Alan-Jowett / LexonGraph / 27048375669

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Add directional PCA layer crate (#56)

* Add directional PCA layer crate

Add the directional-PCA spec trifecta, implement the single-layer block-ID partitioning crate, and cover the new behavior with spec-validation tests.

Traceability:
- Requirements: docs/specs/rust-directional-pca-crate/requirements.md
- Design: docs/specs/rust-directional-pca-crate/design.md
- Validation: docs/specs/rust-directional-pca-crate/validation.md

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix cross-platform Cargo paths

Use forward slashes for local path dependencies in the directional-PCA crate manifest so Linux CI can resolve workspace members consistently.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Tighten directional PCA input threshold

Make min_input_count an explicit at-least-two-samples contract to match the PCA requirement, remove the silent runtime clamp, and update the directional-PCA specs and validation tests accordingly.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Refine directional PCA decode errors

Distinguish supported-encoding length overflow from truly unsupported encodings when decoding representative embeddings, and cover the overflow case in spec-validation tests.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

435 of 581 new or added lines in 1 file covered. (74.87%)

5199 of 6122 relevant lines covered (84.92%)

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