docs: root README + Architecture accuracy pass (ai-autopilot framework + connectors family)

[suleimansh]

Two accuracy gaps in the root docs, same "make the README/Architecture match what shipped" goal.

1. ai-autopilot was described as just its Supervisor seed.

• README.md — the ai-autopilot row expanded to the full AI-building framework (personas/presets, runner, surfaces, decisions ledger, the loop + prompt library, bootstrap, scale mode); examples line now lists all three quickstarts.
• Architecture.md — its ai-autopilot section said "parked as a design sketch / records direction, not a committed API", contradicting the doc's own header and ship-order table. Rewritten to "shipped", keeping the design rule and enumerating what got built.
• docs/packages/ai-autopilot.md — added a "framework layers" overview (it's the README's linked Guide) and corrected the deferred-scope note.

2. The connectors family was missing entirely.
@gemstack/connectors + connector-github + connector-google-drive exist and are documented (docs/packages/connectors*.md) but were never added to the README table or the layering diagram.

• README.md — added the three package rows, put connectors in the "how they fit together" diagram (on the mcp axis, not ai-*), and added a short "Connectors" subsection explaining the defineConnector / mountConnectors contract and the extensible connector-* pattern.
• Architecture.md — added a "Connectors (built on @gemstack/mcp)" section on the server-framework axis.

Note: the connectors packages are built but not yet published (v0.0.0) — their npm badges resolve once the open release PR #92 merges.

Docs only, no changeset. The VitePress site rebuilds from docs/ in CI.