trading-mcp

## ADDED Requirements ### Requirement: Indicator engine validates inputs The system SHALL validate indicator inputs and reject unsupported indicator names. #### Scenario: Unsupported indicator is rejected - **WHEN** a caller requests an indicator that is not supported - **THEN** the system raises a clear error indicating the indicator is unsupported ### Requirement: Indicator computation produces aligned output The system SHALL compute indicators using TA-Lib and return outputs aligned to the input series length. #### Scenario: Output aligns to input - **WHEN** the engine computes an indicator for an input series of length N - **THEN** the output has length N and preserves input ordering