Progress docs: target-app parity, gaps, alpha gate, readiness by audience (#100)

Progress docs per craftrules standards/progress-docs.md: target-app parity, gaps, roadmap with alpha gate, readiness by audience (full / mainstream / essentials) with Opus 5.5 hours, and auto layout, components, prototyping, dev mode, collaboration, format, hardware, UI and localization parity docs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/parity-checklist.md

@@ -0,0 +1,15 @@
+# Parity checklist
+
+> **Generated:** 2026-10-11 by `cargo xtask parity`. Do not edit by hand.
+
+FigCraft commands registered for the incumbent's main menu and toolbar (455 commands in the engine).
+
+**200 / 203 menu items (98.5%)**
+
+## Missing
+
+- `file.openRecent`
+- `view.outlinesSelection`
+- `view.maskOutlines`
+
+Menu coverage measures breadth only; see docs/target-app-parity.md for depth and fidelity.