docs(installer): lead with the installer now that it is released

v0.1.0 shipped on 2026-08-07, so every doc that said "not released yet"
was wrong the moment the cutover merged.

- INSTALL.md: replace the pre-release status banner. The installer is the
  path the guide leads with; Appendix A is reframed as supported-not-
  deprecated, for hosts that cannot run the binary, operators who want to
  place files themselves, and development from a working tree.
- PLAN.md: status is Shipped, both cutover gates recorded as met (incl.
  the Windows 1053 handshake bug the real SCM run found), Phase 5 table
  and 5.4 closed out.
- README.md: point anyone setting up a shard at INSTALL.md first.
- link/link-README.md: mark the pre-split snapshot as historical, so its
  deploy.ps1 instructions stop reading as the setup path.

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

installer/INSTALL.md

@@ -3,25 +3,15 @@
 Operator guide for the **Runic Gateway installer** — the tool that takes a working ServUO
 installation and connects it to a Runic Gateway website.
 
-> **Status: the installer binary is not released yet.**
+> **The installer is the supported way to set this up.** Download one binary, run `install`, paste
+> four values into your website. It deploys the plugin overlay, installs the uo-link sidecar and
+> registers it as a service, and gives you [`doctor`, `update` and `uninstall`](#7-day-two)
+> afterwards. Start at [§1](#1-download-and-verify).
 >
-> Phases 1 to 3 are built and live on the installer repo's `edge` branch: the installer core
-> (bundle resolution, ServUO detection, the overlay sync, `install.json`), the sidecar half (the
-> binary, its config, its service, and the token handoff), and the
-> [patch tier](#4-the-patch-tier-optional). `install` is therefore complete; what is still missing
-> is [`doctor`, `update` and `uninstall`](#7-day-two), each of which reports which phase it arrives
-> in rather than failing as though you had mistyped it. The first release is being cut from that
-> branch now.
->
-> Everything it installs *is* released and published — the sidecar, the plugin overlay, and the
-> [bundle manifest](https://gitea.whitlocktech.com/RunicGateway/installer/src/branch/main/bundles/current.json)
-> that names the checked combination of the two. This guide is the operator-facing contract those
-> phases build to, and it is written first on purpose: it is the specification of what the run
-> looks like, what it asks, where it writes, and what it prints.
->
-> **You can install today without it** — [Appendix A](#appendix-a--installing-by-hand) is the same
-> deployment done by hand, with the commands verified against the current releases. When the binary
-> ships, Appendix A stays as the reference for what it does under the hood.
+> [Appendix A](#appendix-a--installing-by-hand) is the same deployment done by hand. It is
+> **supported, not deprecated** — use it on a host that cannot run the binary, when you want to
+> place things yourself, or when you are developing on the bridge and installing from a working
+> tree rather than a release. It is also the reference for what the installer does under the hood.
 >
 > Design of record: [PLAN.md](PLAN.md).
 
@@ -642,8 +632,13 @@ release tarball is gone, and the report tells you to diff against them.
 
 ## Appendix A — installing by hand
 
-This is what the installer automates. It works today, on the current releases, and is the fallback
-whenever you would rather not run an unsigned binary.
+This is what the installer automates, done by hand. It is a **supported path**, not a deprecated
+one — reach for it when the host cannot run the binary, when you would rather not run an unsigned
+one, when you want to place every file yourself, or when you are developing on the bridge and
+installing from a working tree instead of a release. It is also the reference for what
+[§2](#2-run-it) does under the hood.
+
+For a normal shard, [the installer](#1-download-and-verify) is fewer steps and checks more.
 
 Throughout: `<servuo>` is your ServUO root, and **the shard is stopped**.