fix(continual-learning): declare IParameterizable on EWC/SI test mock model

[ooples]

Summary

Fixes the continual-learning cluster in the Integration C shard from the PR #1563 failing-CI list — 14 ElasticWeightConsolidation / SynapticIntelligence deep-math integration tests (in my hand-off lane from #1562; does not touch any files #1562 owns).

Root cause (one shared bug): the interface-segregation refactor moved GetParameters / SetParameters / ParameterCount / WithParameters off IFullModel onto the separate IParameterizable interface. EWC and SI guard-require it via InterfaceGuard.Parameterizable — correctly, since EWC's Fisher information matrix and SI's per-parameter importance are both computed over the model's parameters, so a model with no trainable parameters cannot participate. The CLMockModel test fixture still declared only IFullModel, so the runtime model is IParameterizable<...> check failed:

System.InvalidOperationException : CLMockModel does not implement IParameterizable<Double, Tensor, Tensor>.
This operation requires a model with trainable parameters.
   at AiDotNet.ContinualLearning.Strategies.SynapticIntelligence.PrepareForTask(...)

Fix: declare IParameterizable<double, Tensor<double>, Tensor<double>> on CLMockModel. The mock already implements every member of that interface (GetParameters, SetParameters, ParameterCount, SupportsParameterInitialization, WithParameters, SanitizeParameters) — it just needed to declare it so the cast succeeds.

This is a fixture completing an interface it already implements. No production code is changed, and no assertion or expected value is weakened — the production requirement (EWC/SI need IParameterizable) is correct and stays.

Verification

All 36 ContinualLearningDeepMathIntegrationTests pass locally (net10.0, Release) — the 14 previously-failing EWC/SI tests plus the 22 that already passed.

🤖 Generated with Claude Code

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[ooples]

Consolidated into #1565 (single PR for the PR #1563 CI-failure lane, per request). Branch retained but superseded.