Add Makie extension for circuit visualization

[Krastanov]

Summary

• Adds affectedqubits function using Moshi pattern matching to query qubit indices affected by operations
• Creates PBCCompilerMakieExt package extension for circuit visualization when Makie is loaded
• Implements circuitplot, circuitplot!, and circuitplot_axis functions
• Gates rendered as colored rectangles spanning affected qubits with horizontal wire lines

Features

• Gate visualization: Colored rectangles by operation type (Pauli=green, Measurement=red, etc.)
• Qubit wires: Horizontal black lines for each qubit
• Annotations: Measurement results show classical bit index, conditional ops show dependency
• Configurable: Gate width, qubit spacing, colors all adjustable via Makie attributes
• PrepMagic: Not visualized (placeholder for future implementation)

Test plan

• Tests for affectedqubits on all CircuitOp variants
• Tests for circuit-level affectedqubits
• Existing tests still pass
• Manual visual verification of plots (extension only loads with Makie)

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 94.23077% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.60%. Comparing base (3ada356) to head (d5435e8).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
ext/PBCCompilerMakieExt/PBCCompilerMakieExt.jl	93.25%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master       #5       +/-   ##
===========================================
+ Coverage   55.26%   78.60%   +23.34%     
===========================================
  Files           2        4        +2     
  Lines          76      187      +111     
===========================================
+ Hits           42      147      +105     
- Misses         34       40        +6     

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