diff --git a/checkpoint.json b/checkpoint.json
index 8c8c0ba5e..94efcf3c3 100644
--- a/checkpoint.json
+++ b/checkpoint.json
@@ -1,17 +1,20 @@
 {
-  "timestamp": "2026-03-16T03:47:28.663073Z",
-  "current_node": "toolchain",
+  "timestamp": "2026-03-16T03:48:39.331812Z",
+  "current_node": "preflight_compile",
   "completed_nodes": [
     "start",
-    "toolchain"
+    "toolchain",
+    "preflight_compile"
   ],
   "node_retries": {
     "start": 1,
-    "toolchain": 1
+    "toolchain": 1,
+    "preflight_compile": 1
   },
   "context_values": {
     "internal.fidelity": "compact",
     "failure_signature": "",
+    "internal.retry_count.preflight_compile": 1,
     "failure_class": "",
     "graph.rankdir": "LR",
     "command.stderr": "",
@@ -19,14 +22,15 @@
     "internal.retry_count.toolchain": 1,
     "thread.start.current_node": "toolchain",
     "graph.goal": "# Refactor: Collapse `pull_request_*` fields on `RunConfig` into `Option<PullRequestConfig>`\n\n## Context\n\n`RunConfig` has 4 flat `pull_request_*` fields that encode a natural tree structure. This refactor collapses them into a single `Option<PullRequestConfig>` field, reusing the existing TOML config struct directly.\n\n## Approach\n\nReplace on `RunConfig`:\n```rust\npub pull_request_enabled: bool,\npub pull_request_draft: bool,\npub pull_request_auto_merge: bool,\npub pull_request_merge_strategy: MergeStrategy,\n```\n\nWith:\n```rust\npub pull_request: Option<PullRequestConfig>,\n```\n\n- `None` = disabled (replaces `enabled: false`)\n- `Some(config)` = enabled, read `.draft`, `.auto_merge`, `.merge_strategy` directly\n- The `enabled` field on `PullRequestConfig` is still needed for TOML deserialization but is redundant at runtime\n\nDelete `AutoMergeConfig` from `pull_request.rs` — pass `Option<MergeStrategy>` directly instead (derived from `auto_merge` + `merge_strategy` on `PullRequestConfig`).\n\n## Files to modify\n\n1. **`engine.rs`** — replace 4 fields with `pull_request: Option<PullRequestConfig>`, update all test constructors (4 lines → 1: `pull_request: None`)\n2. **`run.rs`** — simplify construction: `pull_request: pr_cfg.filter(|p| p.enabled).cloned()` with draft override for auto_merge. Simplify read site: `if let Some(ref pr) = config.pull_request { ... }`\n3. **`pull_request.rs`** — change `maybe_open_pull_request` to take `&PullRequestConfig` instead of `draft: bool` + `auto_merge: Option<AutoMergeConfig>`. Delete `AutoMergeConfig`\n4. **`pr.rs`** — update call to `maybe_open_pull_request`\n5. **`server.rs`, `manager_loop.rs`** — `pull_request: None`\n6. **`tests/integration.rs`, `tests/daytona_integration.rs`** — `pull_request: None`\n\n## Verification\n\n- `cargo build --workspace`\n- `cargo clippy --workspace -- -D warnings`\n- `cargo test -p fabro-workflows -- pull_request run_config project_config`\n- `cargo fmt --check --all`\n",
-    "current.preamble": "Goal: # Refactor: Collapse `pull_request_*` fields on `RunConfig` into `Option<PullRequestConfig>`\n\n## Context\n\n`RunConfig` has 4 flat `pull_request_*` fields that encode a natural tree structure. This refactor collapses them into a single `Option<PullRequestConfig>` field, reusing the existing TOML config struct directly.\n\n## Approach\n\nReplace on `RunConfig`:\n```rust\npub pull_request_enabled: bool,\npub pull_request_draft: bool,\npub pull_request_auto_merge: bool,\npub pull_request_merge_strategy: MergeStrategy,\n```\n\nWith:\n```rust\npub pull_request: Option<PullRequestConfig>,\n```\n\n- `None` = disabled (replaces `enabled: false`)\n- `Some(config)` = enabled, read `.draft`, `.auto_merge`, `.merge_strategy` directly\n- The `enabled` field on `PullRequestConfig` is still needed for TOML deserialization but is redundant at runtime\n\nDelete `AutoMergeConfig` from `pull_request.rs` — pass `Option<MergeStrategy>` directly instead (derived from `auto_merge` + `merge_strategy` on `PullRequestConfig`).\n\n## Files to modify\n\n1. **`engine.rs`** — replace 4 fields with `pull_request: Option<PullRequestConfig>`, update all test constructors (4 lines → 1: `pull_request: None`)\n2. **`run.rs`** — simplify construction: `pull_request: pr_cfg.filter(|p| p.enabled).cloned()` with draft override for auto_merge. Simplify read site: `if let Some(ref pr) = config.pull_request { ... }`\n3. **`pull_request.rs`** — change `maybe_open_pull_request` to take `&PullRequestConfig` instead of `draft: bool` + `auto_merge: Option<AutoMergeConfig>`. Delete `AutoMergeConfig`\n4. **`pr.rs`** — update call to `maybe_open_pull_request`\n5. **`server.rs`, `manager_loop.rs`** — `pull_request: None`\n6. **`tests/integration.rs`, `tests/daytona_integration.rs`** — `pull_request: None`\n\n## Verification\n\n- `cargo build --workspace`\n- `cargo clippy --workspace -- -D warnings`\n- `cargo test -p fabro-workflows -- pull_request run_config project_config`\n- `cargo fmt --check --all`\n\n",
