v0.1.2

Added

• Optional tracing feature across the workspace:
  • borsa, borsa-core, and borsa-yfinance expose a tracing feature flag
  • Router entry points and core orchestration in borsa emit spans when enabled
  • borsa-yfinance instruments all public provider endpoints (quotes, history, search, profile, fundamentals, options, analysis, holders, ESG, news, streaming)
• New example examples/examples/00_tracing.rs showing how to initialize tracing_subscriber and view spans

Documentation

• Updated README.md, borsa/README.md, and borsa-yfinance/README.md describing observability usage and run commands

Fixed

• router: stream startup now fails if any connector fails to initialize, aborting
  spawned tasks and returning a consolidated error instead of partially starting.
• router/info: suppress warnings for optional data in info report by filtering
  out Unsupported and NotFound errors; only actionable errors are retained.
• router/history: validate per-provider candle currencies; error on inconsistent
  series; ignore providers with no currency data when determining majority currency.
• router/search: return Unsupported when no providers support the requested
  capability; ignore non-attempted connectors in result merging and error
  aggregation.
• core: correct merge_history adjusted flag semantics to gate on the first
  contributing response and require all contributing responses to be adjusted.
• core: ensure merge_history.meta falls back to the first available meta when
  no candles contribute to the merged series, preserving timezone context.
• borsa-mock: replace blocking std::thread::sleep with non-blocking
  tokio::time::sleep in TIMEOUT simulation to avoid blocking the async runtime.

Dependencies

• Bump paft to v0.5.2.
• Bump yfinance-rs to v0.5.2.
• Bump syn to v2.0.107.