docs(design): add shared design source

[Drixled]

Summary

• Adds the canonical kilo-design repo as a .kilo/design submodule.
• Replaces the local Cloud design rules with a root DESIGN.md entrypoint that points to the shared Cloud overlay and tokens.

Verification

• Reviewed the root DESIGN.md entrypoint paths against the .kilo/design submodule layout.
• Confirmed the submodule is pinned to the initial shared design source commit.

Visual Changes

N/A

Reviewer Notes

The submodule points at Kilo-Org/kilo-design commit acdcc60. Fresh clones should initialize submodules with git submodule update --init --recursive.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

All previously flagged issues are resolved: the HTTPS submodule URL is in place, and both AGENTS.md files now correctly reference DESIGN.md.

Resolved Issues

File	Issue
.gitmodules	✅ SSH URL changed to HTTPS — CI/CD issue fixed
AGENTS.md	✅ design.md reference updated to DESIGN.md
apps/web/AGENTS.md	✅ ../../design.md reference updated to ../../DESIGN.md

Files Reviewed (6 files)

• .gitmodules — 0 issues
• .kilo/design — submodule pointer, 0 issues
• DESIGN.md — 0 issues
• design.md (deleted) — removal reviewed
• AGENTS.md — 0 issues (reference fixed)
• apps/web/AGENTS.md — 0 issues (reference fixed)

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_{Reviewed by claude-4.6-sonnet-20260217 · 162,768 tokens}

_{Review guidance: REVIEW.md from base branch main}