feat: Rust state machine for investigation workflow (fn-17)#75

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Commits on Jan 19, 2026

feat(core): scaffold Rust workspace for investigation state machine

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feat(investigator): add domain types for state machine

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feat(investigator): add Event and Intent protocol types

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feat(investigator): add State struct and Phase enum

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feat(investigator): add state machine logic with Investigator struct

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feat(investigator): add Python bindings for Investigator class

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feat(investigator): add panic-free Python wrappers with custom exceptions

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feat(investigator): integrate Rust bindings with uv workspace

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feat(investigator): create Python package structure

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feat(investigator): add envelope and security modules

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feat(investigator): add runtime module for local execution

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feat: add Temporal workflow integration for Rust state machine

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test: add Python integration tests for investigator package

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test: add E2E workflow tests for Rust state machine integration

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chore: update fn-17.16 task status to done

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feat: add rust orchestration
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fix: remove large text file
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update readme
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