavior unchanged)
• New unit tests for Autowire utility

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.00%. Comparing base (acf276d) to head (20e14a8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #79      +/-   ##
============================================
+ Coverage     80.97%   82.00%   +1.03%     
- Complexity      196      207      +11     
============================================
  Files            26       27       +1     
  Lines           594      617      +23     
============================================
+ Hits            481      506      +25     
+ Misses          113      111       -2     

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