/claim #1367

What

• Make jsluice parsing optional behind build tags (-tags jsluice + CGO_ENABLED=1).
• Default builds no longer require the go-tree-sitter (CGO) dependency.
• Update README install + usage notes to clarify how to enable -jsl.

Why

Issue #1367: go-tree-sitter is pulled in via jsluice, but jsluice is an optional feature. This isolates the CGO dependency so standard builds succeed without CGO.

Proof

See PR comments / attached proof in the repo.