Configure nextest slow-timeout profiles for unit vs e2e tests

Tighten default profile to 2s slow / 4s kill for fast feedback on
hanging unit tests, and add an `e2e` profile with 10s slow / 30s kill
for ignored tests that hit real APIs. Switch CLAUDE.md/AGENTS.md and
CI to use `cargo nextest run`. Fix retry_emits_stage_started_per_attempt
test that exceeded the new timeout by using aggressive backoff preset
instead of the 5s default.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.config/nextest.toml

@@ -1,3 +1,7 @@
 [profile.default]
-# Hard kill after 120s per test
-slow-timeout = { period = "60s", terminate-after = 2 }
+# Unit tests: flag SLOW after 2s, hard-kill after 4s
+slow-timeout = { period = "2s", terminate-after = 2 }
+
+[profile.e2e]
+# E2E (ignored) tests: flag SLOW after 10s, hard-kill after 30s
+slow-timeout = { period = "10s", terminate-after = 3 }

.github/workflows/rust.yml

@@ -66,7 +66,8 @@ jobs:
       - uses: Swatinem/rust-cache@779680da715d629ac1d338a641029a2f4372abb5 # v2
         with:
           cache-on-failure: true
-      - run: cargo test --workspace
+      - uses: taiki-e/install-action@nextest
+      - run: cargo nextest run --workspace
 
   test-macos:
     name: Test (macOS)
@@ -80,4 +81,5 @@ jobs:
       - uses: Swatinem/rust-cache@779680da715d629ac1d338a641029a2f4372abb5 # v2
         with:
           cache-on-failure: true
-      - run: cargo test --workspace
+      - uses: taiki-e/install-action@nextest
+      - run: cargo nextest run --workspace

AGENTS.md

@@ -6,11 +6,11 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ### Rust
 - `cargo build --workspace` — build all crates
-- `cargo test --workspace` — run all tests
-- `cargo test -p fabro-api` — test a single crate
-- `cargo test -p fabro-workflows -- test_name` — run a single test
-- `set -a && source .env && set +a && cargo test --workspace -- --ignored` — run all E2E live tests (requires credentials in `.env`, see `.env.example`)
-- `set -a && source .env && set +a && cargo test -p fabro-llm -- --ignored` — run E2E tests for a single crate
+- `cargo nextest run --workspace` — run all unit tests
+- `cargo nextest run -p fabro-api` — test a single crate
+- `cargo nextest run -p fabro-workflows -- test_name` — run a single test
+- `set -a && source .env && set +a && cargo nextest run --workspace --profile e2e --run-ignored only` — run all E2E live tests (requires credentials in `.env`, see `.env.example`)
+- `set -a && source .env && set +a && cargo nextest run -p fabro-llm --profile e2e --run-ignored only` — run E2E tests for a single crate
 - `cargo fmt --check --all` — check formatting
 - `cargo clippy --workspace -- -D warnings` — lint
 
@@ -42,7 +42,7 @@ The OpenAPI spec at `docs/api-reference/fabro-api.yaml` is the source of truth f
 1. Edit `docs/api-reference/fabro-api.yaml`
 2. `cargo build -p fabro-types` — build.rs regenerates Rust types via typify
 3. Write/update handler in `lib/crates/fabro-api/src/server.rs`, add route to `build_router()`
-4. `cargo test -p fabro-api` — conformance test catches spec/router drift
+4. `cargo nextest run -p fabro-api` — conformance test catches spec/router drift
 5. `cd lib/packages/fabro-api-client && bun run generate` — regenerates TypeScript Axios client
 
 ## Architecture

lib/crates/fabro-workflows/src/engine.rs

@@ -5740,9 +5740,13 @@ mod tests {
             "type".to_string(),
             AttrValue::String("fail_once".to_string()),
         );
-        // Allow 1 retry → 2 attempts total
+        // Allow 1 retry → 2 attempts total, use aggressive backoff (500ms) for fast tests
         work.attrs
             .insert("max_retries".to_string(), AttrValue::Integer(1));
+        work.attrs.insert(
+            "retry_policy".to_string(),
+            AttrValue::String("aggressive".to_string()),
+        );
         g.nodes.insert("work".to_string(), work);
 
         let mut exit = Node::new("exit");