fix(release): sync Cargo crate version with npm/GitHub release version

[systemfsoftware-maker]

Problem

comment-checker --version reports 0.1.0 while npm and GitHub releases are at 0.1.7.

Cargo.toml [workspace.package] version and crates/comment-checker/Cargo.toml have never been bumped — release-version.ts only bumped npm/packages/comment-checker/package.json, so every cargo build in platform.yml embeds the stale 0.1.0 and tag-released-packages.ts tags it as v0.1.7.

Fix

• Bump Cargo.toml and crates/comment-checker/Cargo.toml to 0.1.7 (drift repair)
• Make release-version.ts bump all crates/*/Cargo.toml alongside npm so future releases stay locked — comment-checker --version will match the GitHub tag
• Add scripts/tools/check-versions.ts and wire into tools.yml to fail PRs on Cargo-vs-npm divergence

Verification

• cargo run -- --version → 0.1.7 (was 0.1.0)
• ./scripts/tools/check-versions.ts → ok npm=0.1.7 workspace=0.1.7
• Divergence probe: temp bump Cargo to 0.1.8 → check-versions exits 1 with Cargo.toml workspace 0.1.8 != npm 0.1.7
• release-version.ts probe: fake .changeset/probe.md (patch) → Cargo + npm both 0.1.8
• cargo fmt --check && cargo clippy --all-targets -- -D warnings && cargo test --all-targets green

Plan: docs/plans/2026-08-25-002-fix-version-sync-cargo-npm.md

Fixes: self-reported version mismatch with GitHub release.