v0.2.0 - IR v2 experimental

Changelog

[v0.2.0] - 2025-12-16

Added

• IR v2: new richer schema representation (crates/xsql-ir/src/v2.rs) with V2Schema, V2Table, V2Column, V2DataType, constraints, and FK support.
• v2 CLI workflow: v2-parse and v2-emit for parsing SQL -> V2 JSON and emitting SQL from V2 JSON (crates/xsql-cli).
• --strict mode for v2-emit (and conversion/lint), which fails on lossy mappings.
• v2-diff library and CLI: basic structural diff of two V2 schemas (crates/xsql-ir::v2_diff and xsql v2-diff).
• ALTER-generation scaffold (crates/xsql-ir/src/alter.rs) for future ALTER SQL output.
• Tests: parser/emitter v2 roundtrip and edge-case tests.
• CI: GitHub Actions workflow to run fmt, clippy, and tests.

Fixed

• Formatting and clippy issues across the workspace.
• CLI v2-emit strict flag wiring and pattern-match bug.

Notes

• IR v2 is experimental. The V2Schema JSON format is considered unstable and may evolve; use --strict to ensure lossless emit where possible.