docs: reflect Fase 6 slice 1 (local MCP server) + v0.2.0 status

[rinaldofesta]

Aligns the docs with what's now on main: the released v0.2.0 (Fase 5) and the just-merged Fase 6 slice 1 — local MCP server (#33).

README

• Features: new Local MCP server row.
• Status + roadmap: Fase 5 ✅ Done (v0.2.0), Fase 6 🚧 Active (slice 1 shipped); status badge → v0.2.0 + MCP.
• "How it works" diagram + project structure: McpServerModule, lib/mcp/, app/mcp, mcp_clients.

docs/ARCHITECTURE.md

• §3.5 — MCP Server component (native dumb-transport + auth gate vs TS engine).
• ADR-017 — MCP server: LAN bind, read-only tools, TS-owned tokens, data-not-answers, minimal Streamable HTTP.
• §8.1 Threat Model — LAN attack surface, mitigations, and honest limits (no TLS, background-throttling) for slice 1.

docs/SPEC.md

• §2.3 — mcp_clients table (migration v3).
• §3.2 — note on the three returnsData tools exposed over MCP.
• §5.4 — McpServerModule (Kotlin) native contract.

docs/PRD.md

• §5.6 — MCP user stories (US-50…US-53).
• Roadmap: Fase 5 → Done, Fase 6 → in progress with slice 1 shipped.

Docs-only; verified against the merged code. Code fences balanced, no section renumbering.

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