Adopt explicit namespace punctuation

[shunichironomura]

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Summary

• synchronize Graphcal highlighting with the explicit :: member and # index-label syntax
• highlight categorized DAG input bindings, public whole-DAG imports, qualified calls, and inline DAG output projections
• point the extension grammar at the companion Tree-sitter branch
• bump the Zed extension version to 0.0.8

Depends on graphcal-lang/tree-sitter-graphcal#58 and accompanies graphcal-lang/graphcal#1505.

Verification

• cargo check --locked
• cargo fmt --check
• confirmed the committed highlight query matches the Tree-sitter query byte-for-byte

AI assistance

• AI used: yes — an AI coding agent synchronized the query, dependency revision, metadata, and validation
• Human review of AI-assisted code: pending