Add tree-sitter devcontainer feature

[Copilot]

Adds a new devcontainer feature for the tree-sitter CLI — an incremental parsing toolkit for building syntax trees.

Changes

• src/tree-sitter/devcontainer-feature.json — feature metadata, version 1.0.0, version option defaulting to "latest"
• src/tree-sitter/install.sh — installs via gh release zip assets:
  • URL pattern: tree-sitter-cli-linux-{arch}.zip
  • Architecture mapping: amd64→x64, arm64→arm64, armhf→arm, i386→x86
  • Binary lives at zip root (no subdirectory); uses unzip -p extraction
• test/tree-sitter/test.sh — validates tree-sitter --version executes successfully
• README.md — adds tree-sitter row in alphabetically sorted table (between taskwarrior.org and turso.tech)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add feature tree-sitter</issue_title>
<issue_description>https://github.com/tree-sitter/tree-sitter/releases</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add feature tree-sitter #224

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