feat(vector): implement exact informative semantics

[vntrevx]

Summary

• pin Freqtrade 2026.5.1 informative merge and resample behavior with a 20-case official oracle
• add modular Rust batch/stream alignment and bounded final forward-fill primitives
• compile the complete static informative call signature and fail closed on unsupported forms

Exactness and safety

• no strategy, Signal, pair, timerange, SHA, or expected-result runtime branches
• explicit pair/timeframe frame identity and no-lookahead visibility
• missing, duplicate, unsorted, custom-date, cross-pair, NaN/null/infinity/signed-zero coverage
• latest X7 still fails closed at strategy.py:3168:21 until M21 runtime config/data-provider and VectorEngine integration

Validation

• Python: 763 passed
• future-NFI compatibility: 134 passed
• Rust workspace: 211 passed; fmt and Clippy -D warnings clean
• Spot and Futures: trade surface and full-state exact

[chatgpt-codex-connector]

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