CI builds tests and lints with a ci profile instead of --release

Light optimisation (deps at 2), line tables only, no LTO, debug assertions off (truck's debug-only
checks reject valid geometry, the only reason tests used --release). Cold full `cargo xtask ci`: 14 min
with all 647 tests passing; the oracle, step-corpus and app builds stay on --release.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT

.github/workflows/ci.yml

@@ -90,7 +90,7 @@ jobs:
       - uses: Swatinem/rust-cache@v2
         with:
           key: native-clippy
-      - run: cargo clippy --workspace --all-targets --release --locked -- -D warnings
+      - run: cargo clippy --workspace --all-targets --profile ci --locked -- -D warnings
 
   tests:
     name: Native Linux tests
@@ -105,9 +105,9 @@ jobs:
         with:
           key: native-tests
       - name: Compile tests
-        run: cargo test --workspace --release --locked --no-run
+        run: cargo test --workspace --profile ci --locked --no-run
       - name: Run tests
-        run: cargo test --workspace --release --locked
+        run: cargo test --workspace --profile ci --locked
 
   # Preserve the existing check name for branch protection, including docs-only PRs.
   ci:

CONTRIBUTING.md

@@ -18,7 +18,7 @@ build you also need `rustup target add wasm32-unknown-unknown` and [`trunk`](htt
 ```sh
 git clone https://github.com/bherbruck/solvecraft && cd solvecraft
 cargo run --release -p solvecraft -- --sample      # desktop app with a sample part
-cargo test --workspace --release                   # unit, engine and UI-scenario tests
+cargo test --workspace --profile ci               # unit, engine and UI-scenario tests
 cargo xtask ci                                     # everything a PR must pass (see below)
 ```
 
@@ -81,7 +81,7 @@ the most complete description of the house style.
 
 | What | Where | Run |
 |---|---|---|
-| Unit and engine tests | next to the code, or `*_tests.rs` files | `cargo test --workspace --release` |
+| Unit and engine tests | next to the code, or `*_tests.rs` files | `cargo test --workspace --profile ci` |
 | UI scenarios | `crates/ui-egui/tests/scenarios/*.json` | part of `cargo test` |
 | Fusion oracle | `cargo xtask oracle` | needs the local oracle data (see below) |
 
@@ -102,8 +102,10 @@ press keys, then assert on the result.
 A new `.json` file in that folder is picked up automatically. To record a bug before it's fixed,
 put `{"pending": "why"}` in the scenario, and remove it in the PR that fixes the bug.
 
-**Release mode matters.** CI runs the tests with `--release`. truck has debug-only assertions
-that can fail on valid geometry, so if a test fails only in debug, say so in the PR.
+**Use the `ci` profile.** CI runs the tests with `--profile ci`: light optimisation, line tables,
+no LTO, and debug assertions off (truck has debug-only assertions that reject valid geometry). It
+builds several times faster than `--release`. If a test fails only in a plain debug build, say so
+in the PR.
 
 **The Fusion oracle** is a set of 76 reference parts, each built in Fusion from a recipe.
 SolveCraft rebuilds the same recipe and compares volume, area and topology counts with Fusion's

Cargo.toml

@@ -72,6 +72,21 @@ opt-level = 2
 [profile.dev]
 opt-level = 1
 
+# Tests and lints (`cargo xtask ci`, GitHub CI): quick to build, quick enough to run. Light
+# optimisation, line tables only (file:line in backtraces), no LTO. Debug assertions are off because
+# truck's debug-only checks reject valid geometry (seam edges, closed edges); that was the only
+# reason the tests used to build with --release, which cost most of CI's time.
+[profile.ci]
+inherits = "dev"
+opt-level = 1
+debug = "line-tables-only"
+debug-assertions = false
+overflow-checks = true
+incremental = false
+
+[profile.ci.package."*"]
+opt-level = 2
+
 [profile.release]
 opt-level = 3
 lto = "thin"

xtask/src/main.rs

@@ -322,10 +322,10 @@ fn cmd_ci() -> Result<(), String> {
     c.args(["fmt", "--all", "--", "--check"]);
     run(c, "cargo fmt --check")?;
     let mut c = cargo();
-    c.args(["clippy", "--workspace", "--all-targets", "--release", "--", "-D", "warnings"]);
+    c.args(["clippy", "--workspace", "--all-targets", "--profile", "ci", "--", "-D", "warnings"]);
     run(c, "cargo clippy -D warnings")?;
     let mut c = cargo();
-    c.args(["test", "--workspace", "--release"]);
+    c.args(["test", "--workspace", "--profile", "ci"]);
     run(c, "cargo test")?;
     assets::run(&root())?;
     licences::run(&root(), true)?;