refactor(packages): merge timeout/ into guard/, rename cordis/ to self-modification/

git mv timeout-policy beside repeat-tool-guard (both are loop-hygiene
policies on the tool-execution pipeline, and the timeout/ group name
collided with util/timeout) and tool-cordis into self-modification/
(naming the role the framework name obscured). Merged/renamed group
README triplets, tsconfig globs, generator sources, hierarchy tables,
catalogs, and the timeout-policy design note's group references
follow. Adds the fifth FIXME marker (dsh-timeout-guard, recorded as a
suggestion to settle at resolution time).

guard + self-modification suites: 197 passed.

packages/self-modification/repository-plugin/src/bin.ts

@@ -0,0 +1,12 @@
+#!/usr/bin/env node
+
+/** Command-line entry that prepares the current `.dsh-plugin` package. @module */
+
+import { prepareDshPlugin } from './format.ts'
+
+try {
+  await prepareDshPlugin()
+} catch (error) {
+  process.stderr.write(`dsh-plugin-prepare: ${error instanceof Error ? error.message : String(error)}\n`)
+  process.exitCode = 1
+}