Add external padding, pad_to structure

[JobDoesburg]

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[Copilot]

Pull request overview

This PR adds “structure” descriptors and pad_to APIs to normalize long pseudonyms/attributes/records (and JSON values) to a consistent block shape, enabling batch transcryption without leaking length/shape differences (unlinkability). It also introduces JSON structure unification helpers for computing a common target shape across multiple values.

Changes:

• Add pad_to(...) and structure() for LongPseudonym, LongAttribute, and LongRecord (plus WASM + Python bindings).
• Add PEPJSONValue::{structure, pad_to} and expose unify_structures through WASM/Python.
• Add LongRecordStructure / wrapper classes and a macro entry point for standalone pep_json!(pseudonym(...)).

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/lib/data/long.rs	Implements external-padding pad_to, updates decoding to try to strip external padding, adds tests.
src/lib/data/records.rs	Adds LongRecordStructure, plus LongRecord::{structure, pad_to}.
src/lib/data/json/structure.rs	Introduces UnifyError and unify_structures for JSON structure descriptors, with tests.
src/lib/data/json/data.rs	Adds PEPJSONValue::{structure, pad_to} + new JSON padding-related errors and tests.
src/lib/data/json/macros.rs	Adds standalone pep_json!(pseudonym(...)) macro arm.
src/lib/data/wasm/long.rs	Exposes padTo for long pseudonyms/attributes in WASM.
src/lib/data/wasm/records.rs	Exposes LongRecordStructure, LongRecord.structure(), and LongRecord.padTo() in WASM.
src/lib/data/wasm/json.rs	Exposes structure(), padTo(), and unifyStructures() in WASM.
src/lib/data/py/long.rs	Exposes pad_to for long pseudonyms/attributes in Python.
src/lib/data/py/records.rs	Exposes LongRecordStructure, LongRecord.structure(), and LongRecord.pad_to() in Python.
src/lib/data/py/json.rs	Exposes structure(), pad_to(), and unify_structures() in Python.

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[Copilot]

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated 4 comments.

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[Copilot]

Pull request overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 19 out of 19 changed files in this pull request and generated 2 comments.

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