Alan-Jowett / LexonGraph / 27358969509

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Add read-only zip block store (#85)

* Add read-only zip block store

Add the rust-zip-block-store spec package and implement lexongraph-block-store-zip as a read-only BlockStore over a single zip archive.\n\nThe crate resolves blocks from the existing sharded archive layout, ignores unrelated entries, fails explicitly for duplicate recognized paths, and rejects put with a read-only backend failure.\n\nTraceability:\n- Requirements: REQ-ZIP-STORE-001..009\n- Design: DSG-ZIP-STORE-001..009\n- Validation: VAL-ZIP-STORE-001..011

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

* Address PR review feedback

Align the validation test name with the spec, harden EOCD detection to require a record that ends at EOF, and fail explicitly when ZIP64 sentinel fields are encountered during duplicate-entry scanning.\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Improve zip archive scanning

Make duplicate-entry detection read only the EOCD search window and central-directory region instead of loading the whole archive, validate the duplicate-scan path during construction so unsupported archives fail fast, and clarify that ZIP64 archives are unsupported by ZipBlockStore as a whole.\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Harden zip-store bounds and docs

Validate central-directory bounds before allocation, document zip64 as out of scope for the zip block-store spec package, and strengthen the validation test so it checks the spec package and explicit non-conformance/read-only statements.\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Reject ZIP64 locator records

Reject archives that carry a ZIP64 end-of-central-directory locator and add spec-validation coverage for constructor rejection of unsupported ZIP64 inputs.\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Alan Jowett <alan.jowett@microsoft.com>
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