Alan-Jowett / LexonGraph / 27305293472

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Add overlay block store crate (#83)

* Add overlay block store crate

Add the rust-overlay-block-store spec package and a new lexongraph-block-store-overlay crate implementing layered reads, writes, enumeration, and optional post-operation notifications.

Traceability:
- Requirements: docs/specs/rust-overlay-block-store/requirements.md
- Design: docs/specs/rust-overlay-block-store/design.md
- Validation: docs/specs/rust-overlay-block-store/validation.md

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

* Address overlay review feedback

Tighten the overlay invariant panic message to reflect the two-layer construction guard and clean up the inherited-requirements wording in the overlay spec.

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

* Address overlay review comments

Align spec-validation test names with their validation IDs and surface highest-priority enumeration startup failures from iter_block_ids().

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>

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