install.sh and install.ps1 install lore, star and writ, and take the base, team and personal layers without requiring them #798

Epic: #453 — release, distribution, and self-install.

Setting up the Windows test machine on 2026-09-04 took a hand-copied binary, self install, three writ repo
lines and a trip back for the clone names. The installers should make a new machine one command.

What install.sh and install.ps1 do today

Download a release archive from GitHub (GH_TOKEN, DEVLORE_VERSION, --prefix), copy writ and lore
into <prefix>/bin, and print what to run next. DEVLORE_TOOLS knows all, writ and lore; star is not
installed at all, though it is one of the four programs and now ships the base layer's extensions. Nothing
configures a layer. install.ps1 declares no PowerShell version and runs under whatever launched it.

Ruled 2026-09-04

1. Both installers install lore, star and writ, by fetching the archive and running each program's own
   self install, which is the one installer the suite has: binary, man pages, completions for the shells
   present, default config, star's extensions. The scripts fetch and delegate; they do not re-implement.
2. The three layers are accepted or prompted, never required. --base, --team, --personal (each a
   working-tree path or a repository URL, the writ repo grammar) register the layer when given. With a
   terminal and a layer not given, the installer asks once, with an empty answer meaning skip; without a
   terminal it skips silently and says what it skipped. This is §10 of the CLI design applied to the
   installer: interactive only when a TTY is present, one question at a time, unattended runs on what was
   given.
3. PowerShell: Core. The body is #Requires -Version 7, one code path, cross-platform. The one thing
   Windows PowerShell 5.1 must be able to run is a preamble that installs pwsh (winget install Microsoft.PowerShell) and re-launches the script under it, because 5.1 is what a fresh Windows machine
   has and pwsh is not. Nothing else targets 5.1.

Acceptance

• one command on a fresh macOS, Linux or Windows machine installs lore, star and writ through their self install
• --base/--team/--personal register layers; a TTY prompts once each for the ones not given, empty skips; no TTY skips and says so
• install.ps1 runs under pwsh; launched from 5.1 it installs pwsh and re-launches itself
• the release archive carries star alongside lore and writ, if it does not already
• the README's install section shows the one command and the three flags

Found setting up DANOBLE-WD11-3. Its own worktree.