Adopt external parity fixtures

[konard]

Fixes #19

Summary

• Expand PARITY_FIXTURES with multiple upstream-provenanced fixtures for tree-sitter, LibCST, Recast, jscodeshift, Rowan, cstree, and Roslyn.
• Add fixture-level verification expectations for clean versus recoverable parses, plus executable query/transform expectations.
• Strengthen the parity unit tests to validate provenance, recovery diagnostics, transform output, capability coverage, and multiple external fixtures per competitor target.
• Update the README, parity roadmap, and minor changelog fragment for the expanded fixture registry.

Reproduction

• Before this branch, a guard requiring multiple ported fixtures for tree-sitter, LibCST, Recast, jscodeshift, Rowan, cstree, and Roslyn fails because the registry only had one illustrative fixture per target.
• The new tests/unit/link_network.rs::external_competitor_corpora_contribute_multiple_fixtures test captures that gap, and the extended core contract test verifies provenance, recovery, and transform behavior.

Verification

• cargo fmt --check
• cargo clippy --all-targets --all-features
• cargo test --all-features
• rust-script scripts/check-no-src-tests.rs
• rust-script scripts/check-file-size.rs (passes with existing soft warnings for src/query.rs, src/link_network.rs, and tests/unit/link_network.rs above 900 lines)
• rust-script scripts/check-crate-size.rs
• rust-script scripts/check-changelog-fragment.rs
• git diff --check

Release

• Added a bump: minor changelog fragment.

[konard]

Working session summary

Done. PR #35 is ready for review: #35

Implemented the issue by expanding PARITY_FIXTURES into upstream-provenanced competitor corpora in src/parity_fixtures.rs, adding clean/recoverable and query/transform expectations in src/parity.rs, and strengthening executable parity tests in tests/unit/link_network.rs. Also updated docs and added a bump: minor changelog fragment.

Verification passed locally:
cargo fmt --check, cargo clippy --all-targets --all-features, cargo test --all-features, check-no-src-tests, check-file-size, check-crate-size, check-changelog-fragment, and git diff --check.

Latest CI/CD run 27103799903 passed on head 8aaedc8; PR merge state is clean and the working tree is clean.

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[konard]

🤖 Solution Draft Log

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💰 Cost estimation:

• Model: GPT-5.5
• Provider: OpenAI
• Public pricing estimate: $12.113878

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• 296.4K / 1.1M (28%) input tokens, 48.3K / 128K (38%) output tokens

Total: (296.4K + 7.0M cached) input tokens, 48.3K output tokens, $12.113878 cost

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• Tool: OpenAI Codex
• Requested: gpt-5.5
• Model: GPT-5.5 (gpt-5.5)

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[konard]

🎉 Auto-merged

This pull request has been automatically merged by hive-mind.

• All CI checks have passed

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Auto-merged by hive-mind with --auto-merge flag