Cut non-essential prose from docs and comments, and require the same of every future change

README loses the competitor comparison, the personas and the repeated philosophy; the
five near-identical E2E command blocks become a table plus one command, and the file
map a clause per entry. AGENTS.md keeps every decision but drops the narrative around
them. todo.md's completed items collapse to their task line — git holds the rest.

Comments lose restatement, README duplication and history ("used to", "originally",
dated notes). AGENTS.md gains a Prose discipline section making this a standing pass on
every change rather than a one-off cleanup.

src/compose.test.ts now expects 6 documented E2E run commands, not 10, since the README
states the command once instead of per suite.

src/auth/guards.ts

@@ -1,8 +1,6 @@
-// Auth guards: in-handler authorization, the imperative counterpart to the
-// declarative route `permission` gate. The middleware already verified the session JWT and put
-// the User on ctx; these read it. `requireSession` asserts (throws GuardError, which app.ts maps
-// to a response); `can`/`check` are predicates a handler branches on. `check` is the one live
-// Keto call — the fine-grained "may I?" tier (README), reserved for relationship rules.
+// In-handler authorization, the imperative counterpart to the declarative route `permission` gate.
+// `requireSession` asserts (throws GuardError, which app.ts maps to a response); `can`/`check` are
+// predicates a handler branches on. `check` is the one live Keto call, for relationship rules.
 import type { RequestContext, User } from "../http/context.ts";
 import type { KetoClient } from "./keto-client.ts";
 import { localPath } from "../http/safe-url.ts";