docs: name the cockpit Keel and add its architecture

Move the higher-goals cockpit architecture into this repo: AntiDrift is
Keel's seed, with its focus harness becoming one mode of a general
collect -> brain -> act loop. Records the locked decisions: the product
is the harness around a swappable brain (claude/codex/Hermes); storage is
ActivityWatch; two surfaces (web UI + status bar); gated -> autonomous
effectors. Code/repo rename to keel deferred until the controller-refactor
decision.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

@@ -3,7 +3,14 @@
 A personal focus operating system: treat each work session as an explicit
 commitment (next action, success condition, timebox), and make drift visible.
 
-See `docs/superpowers/specs/` for the design.
+> **This repo is the seed of [Keel](docs/keel-architecture.md)** — a human-harness
+> that helps Felix hold course toward his higher goals. AntiDrift's focus harness
+> becomes Keel's first *mode*; the broader architecture (collectors, AW-as-memory,
+> swappable brain, web UI, gated effectors) is in `docs/keel-architecture.md`. The
+> repo/code rename is deferred until the controller-refactor decision.
+
+See `docs/superpowers/specs/` for the focus-OS design; `docs/keel-architecture.md`
+for where it's headed.
 
 ## Run