feat: add Obsidian frontmost note support

[johnyoonh]

Summary

• add Obsidian as a supported editor option
• use Obsidian's official CLI to resolve the frontmost active note when Obsidian is focused
• open terminal actions in the active note's directory and editor actions with the active note file
• add an iTerm-specific Obsidian path launch path so iTerm receives the resolved directory reliably
• document the CLI lookup paths and Finder fallback behavior

Details

OpenInTerminal checks Obsidian's bundled obsidian-cli first, then common Homebrew CLI locations. If the CLI is unavailable, cannot resolve the active file, or the resolved file does not exist under the active vault, OpenInTerminal falls back to the existing Finder-based behavior.

Verification

• xcrun swiftc -typecheck OpenInTerminalCore/*.swift OpenInTerminalCore/Extensions/*.swift OpenInTerminalCore/ScriptingBridge/*.swift
• git diff --check
• xcodebuild -workspace OpenInTerminal.xcworkspace -scheme OpenInTerminal -configuration Debug -destination 'platform=macOS,arch=arm64' -derivedDataPath /tmp/OpenInTerminalDerivedDataCli CODE_SIGNING_ALLOWED=NO COMPILER_INDEX_STORE_ENABLE=NO build\n- Manual: with Obsidian frontmost and an active note in a nested directory, Ctrl+Shift+Cmd+O opened Terminal in the active note parent directory\n- Manual: direct iTerm launch created an iTerm window in the active note parent directory\n- Manual: editor launch generated an open command targeting the active note file\n