[Apurv-Salunke]

Summary

• Missing/invalid fields on public instrument types (Index, Equity, Future, Option, …) now raise ConfigurationError with a short usage example instead of a raw Pydantic ValidationError.
• Compact __repr__ forms: Index(NSE:NIFTY), Future(NFO:NIFTY 2026-03-27), Option(NFO:NIFTY 25000 CE 2026-03-27).
• Valid construction unchanged; class docstrings include canonical examples.
• Closes Friendlier instrument construction errors and REPL hints #78.

Test plan

• make ci locally (ruff, mypy, 361 tests, coverage ≥64%)
• tests/unit/test_instrument_models.py — missing fields, invalid type wrap, valid construction, reprs
• Manual REPL: Index() shows example; Index(exchange=Exchange.NSE, symbol="NIFTY") prints Index(NSE:NIFTY)

Risk notes

• Callers catching bare pydantic.ValidationError around instrument construction will need to catch ConfigurationError / TTConnectError instead. Valid construction and resolve-time behaviour are unchanged.

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📥 Commits

Reviewing files that changed from the base of the PR and between 15eb5cb and 672c5ea.

📒 Files selected for processing (3)

• CHANGELOG.md
• tests/unit/test_instrument_models.py
• tt_connect/core/models/instruments.py

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