docs: define MAP architecture and MVP contracts

[rajanbor]

Outcome

Defines MAP as a framework-neutral, deterministic AI architecture layer before implementation changes.

Includes

• product vision, mission, principles, scope, glossary, MVP, roadmap, and implementation plan
• system, pattern model, graph, scanner, recommendation, verification, CLI, MCP, and security architecture
• initial Pattern, project manifest, scan, recommendation, and verification result specifications
• five accepted ADRs covering the deterministic core, stable pattern IDs/schema, JSON output, static analysis, and MCP boundary
• regenerated agent instruction projections from .map/

Compatibility decisions

• .map/ remains canonical
• category/slug IDs remain canonical for v1
• current CLI names remain supported; clearer names are additive aliases
• MCP and LLM assistance stay outside the MVP core

Verification

• map sync
• map optimize --check (3,888 / 12,000 estimated tokens)

Part of #103. Implementation follows in subsequent PRs.