fix: expose bitcode helpers and update QIR 2 fixtures

[qartik]

Summary

• Expose create_memory_buffer_from_bytes, memory_buffer_to_owned_bytes, and parse_bitcode_module as supported Rust helpers for the public bitcode byte boundary.
• Clarify that parse_bitcode_module is a copied-buffer parser path, not a raw/wrapped LLVM bitcode classifier or malformed-input diagnostic layer; downstream callers should keep pre-parse diagnostics before calling it.
• Validate QIR version pairs so QIR 2.1 is accepted while unsupported pairs like QIR 1.1 still fail explicitly.
• Update QIR 2 fixture metadata and snapshots from qir_minor_version = 0 to qir_minor_version = 1.

Fixes #78
Fixes #79

Testing

• cargo test --lib bitcode
• make lint
• make test

[Copilot]

Pull request overview

This pull request updates the crate’s supported public bitcode boundary in Rust and aligns QIR 2 fixtures with QIR version 2.1 by (a) exposing reusable LLVM memory-buffer/bitcode helpers, (b) validating QIR major/minor pairs (accepting 2.1 while still rejecting unsupported pairs like 1.1), and (c) updating QIR 2 fixture metadata and snapshots to qir_minor_version = 1.

Changes:

• Expose create_memory_buffer_from_bytes, memory_buffer_to_owned_bytes, and parse_bitcode_module as public Rust APIs for working with “public” bitcode bytes.
• Update module-flag validation to accept QIR version pairs (1.0, 2.0, 2.1) and explicitly reject unsupported combinations (e.g., 1.1).
• Bump QIR 2 fixture/module-flag minor versions from 0 to 1 across fixture sources and snapshots.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/lib.rs	Exposes bitcode/memory-buffer helpers publicly; adds QIR version-pair validation and tests for 1.1 rejection / 2.1 acceptance.
tests/data/qir2_base.ll	Updates module flags to QIR 2.1 (qir_minor_version = 1).
tests/data/qir2_adaptive.ll	Updates module flags to QIR 2.1 (qir_minor_version = 1).
tests/data/dynamic_result_mixed_array_output.ll	Updates module flags to QIR 2.1 (qir_minor_version = 1).
tests/data/dynamic_result_array.ll	Updates module flags to QIR 2.1 (qir_minor_version = 1).
tests/data/dynamic_result_alloc.ll	Updates module flags to QIR 2.1 (qir_minor_version = 1).
tests/data/dynamic_qubit_array_ssa.ll	Updates module flags to QIR 2.1 (qir_minor_version = 1).
tests/data/dynamic_qubit_array_checked.ll	Updates module flags to QIR 2.1 (qir_minor_version = 1).
tests/data/dynamic_qubit_alloc.ll	Updates module flags to QIR 2.1 (qir_minor_version = 1).
tests/data/dynamic_qubit_alloc_checked.ll	Updates module flags to QIR 2.1 (qir_minor_version = 1).
tests/snaps/qir2_base.ll.snap	Updates snapshot module flags to QIR 2.1 minor version.
tests/snaps/qir2_adaptive.ll.snap	Updates snapshot module flags to QIR 2.1 minor version.
tests/snaps/dynamic_result_mixed_array_output.ll.snap	Updates snapshot module flags to QIR 2.1 minor version.
tests/snaps/dynamic_result_array.ll.snap	Updates snapshot module flags to QIR 2.1 minor version.
tests/snaps/dynamic_result_alloc.ll.snap	Updates snapshot module flags to QIR 2.1 minor version.
tests/snaps/dynamic_qubit_array_ssa.ll.snap	Updates snapshot module flags to QIR 2.1 minor version.
tests/snaps/dynamic_qubit_array_checked.ll.snap	Updates snapshot module flags to QIR 2.1 minor version.
tests/snaps/dynamic_qubit_alloc.ll.snap	Updates snapshot module flags to QIR 2.1 minor version.
tests/snaps/dynamic_qubit_alloc_checked.ll.snap	Updates snapshot module flags to QIR 2.1 minor version.

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