docs: convert DESIGN.md into wiki landing + add wiki draft pages

[devlux76]

This PR trims the repo's into a lightweight design landing / TOC page and adds a set of drafted wiki pages under .\n\n### Key changes\n- becomes a stable TOC/landing page pointing at the GitHub Wiki.\n- Added a draft wiki structure (Home + architecture/retrieval/ingestion/etc.) in .\n- Updated docs and templates to point at the wiki as the canonical design source.\n\n### Notes\n- The wiki repo itself could not be cloned from this environment (still localized to ). Once the wiki repo is accessible, these pages can be copied into it.\n- This PR is on branch .\n

[Copilot]

Pull request overview

Converts DESIGN.md from a long-form design spec into a stable landing/TOC that points to the GitHub Wiki, and adds a set of draft wiki pages under docs/wiki-draft/ to serve as the initial wiki structure.

Changes:

• Replaces DESIGN.md content with a short wiki-index landing page.
• Adds draft wiki pages covering architecture, retrieval, ingestion, consolidation, storage, security, performance, terminology, and math.
• Updates contributor/docs entry points (README, development docs, Copilot instructions, issue template link) to treat the wiki as canonical.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
docs/wiki-draft/Terminology.md	Adds terminology + numerics page; includes references to policy/model-derived constants.
docs/wiki-draft/Storage.md	Adds storage overview (OPFS vectors + IndexedDB metadata).
docs/wiki-draft/Security.md	Adds security/trust overview and sharing guardrails references.
docs/wiki-draft/Retrieval.md	Adds retrieval + Metroid overview and knowledge-gap description.
docs/wiki-draft/Performance.md	Adds Williams-bound performance/budgeting overview.
docs/wiki-draft/Math-Appendix.md	Adds math appendix (curse of dimensionality + sublinear bound).
docs/wiki-draft/Ingestion.md	Adds ingestion pipeline overview (chunk/embed/neighbor insert/hierarchy).
docs/wiki-draft/Home.md	Adds wiki home/TOC page for the draft wiki set.
docs/wiki-draft/Consolidation.md	Adds Daydreamer consolidation overview.
docs/wiki-draft/Architecture.md	Adds high-level architecture overview and core concept definitions.
docs/development.md	Updates doc-maintenance workflow to include wiki updates as canonical.
README.md	Updates documentation table to link to the wiki as canonical design documentation.
DESIGN.md	Replaces full spec with a short landing/TOC into wiki pages.
.github/copilot-instructions.md	Updates documentation guidance to keep wiki + DESIGN.md in sync.
.github/ISSUE_TEMPLATE/config.yml	Updates “Architecture Reference” link to the wiki.