Add nablatensor to Financial

[petrpravda]

Suggestion type

• Project
• Resource

Checklist

• I searched the list and existing issues for duplicates.
• I changed README_SOURCE.md, not the generated README.md.
• This pull request contains one suggestion.
• The suggestion is relevant to Java or the JVM and fits its chosen category.
• I used the canonical project or resource link.
• The suggestion is current and maintained.
• The concise, neutral description explains its distinguishing value and ends with punctuation.
• Licensing is clear and any restrictive terms are disclosed where applicable.

Adds nablatensor under Financial.

It's an adjoint-automatic-differentiation library for quantitative finance on the JVM: a valuation is recorded once against a scalar type, then replayed from the same tape to get a price and every first-order Greek from one reverse sweep, on CPU, SIMD, or GPU (CUDA/Vulkan/ROCm).

• Apache-2.0, single repo
• On Maven Central (com.nablatensor:nablatensor-core)
• mvn -o test is green with no GPU/native lib/incubator flag (plain-Java cpu-jit backend by default)

Disclosure: I'm the author of nablatensor.

Closest existing neighbor in the list is OpenGamma Strata (market-risk analytics), though nablatensor's focus is the AAD engine + multi-backend replay rather than a market-data/product model library.

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Summary by cubic

Adds nablatensor to the Financial section of README_SOURCE.md. It's an adjoint-automatic-differentiation library for quantitative finance: a valuation is recorded once against a scalar type, then replayed from the same tape to get a price and every first-order Greek from one reverse sweep, on CPU, SIMD, or GPU. Apache-2.0, available on Maven Central as com.nablatensor:nablatensor-core, and mvn -o test passes with the default plain-Java cpu-jit backend. Disclosure: the submitter is the author of nablatensor.

^{Written for commit 491bbca. Summary will update on new commits.}

[cubic-dev-ai]

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