fix: strip trailing comments when extracting Cargo.toml version (#26)

* fix: strip trailing comments when extracting Cargo.toml version

The sed pattern in check/tag-version only matched up to the closing
quote but didn't consume the rest of the line, so the release-please
comment suffix (# x-release-please-version) leaked into the extracted
version string, failing the tag comparison.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: use cargo metadata + jq to extract version from Cargo.toml

Replaces fragile sed parsing with structured JSON output from cargo,
avoiding issues with inline comments like the release-please version
annotation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: korniltsev-grafanista

Makefile

@@ -55,7 +55,7 @@ mac/arm64:
 .PHONY: check/tag-version
 check/tag-version:
 	@TAG_VERSION=$${TAG#python-}; \
-	CARGO_VERSION=$$(sed -n 's/^version = "\(.*\)"/\1/p' rust/Cargo.toml); \
+	CARGO_VERSION=$$(cd rust && cargo metadata --no-deps --format-version 1 | jq -r '.packages[0].version'); \
 	if [ "$$TAG_VERSION" != "$$CARGO_VERSION" ]; then \
 		echo "error: tag version ($$TAG_VERSION) does not match Cargo.toml version ($$CARGO_VERSION)"; \
 		exit 1; \