Implement GuidedAmplitude

[goerz]

Implements an amplitude that is a control relative to an existing reference.

[codecov]

Codecov Report

❌ Patch coverage is 99.00990% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.8%. Comparing base (45a992f) to head (270fbff).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/amplitudes.jl	99.1%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #111     +/-   ##
========================================
+ Coverage    90.5%   90.8%   +0.4%     
========================================
  Files          37      37             
  Lines        2661    2762    +101     
========================================
+ Hits         2407    2507    +100     
- Misses        254     255      +1     

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[Copilot]

Pull request overview

Adds a new GuidedAmplitude type to express an amplitude as a shaped control offset by a reference/guide, fitting into the existing Amplitudes module alongside LockedAmplitude and ShapedAmplitude.

Changes:

• Export and implement GuidedAmplitude with constructors, show, evaluate, Array, and substitute support.
• Add extensive tests covering callable/vector combinations, number guides, invalid constructions, and substitution behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/amplitudes.jl	Implements and exports GuidedAmplitude and its evaluation/substitution behavior.
test/test_amplitudes.jl	Adds coverage for GuidedAmplitude construction and evaluation modes, plus error cases.

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