feat: extract component docs for tool description

[Mossaka]

Closese #22

[Copilot]

Pull Request Overview

This PR adds support for extracting and utilizing embedded documentation from WebAssembly components, improving tool descriptions with documentation from WIT source files instead of auto-generated placeholders.

• Extracts package documentation from the 'package-docs' custom section in WASM components
• Adds new API functions to generate schemas and tools using extracted documentation
• Updates build process to inject documentation into WASM components during build

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
crates/wassette/src/lib.rs	Updates ComponentInstance to store package docs and use docs-aware schema generation
crates/component2json/src/lib.rs	Adds core functionality for extracting and using package docs in schema generation
crates/component2json/cmd/main.rs	Updates CLI tool to use package docs when available
crates/component2json/Cargo.toml	Adds wasmparser and wat dependencies for WASM parsing and testing
Justfile	Adds wit-docs-inject installation and doc injection steps to build process
.github/workflows/examples.yml	Installs wit-docs-inject in CI workflow

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