feat: Implement PrsHub StreamHub for dual-provider streaming indicators

[Copilot]

Implements StreamHub support for Price Relative Strength (PRS), completing P006 from the streaming indicators plan. PRS compares two independent series (eval vs base), requiring a dual-provider pattern not previously used in the streaming framework.

Implementation

Dual-provider architecture

• PrsHub subscribes to eval provider, maintains reference to base provider
• Cache synchronization via on-demand refresh in ToIndicator()
• Supports optional lookback periods for PRS percent calculation

Key pattern

// Usage requires coordinated updates to both providers
QuoteHub evalHub = new();
QuoteHub baseHub = new();
PrsHub indicator = evalHub.ToPrsHub(baseHub, lookbackPeriods: 14);

// Base must update before eval to maintain cache consistency
baseHub.Add(baseQuote);
evalHub.Add(evalQuote);  // Triggers PrsHub calculation

Testing

• Comprehensive StreamHub test suite with rollback validation
• Chaining tests as both observer and provider
• Performance benchmark added to StyleComparison suite

Files changed

• src/m-r/Prs/Prs.StreamHub.cs - StreamHub implementation
• tests/indicators/m-r/Prs/Prs.StreamHub.Tests.cs - Test coverage
• tools/performance/Perf.StyleComparison.cs - Benchmark integration
• docs/plans/streaming-indicators.plan.md - Mark P006 complete

Original prompt

On streaming-indicators.plan.md, Implement P006 in streaning indicatore plan. mark it completed when done.

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[DaveSkender]

On hold, since we moved this to backlog:

• PairsHub type for Beta, Corr, Prs, etc. #1827