Add analog simulation analyses and parameter sweep RFC

[ShiboSoftwareDev]

Summary

• add dedicated <analog.*simulation> elements for transient, DC operating point, direct DC sweep, and AC sweep usage
• add one-dimensional component sweeps through a nested <analog.sweepparameter> with parameter-specific target props
• define the Circuit JSON experiments, sweep relationships, and analysis-specific voltage/current result types produced by that TSX
• preserve the existing <analogsimulation> transient spelling and transient graph elements

Scope

This RFC is intentionally limited to TSX usage and the corresponding Circuit JSON. Compiler, engine, scheduling, rendering, export, measurement-expression, and implementation-order contracts are outside its scope.

Validation

• parsed all embedded JSON examples
• git diff --check

[seveibar]

keep the RFC small and focused on circuit json and TSX usage examples- the spec is far more important than anything else and the RFC doesn't focus sufficiently on it. Also the RFC should be smaller

Make sure you understand every line, remove lines like this (they waste the time of the reviewer)

The ngspice adapter must serialize access to one cached mutable simulation
instance. Parallelism is valid only through a bounded pool of independent
instances; a worker pool is not part of MVP.

[seveibar]

yep looks good

[tscircuitbot]

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Impact: Major

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