test(e2e): Add neural-network integration test.

[sitaowang1998]

Description

This PR adds neural-network integration test, with the following change:

• tests/huntsman/e2e/src/nn: New mod contains neural network helpers.
  • neuron.rs: Neuron activation enums and mapping to task name and evaluate function.
  • wiring.rs: Wiring outputs to inputs.
  • network.rs: NeuralNetwork struct that holds all neural network information and conversion to TaskGraph.
• tests/huntsman/e2e/payload_serde.rs: Helpers that serialize/deserialize task msgpack input/output payload.
• taskfiles/test.yaml: Excludes e2e tests from test:rust-unit-tests task.

Checklist

• The PR satisfies the contribution guidelines.
• This is a breaking change and that has been indicated in the PR title, OR this isn't a
  breaking change.
• Necessary docs have been updated, OR no docs need to be updated.

Validation performed

• Run neural network test on a Spider stack. The test codes are in another branch.
• GitHub workflows pass.

Summary by CodeRabbit

• New Features
  • Added an end-to-end neural-network workflow with layered neuron graphs, deterministic wiring, and support for multiple activation functions.
  • Added MessagePack payload encoding/decoding for task inputs and outputs.
• Tests
  • Introduced an async end-to-end test that submits the generated network to Spider and verifies returned outputs match in-process simulation.
• Bug Fixes
  • Updated the standard test executor to exclude end-to-end tests, avoiding duplicate execution.

[coderabbitai]

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Walkthrough

Adds a layered neural-network workload to the Huntsman e2e crate, including deterministic wiring, MessagePack payload helpers, Spider execution validation, and exclusion of e2e tests from the unit-test executor.

Changes

Neural network end-to-end validation

Layer / File(s)	Summary
Network model and deterministic wiring tests/huntsman/e2e/Cargo.toml, tests/huntsman/e2e/src/lib.rs, tests/huntsman/e2e/src/nn/*	Defines activation mappings, validates and generates deterministic layer wiring, and provides task-graph construction plus in-process simulation.
MessagePack payload codec tests/huntsman/e2e/src/payload_serde.rs	Adds input encoding and output decoding with round-trip, floating-point, struct, multi-value, and malformed-payload tests.
Spider-backed network validation tests/huntsman/e2e/tests/nn.rs, taskfiles/test.yaml	Adds a deterministic asynchronous Spider comparison test and excludes e2e tests from the standard unit-test executor.

Estimated code review effort: 4 (Complex) | ~45 minutes

Sequence Diagram(s)

sequenceDiagram
  participant test_nn
  participant NeuralNetwork
  participant SpiderTestDriver
  participant Spider
  test_nn->>NeuralNetwork: simulate deterministic inputs
  test_nn->>NeuralNetwork: build task graph
  test_nn->>SpiderTestDriver: submit graph and encoded inputs
  SpiderTestDriver->>Spider: execute dense-neuron tasks
  Spider-->>SpiderTestDriver: return outputs
  SpiderTestDriver-->>test_nn: decode output payload
  test_nn->>test_nn: compare outputs with simulation

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Possibly related PRs

• y-scope/spider#377: Adds the huntsman-nn-core implementations and neuron::dense_* task wrappers exercised by this e2e stack.
• y-scope/spider#379: Provides the SpiderTestDriver infrastructure used by the new e2e network test.

Suggested reviewers: linzhihao-723

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding a neural-network end-to-end integration test.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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