Adopt pinned public core snapshot and prepare Sized 2.0.0

MANUAL.md

@@ -16,27 +16,21 @@
 
 ## Installation
 
-### From source
+See the [README](README.md#installation) for signed Apple silicon Mac downloads,
+Linux archives, checksums and source builds. The offline source archive includes
+the exact shared core and registry dependencies, with no private forge login.
 
-The following installs the current review branch, including scanner hardening
-not present in the published v1.0.0 release:
+Rust 1.88 or newer and a C linker/toolchain are required for source builds:
 
-```bash
-git clone --branch sizequeen-scan-hardening https://gitea.speelman.ca/gamertan/sized.git
+```sh
+git clone --branch v2.0.0 https://gitea.speelman.ca/gamertan/sized.git
 cd sized
 cargo install --locked --path .
 ```
 
-Cargo installs to `~/.cargo/bin`. For the published source instead, check out
-`v1.0.0` before installing. `make install PREFIX="$HOME/.local"` additionally
-installs the man page without requiring administrator privileges.
-
-### Existing release files
-
-The [v1.0.0 release](https://gitea.speelman.ca/gamertan/sized/releases/tag/v1.0.0)
-has source archives, a macOS arm64 executable, a man page and completions.
-It has no Linux binary, architecture-labelled binary archive or `.deb` attachment.
-See the [README](README.md#installation) for current installation guidance.
+Cargo installs into `~/.cargo/bin`. To install the binary and man page together,
+use `make install PREFIX="$HOME/.local"`. See [2.0 migration notes](docs/UPGRADING-2.md)
+for changed exit statuses, accounting and public Rust APIs.
 
 ## Basic Usage