docs/DESIGN.md holds the first five minutes: the five steps, their time budgets, and the words a stranger is never shown #11171

For: #11158 asks that later work be judged against one written journey. This is that page, with nothing else.

Done when:

• [x] docs/DESIGN.md has a short section, The first five minutes:

- the five steps of #11158 (link → name → username and password → say what to build → see the crew working); - the budgets (at most three screens before the forge, forge ready under 20 s, first crew activity under 60 s, the change live within five minutes); - the closed list of words a stranger is never shown on that path (subscription, autonomy, cell, child, claim).

• [x] The list of words lives once, as data in a small module under src/ that a test can import, and the doc names that module.

Files: docs/DESIGN.md, one small src/ module. Risk: keep it to one short section; the journey test is separate work.

Parked by the crew: the check stayed red through 2 automatic tries (pull #11179 closed; its branch mason/11171-docs-design-md-holds-the-first-five-minu at caea733fbe94 keeps the work so far). Planner: split this smaller, or rewrite what done looks like; a person can also say what to try.

try 1: docs/DESIGN.md, src/design/first_five_minutes.ts try 2: scripts/unreached-allow.json, test/first-five-minutes.test.ts

Reviewed pull #11191 at its head: ticked docs/DESIGN.md has a short section, The first five minutes:; The list of words lives once, as data in a small module under src/ that a test can import, and the doc names that module..