chore: establish Aetherbound Guild design boundary

README.md

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+# Aetherbound Guild / 裂脉远征团
+
+An original landscape 2D Japanese hand-drawn guild-expedition strategy game.
+
+This repository is currently in **complete pre-production design**. Formal game
+implementation, bulk final-asset production, packaging, and publishing are
+forbidden until the owner approves the complete product, content, presentation,
+balance, and interactive-design package.
+
+## Current Product Boundary
+
+- 30 named recruitable characters
+- 12 base professions and 24 advanced professions
+- 100 enemy combat identities across 8 chapters
+- 320 equipment and item entries
+- 25-35 hour first campaign, 60-80 hour build completion, roughly 100 hour
+  collection and high-difficulty completion target
+- Landscape 16:9, premium cross-platform target, English and Simplified Chinese
+- 2D Japanese hand-drawn presentation using layered rigs, equipment layers,
+  authored key poses, and unique portraits/illustrations
+
+The game may learn structural lessons from authorized private reference
+research, but its setting, characters, enemies, names, art, audio, UI,
+progression, formulas, and expression must be original.
+
+## Design Package
+
+The design package will be developed under `docs/` and published as a reviewable
+HTML gallery before any formal implementation starts.