[OC-060] Add desktop entry, completions, and man pages

[tcballard]

Gate: G5 — Packaging, hardening, and release

Planning source: validated implementation plan PR #1

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• Depends on: OC-022, OC-024, OC-059.
• Deliverable: terminal .desktop entry, shell completions, omachat(1), omachat-ctl(1), omachatd(8), and omachat-protocol(7).
• Acceptance: launcher opens the TUI on clean Omarchy; every CLI option/IPC stability promise is documented; man-page checks run in CI.
• Excludes: modifying user Hyprland configuration.

Maintainer reconciliation — 2026-09-04

Next closure evidence/work: Validate launcher on clean Omarchy and reconcile every current CLI option/protocol promise with manuals/completions.

Baseline reviewed: main 87c3bcb7d65e3e2ab8ae317694b751f8efe9a8ed. Implementation presence is not a live conformance claim.