feat(vector): add safe Rust execution core

[vntrevx]

Implements roadmap task M20-03 as a new responsibility-focused nfi-vector-core crate.

• Parses and revalidates indicator-program-v1, including the Python-compatible canonical fingerprint.
• Plans only output-reachable nodes and borrows only requested Arrow columns.
• Defines explicit IEEE f64, NaN, null, signed-zero, and infinity behavior.
• Preserves bounded shift and rolling state across record batches.
• Adds batch-local execution, source-located fail-closed errors, and a discard sink proving bounded retained memory.
• Keeps transport, simulator, filesystem, PyO3, strategy names, Signal numbers, pairs, SHAs, and expected results out of runtime dispatch.

Validation:

• Future compatibility: 134 passed
• Python: 729 passed
• Rust workspace: 169 passed; fmt and Clippy clean
• Actual Python-generated 24-node contract and fingerprint validated by Rust
• Spot and Futures trade surface plus full state exact

Claim boundary: complete NFI indicator and TA-Lib kernels remain M20-04; this PR does not claim the latest strategy is fully Native.

[chatgpt-codex-connector]

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