check in AGENTS.md, xtask

[schell]

• Add cargo xtask wgsl-spec toc to list the WGSL spec table of contents
• Add cargo xtask wgsl-spec section to fetch specific sections by anchor ID
• Supports --shallow flag to omit subsections and optional argument for direct subsection access
• Enables AI agents to query the WGSL spec without overflowing context windows

[Copilot]

Pull request overview

This PR adds developer tooling for AI agents working with the wgsl-rs codebase. It introduces a new xtask crate that provides command-line utilities to fetch and display WGSL specification content, along with documentation updates to guide agent usage.

• Adds a new xtask crate with commands to query the WGSL specification
• Updates workspace configuration to include the new crate and required dependencies
• Documents the new tooling in AGENTS.md with usage examples

Reviewed changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
crates/xtask/src/main.rs	Implements the xtask CLI tool with WGSL spec fetching commands
crates/xtask/Cargo.toml	Defines the xtask package with dependencies for HTTP requests and HTML parsing
Cargo.toml	Adds xtask to workspace members and includes new shared dependencies
Cargo.lock	Locks all transitive dependencies for the new packages
AGENTS.md	Documents the xtask commands and updates workspace description
.gitignore	Removes AGENTS.md from gitignore to check it in
.cargo/config.toml	Adds cargo alias for xtask and workspace directory environment variable

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