Mac-on-Linux: implement keyboard and shortcut equivalence lane for sourceos-shell

[mdheller]

Parent tracker: #77

Summary

Implement the keyboard and shortcut-equivalence lane required for the Mac-on-Linux realization of sourceos-shell.

Goal

Deliver a Linux realization that preserves Mac-style shortcut ergonomics across:

• GUI applications
• terminals
• launcher/search flows
• editor and browser usage
• remote/virtualized sessions where feasible

Relevant substrate clues

The org already contains SociOS-Linux/kinto, which is explicitly aimed at Mac-style shortcut keys on Linux and describes seamless copy/paste behavior for apps and terminals. That makes it a useful substrate/reference for the transitional phase while the shell-native approach matures.

Workstreams

1. Shortcut model

• define the canonical Mac-on-Linux shortcut matrix
• distinguish GUI and terminal semantics explicitly
• preserve shell command-palette behavior and avoid duplicate launcher semantics

2. Transitional substrate path

• evaluate Kinto-derived or equivalent shortcut behavior as a realization/reference lane
• define the migration path from substrate remapping toward shell-native behavior where appropriate

3. Validation

• define acceptance fixtures for copy/paste, tab switching, window switching, and launcher invocation
• document known limitations for Wayland, X11, remote desktop, and virtual input devices

Acceptance criteria

• keyboard/shortcut equivalence goals are explicitly documented
• GUI vs terminal behavior is separated and testable
• transitional substrate path and shell-native migration path are documented
• follow-on Linux realization PRs can reference this issue for keyboard work

Proposed owner

@mdheller