chore: target releases at the private kellnr registry

Mirrors the textus setup, adapted for a single crate rather than a workspace.

Cargo.toml gains publish = ["kellnr"], which does double duty: it points
cargo-release at the private registry and makes an accidental `cargo publish`
to crates.io a hard error rather than an irreversible mistake.

.cargo/config.toml is committed rather than left to a per-user
~/.cargo/config.toml. Without it a fresh clone, a new machine, or CI fails
with "registry index was not found in any configuration: kellnr" before
compiling anything. The index URL is not a secret; the token stays in
~/.cargo/credentials.toml, or CARGO_REGISTRIES_KELLNR_TOKEN in CI.

release.toml flips publish from false to true and pins push = false, so the
Justfile recipe pushes last — after tags and publish have both succeeded.
The git-cliff pre-release hook is unchanged.

cliff.toml gained a Breaking Changes group. Its commit_parsers matched on type
alone with conventional_commits = false, so `refactor!: remove the inert online
flag` rendered as an ordinary Refactor bullet and the break was invisible in
the generated changelog. The new parsers match a `!` subject and a
BREAKING CHANGE body, and must precede the type parsers because the first match
wins. The unreleased section now opens with the break, which matters because
the next release is the one that removes HistoryBuilder::online.

The release recipe runs `just ci` before cutting: cargo-release only
verify-compiles the packaged crate and publishing cannot be undone, and the
release profile is where this crate's defects have historically hidden.

Still unpublishable: Cargo.toml has no `license`. That is a deliberate TODO,
not an oversight.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T5SYDExxL4vZgvunrcNSMc

.cargo/config.toml

@@ -0,0 +1,15 @@
+# `Cargo.toml` sets `publish = ["kellnr"]`, so `cargo publish` targets the
+# private registry and refuses crates.io. Cargo needs that registry's index
+# declared to resolve the name.
+#
+# Committed rather than left to a per-user `~/.cargo/config.toml` so the repo
+# is self-contained: a fresh clone, a new machine, or CI would otherwise fail
+# with
+#
+#   error: registry index was not found in any configuration: `kellnr`
+#
+# Index URL only — it is not a secret. Publish tokens live in
+# `~/.cargo/credentials.toml` (per-user, never committed) or, in CI, in
+# `CARGO_REGISTRIES_KELLNR_TOKEN`.
+[registries.kellnr]
+index = "sparse+https://crates.aceofba.se/api/v1/crates/"

Cargo.toml

@@ -5,6 +5,11 @@ edition = "2024"
 rust-version = "1.85"
 description = "TrueSkill Through Time: Bayesian skill rating that tracks how skill evolves over time, via Gaussian message passing"
 repository = "https://git.aceofba.se/logaritmisk/trueskill-tt"
+authors = ["Anders Olsson"]
+# Publishing is restricted to the private kellnr registry; this also makes
+# an accidental `cargo publish` to crates.io a hard error rather than a
+# irreversible mistake. Index is declared in `.cargo/config.toml`.
+publish = ["kellnr"]
 readme = "README.md"
 keywords = ["trueskill", "rating", "bayesian", "elo", "skill"]
 categories = ["algorithms", "science", "game-development"]

Justfile

@@ -43,3 +43,49 @@ bench:
 
 flame:
     cargo flamegraph --root --example atp
+
+# ---------------------------------------------------------------------------
+# Release workflow
+#
+# Publishing goes to the private kellnr registry only: `Cargo.toml` sets
+# `publish = ["kellnr"]`, so an accidental `cargo publish` to crates.io is a
+# hard error rather than an irreversible mistake. The index is declared in the
+# committed `.cargo/config.toml`; the token is per-user and lives in
+# `~/.cargo/credentials.toml` (`cargo login --registry kellnr`).
+#
+#   Step 1:  just release-plan [level]   — dry run, no writes
+#   Step 2:  just release [level]        — bump, changelog, tag, publish, push
+#
+# LEVEL is the cargo-release bump level (default `minor`). On 0.x:
+#   minor -> breaking bump  (0.1.2 -> 0.2.0)   <- any public-API change
+#   patch -> additive only  (0.1.2 -> 0.1.3)
+#   major -> reserved for the 1.0.0 jump
+#
+# `release.toml` regenerates CHANGELOG.md with git-cliff in a pre-release hook
+# and keeps push = false; this recipe pushes last, after publish has succeeded.
+# ---------------------------------------------------------------------------
+
+# Dry-run preview of the next release. Inspect the version bump and the
+# "Publishing ..." line before running `just release`.
+release-plan level="minor":
+    cargo release {{level}}
+
+# Cut a release from a clean main: gate -> bump -> tag -> publish -> push.
+release level="minor":
+    #!/usr/bin/env bash
+    set -euo pipefail
+
+    if [[ "$(git branch --show-current)" != "main" ]]; then
+        echo "error: run 'just release' from the 'main' branch" >&2; exit 1
+    fi
+    if [[ -n "$(git status --porcelain)" ]]; then
+        echo "error: working tree is dirty — commit or stash first" >&2; exit 1
+    fi
+
+    # cargo-release only verify-compiles the packaged crate; it does not run the
+    # suite, and publishing is irreversible. Run the same gate CI does, which
+    # includes the release profile where debug_assert! is compiled out.
+    just ci
+
+    cargo release {{level}} --execute --no-confirm
+    git push --follow-tags

cliff.toml

@@ -44,6 +44,11 @@ split_commits = false
 # Assigns commits to groups.
 # Optionally sets the commit's scope and can decide to exclude commits from further processing.
 commit_parsers = [
+    # Must precede the type parsers below: a `feat!`/`fix!`/`refactor!` subject
+    # matches those too, and the first match wins. Without this a breaking
+    # change renders as an ordinary line of its own type.
+    { message = "^[a-z]+(\\(.+\\))?!:", group = "Breaking Changes" },
+    { body = "BREAKING CHANGE", group = "Breaking Changes" },
     { message = "^feat", group = "Features" },
     { message = "^fix", group = "Bug Fixes" },
     { message = "^doc", group = "Documentation" },

release.toml

@@ -1,2 +1,6 @@
-publish = false
+# Publish to the registry named in Cargo.toml's `publish` list (kellnr).
+publish = true
+# Hold off pushing until tags and publish have both succeeded; `just release`
+# pushes last.
+push = false
 pre-release-hook = ["sh", "-c", "git cliff -o CHANGELOG.md --tag {{version}} && git add CHANGELOG.md"]