feat: add typed-doc for clipboard, test plan, logging, instrumentation

[nottherealalanturing]

Summary

Implementation documentation for four features assigned to nottherealalanturing.

Changes

typed-doc/copy-to-clipboard-feature.tsx (#322)

• Adds a Copy button to RecommendationPanel that copies raw stroop value
• Shows "Copied!" confirmation for 1.5s
• Graceful fallback when clipboard API unavailable

typed-doc/simulation-test-plan.ts (#338)

• Test plan covering fee simulation, recommendation output, clipboard interaction, and structured logging

typed-doc/structured-logging-module.rs (#339)

• tracing-based structured logger with DEVKIT_LOG env var support
• Auto-detects TTY for human vs JSON output

typed-doc/simulation-instrumentation.rs (#340)

• #[tracing::instrument] spans on fee_model, network_load, and congestion_predictor
• Spans include function name, config fields, and sample counts

Closes #322
Closes #338
Closes #339
Closes #340

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