+    "current.preamble": "Goal: # Refactor: Collapse `pull_request_*` fields on `RunConfig` into `Option<PullRequestConfig>`\n\n## Context\n\n`RunConfig` has 4 flat `pull_request_*` fields that encode a natural tree structure. This refactor collapses them into a single `Option<PullRequestConfig>` field, reusing the existing TOML config struct directly.\n\n## Approach\n\nReplace on `RunConfig`:\n```rust\npub pull_request_enabled: bool,\npub pull_request_draft: bool,\npub pull_request_auto_merge: bool,\npub pull_request_merge_strategy: MergeStrategy,\n```\n\nWith:\n```rust\npub pull_request: Option<PullRequestConfig>,\n```\n\n- `None` = disabled (replaces `enabled: false`)\n- `Some(config)` = enabled, read `.draft`, `.auto_merge`, `.merge_strategy` directly\n- The `enabled` field on `PullRequestConfig` is still needed for TOML deserialization but is redundant at runtime\n\nDelete `AutoMergeConfig` from `pull_request.rs` — pass `Option<MergeStrategy>` directly instead (derived from `auto_merge` + `merge_strategy` on `PullRequestConfig`).\n\n## Files to modify\n\n1. **`engine.rs`** — replace 4 fields with `pull_request: Option<PullRequestConfig>`, update all test constructors (4 lines → 1: `pull_request: None`)\n2. **`run.rs`** — simplify construction: `pull_request: pr_cfg.filter(|p| p.enabled).cloned()` with draft override for auto_merge. Simplify read site: `if let Some(ref pr) = config.pull_request { ... }`\n3. **`pull_request.rs`** — change `maybe_open_pull_request` to take `&PullRequestConfig` instead of `draft: bool` + `auto_merge: Option<AutoMergeConfig>`. Delete `AutoMergeConfig`\n4. **`pr.rs`** — update call to `maybe_open_pull_request`\n5. **`server.rs`, `manager_loop.rs`** — `pull_request: None`\n6. **`tests/integration.rs`, `tests/daytona_integration.rs`** — `pull_request: None`\n\n## Verification\n\n- `cargo build --workspace`\n- `cargo clippy --workspace -- -D warnings`\n- `cargo test -p fabro-workflows -- pull_request run_config project_config`\n- `cargo fmt --check --all`\n\n\n## Completed stages\n- **toolchain**: success\n  - Script: `command -v cargo >/dev/null || { curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y && sudo ln -sf $HOME/.cargo/bin/* /usr/local/bin/; }; cargo --version 2>&1`\n  - Stdout:\n    ```\n    cargo 1.94.0 (85eff7c80 2026-01-15)\n    ```\n  - Stderr: (empty)\n",
     "internal.run_id": "01KKTC2TWVRW6ZCYYZYGRX0GD6",
     "graph.model_stylesheet": "\n            * { backend: api; model: claude-opus-4-6;}\n        ",
     "internal.node_visit_count": 1,
-    "internal.thread_id": "start",
+    "internal.thread_id": "toolchain",
     "internal.retry_count.start": 1,
-    "command.output": "cargo 1.94.0 (85eff7c80 2026-01-15)\n",
-    "current_node": "toolchain"
+    "command.output": "",
+    "thread.toolchain.current_node": "preflight_compile",
+    "current_node": "preflight_compile"
   },
   "logs": [],
   "node_outcomes": {
@@ -42,10 +46,20 @@
     "start": {
       "status": "success",
       "duration_ms": 0
+    },
+    "preflight_compile": {
+      "status": "success",
+      "context_updates": {
+        "command.stderr": "",
+        "command.output": ""
+      },
+      "notes": "Script completed: cargo check -q --workspace 2>&1",
+      "duration_ms": 68455
     }
   },
-  "next_node_id": "preflight_compile",
+  "next_node_id": "preflight_lint",
   "node_visits": {
+    "preflight_compile": 1,
     "start": 1,
     "toolchain": 1
   }
diff --git a/nodes/preflight_compile/script_invocation.json b/nodes/preflight_compile/script_invocation.json
new file mode 100644
index 000000000..ccbef36c7
--- /dev/null
+++ b/nodes/preflight_compile/script_invocation.json
@@ -0,0 +1,5 @@
+{
+  "command": "cargo check -q --workspace 2>&1",
+  "language": "shell",
+  "timeout_ms": null
+}
\ No newline at end of file
diff --git a/nodes/preflight_compile/script_timing.json b/nodes/preflight_compile/script_timing.json
new file mode 100644
index 000000000..a28bc417f
--- /dev/null
+++ b/nodes/preflight_compile/script_timing.json
@@ -0,0 +1,5 @@
+{
+  "duration_ms": 68454,
+  "exit_code": 0,
+  "timed_out": false
+}
\ No newline at end of file
diff --git a/nodes/preflight_compile/status.json b/nodes/preflight_compile/status.json
new file mode 100644
index 000000000..4016082de
--- /dev/null
+++ b/nodes/preflight_compile/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "success",
+  "notes": "Script completed: cargo check -q --workspace 2>&1",
+  "failure_reason": null,
+  "timestamp": "2026-03-16T03:48:39.331571+00:00"
+}
\ No newline at end of file