Port competitor corpora wave 2 and add coverage gate

[konard]

Fixes #63

Summary

• Added wave-two parity targets for ast-grep, Semgrep, Comby, GritQL, srcML, difftastic, Babel, SWC, OpenRewrite, Spoon, JavaParser, Rascal, Stratego/Spoofax, TXL, MPS, Coccinelle, GF, Universal Dependencies, LanguageTool, and doublets-rs.
• Added executable, provenance-bearing sampled fixtures for the new targets, including transform expectations, round-trip reconstruction, recoverable grammar diagnostics, and storage/serialization gates.
• Ratcheted CI coverage with cargo llvm-cov --fail-under-lines 84.30, measured from the current branch at 7506 / 8903 covered lines (84.30866000224644%).
• Updated the parity roadmap and issue We need to carefully compare all competitors in all scopes with out project, and make sure we have the richest features set #47 requirements audit so remaining full-corpus and grammar-scope work is tied to open issues We need to carefully compare all competitors in all scopes with out project, and make sure we have the richest features set #47, Adopt data-exchange format grammars (JSON, YAML, TOML, XML, INI, protobuf, GraphQL) #50, and Wire Perl grammar once a tree-sitter 0.25-compatible binding is available #70.

Reproduction / Tests

Before this branch, the new parity_targets_track_competitor_and_ecosystem_test_sources, wave_two_competitor_corpora_are_sampled_with_expected_fixture_shapes, and coverage_job_enforces_recorded_line_coverage_floor checks fail because the wave-two targets/fixtures and coverage threshold are absent.

Local verification passed:

• cargo fmt --check
• cargo clippy --all-targets --all-features
• cargo test --test unit parity_corpora -- --nocapture
• cargo test --test unit coverage_job_enforces_recorded_line_coverage_floor -- --nocapture
• cargo test --all-features
• cargo llvm-cov --all-features --lcov --output-path experiments/coverage-check.lcov --fail-under-lines 84.30
• rust-script scripts/check-no-src-tests.rs
• RUST_LOG=error rust-script scripts/check-file-size.rs (passes with existing near-limit warnings)
• RUST_LOG=error rust-script scripts/check-crate-size.rs
• RUST_LOG=error rust-script scripts/check-changelog-fragment.rs
• git diff --check

No UI changes; screenshots are not applicable.

[konard]

Working session summary

Implemented and finalized issue #63 in PR #80: #80

What changed:

• Added wave-two parity targets and fixtures for 20 competitor/ecosystem projects.
• Added reproducing fixture/coverage tests.
• Added CI coverage gate at --fail-under-lines 84.30.
• Updated parity roadmap, issue-47 requirements docs, and changelog fragment.
• Merged latest PR base and pushed head 3d9c736.

Verification:

• Local checks passed: cargo fmt, targeted tests, cargo test --all-features, cargo clippy --all-targets --all-features, coverage gate, size/changelog scripts, git diff --check.
• Fresh CI passed: https://github.com/link-foundation/meta-language/actions/runs/27383068861
• PR is ready, mergeable, and clean.

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This summary was automatically extracted from the AI working session output.

[konard]

🤖 Solution Draft Log

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost estimation:

• Model: GPT-5.5
• Provider: OpenAI
• Public pricing estimate: $22.394093

📊 Context and tokens usage:

• 598.0K / 1.1M (57%) input tokens, 62.5K / 128K (49%) output tokens

Total: (598.0K + 13.6M cached) input tokens, 62.5K output tokens, $22.394093 cost

🤖 Models used:

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

📎 Log file uploaded as Repository (85049KB)

• View complete solution draft log

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Now working session is ended, feel free to review and add any feedback on the solution draft.

[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