Add obsidian-cli feature

[Copilot]

Adds a new devcontainer feature for Yakitrak/obsidian-cli — a headless CLI for managing Obsidian vaults without the GUI.

Changes

• src/obsidian-cli/ — new feature using the gh release install method; downloads the notesmd-cli binary (project was renamed upstream) and installs it as obsidian-cli in /usr/local/bin
• test/obsidian-cli/test.sh — verifies obsidian-cli --version runs successfully
• README.md — new row added alphabetically between nvidia.com/cuda and opencode.ai

Usage

"features": {
    "ghcr.io/devcontainer-community/devcontainer-features/obsidian-cli:1": {}
}

Note: The upstream repo (Yakitrak/obsidian-cli) was renamed to notesmd-cli; GitHub redirects the release downloads transparently. The binary is installed as obsidian-cli for a consistent user-facing command name.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add obsidian-cli feature</issue_title>
<issue_description></issue_description>

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

• Fixes Add obsidian-cli feature #174

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