diff --git a/checkpoint.json b/checkpoint.json
index 3c27f91b9..5ebe11067 100644
--- a/checkpoint.json
+++ b/checkpoint.json
@@ -1,36 +1,40 @@
 {
-  "timestamp": "2026-03-19T23:40:46.066974Z",
-  "current_node": "preflight_compile",
+  "timestamp": "2026-03-19T23:41:02.348842Z",
+  "current_node": "preflight_lint",
   "completed_nodes": [
     "start",
     "toolchain",
-    "preflight_compile"
+    "preflight_compile",
+    "preflight_lint"
   ],
   "node_retries": {
-    "toolchain": 1,
+    "start": 1,
     "preflight_compile": 1,
-    "start": 1
+    "preflight_lint": 1,
+    "toolchain": 1
   },
   "context_values": {
-    "current_node": "preflight_compile",
+    "current_node": "preflight_lint",
     "failure_class": "",
     "graph.rankdir": "LR",
     "internal.fidelity": "compact",
     "failure_signature": "",
-    "current.preamble": "Goal: # Plan: Merge fabro-linear and GitHub tracker into fabro-tracker\n\n## Context\n\nThe tracker ecosystem currently has three crates:\n- **fabro-tracker** — trait-only (57 lines): `Tracker` trait, `Issue`, `BlockerRef`\n- **fabro-linear** — standalone Linear functions that duplicate the `Issue`/`BlockerRef` types and don't implement the `Tracker` trait. Entirely unused.\n- **fabro-github** — mixed crate: GitHub App auth/PRs/branches (~70%) + `GitHubTracker` implementing `Tracker` (~30%). The `GitHubTracker` is also unused by consumers.\n\nGoal: consolidate both tracker implementations into `fabro-tracker`, keeping non-tracker GitHub code in `fabro-github`, and deleting `fabro-linear`.\n\n## Dependency Direction Change\n\n**Current:** `fabro-github → fabro-tracker` (for trait re-export)\n**After:** `fabro-tracker → fabro-github` (for auth primitives: `GitHubAppCredentials`, `sign_app_jwt`, `create_installation_access_token_for_projects`)\n\n`fabro-github` no longer depends on `fabro-tracker`. No circular dependency.\n\n## Steps\n\n### 1. Update `lib/crates/fabro-tracker/Cargo.toml`\n\nAdd dependencies needed by both implementations:\n```toml\n[dependencies]\nfabro-github = { path = \"../fabro-github\" }\nasync-trait.workspace = true\nserde.workspace = true\nserde_json.workspace = true\nreqwest.workspace = true\ntracing.workspace = true\ntokio = { workspace = true }\n\n[dev-dependencies]\nmockito = \"1\"\ntokio = { workspace = true, features = [\"test-util\", \"macros\"] }\n```\n\n### 2. Update `lib/crates/fabro-github/Cargo.toml`\n\nRemove:\n- `fabro-tracker = { path = \"../fabro-tracker\" }`\n- `async-trait.workspace = true`\n\n### 3. Remove tracker code from `lib/crates/fabro-github/src/lib.rs`\n\nRemove these items (keep everything else):\n- `use async_trait::async_trait;` (line 1)\n- `use tokio::sync::OnceCell;` (line 3)\n- `pub use fabro_tracker::{BlockerRef, Issue, Tracker};` (line 5)\n- `execute_github_graphql()` fn (~line 796)\n- `GitHubTracker` struct, `impl GitHubTracker`, `impl Tracker for GitHubTracker` (~line 866-1315)\n- `normalize_github_item()` fn (~line 981)\n- `fetch_project_items_page()` fn (~line 1035)\n- All tracker-related tests (~line 2172-2841): `execute_github_graphql` tests, tracker helpers (`mock_github_tracker`, `make_test_issue`, etc.), and all `GitHubTracker` method tests\n\n**Keep** `create_installation_access_token_for_projects()` — it stays in fabro-github as a public function alongside the other `create_installation_access_token_*` variants.\n\n### 4. Create `lib/crates/fabro-tracker/src/linear.rs`\n\nAdapt `fabro-linear/src/lib.rs` code:\n- **Remove** the duplicate `Issue` and `BlockerRef` struct definitions — use `crate::Issue` and `crate::BlockerRef`\n- **Adapt** `normalize_issue()` to return `crate::Issue` with `project_item_id: None`\n- **Create** `LinearTracker` struct wrapping `LinearConfig`, `reqwest::Client`, and `project_slug: String`\n- **Implement** `Tracker for LinearTracker` by delegating to the existing functions\n- **Keep** private: `execute_graphql`, `normalize_issue`, `extract_issues`, `ISSUE_FIELDS`, `BLOCKS_RELATION_TYPE`\n- **Keep** public: `LinearConfig`, `LinearTracker`, `LINEAR_API_ENDPOINT`\n- **Move** all tests, updating assertions for the added `project_item_id` field\n\n### 5. Create `lib/crates/fabro-tracker/src/github.rs`\n\nMove tracker code from fabro-github:\n- Import from fabro-github: `GitHubAppCredentials`, `sign_app_jwt`, `create_installation_access_token_for_projects`\n- Contains: `GitHubTracker` struct + impls, `execute_github_graphql`, `normalize_github_item`, `fetch_project_items_page`\n- Uses `crate::Issue` and `crate::BlockerRef` (same types, just different import path)\n- Move all GitHubTracker tests (duplicate `test_rsa_key()` helper since test code isn't importable across crates)\n\n### 6. Update `lib/crates/fabro-tracker/src/lib.rs`\n\nAdd module declarations and re-exports:\n```rust\npub mod github;\npub mod linear;\n\npub use github::GitHubTracker;\npub use linear::{LinearConfig, LinearTracker, LINEAR_API_ENDPOINT};\n```\n\n### 7. Delete `lib/crates/fabro-linear/`\n\nRemove entire directory. Workspace glob `members = [\"lib/crates/*\"]` handles the rest.\n\n## Verification\n\n```bash\ncargo build --workspace\ncargo test --workspace\ncargo clippy --workspace -- -D warnings\ncargo fmt --check --all\n```\n\nKey things to verify:\n- No circular dependency (fabro-tracker → fabro-github, fabro-github has no fabro-tracker dep)\n- Linear `normalize_issue` sets `project_item_id: None`\n- All moved tests pass in their new home\n- `test_rsa_key()` helper is duplicated in fabro-tracker's github test module\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",
+    "current.preamble": "Goal: # Plan: Merge fabro-linear and GitHub tracker into fabro-tracker\n\n## Context\n\nThe tracker ecosystem currently has three crates:\n- **fabro-tracker** — trait-only (57 lines): `Tracker` trait, `Issue`, `BlockerRef`\n- **fabro-linear** — standalone Linear functions that duplicate the `Issue`/`BlockerRef` types and don't implement the `Tracker` trait. Entirely unused.\n- **fabro-github** — mixed crate: GitHub App auth/PRs/branches (~70%) + `GitHubTracker` implementing `Tracker` (~30%). The `GitHubTracker` is also unused by consumers.\n\nGoal: consolidate both tracker implementations into `fabro-tracker`, keeping non-tracker GitHub code in `fabro-github`, and deleting `fabro-linear`.\n\n## Dependency Direction Change\n\n**Current:** `fabro-github → fabro-tracker` (for trait re-export)\n**After:** `fabro-tracker → fabro-github` (for auth primitives: `GitHubAppCredentials`, `sign_app_jwt`, `create_installation_access_token_for_projects`)\n\n`fabro-github` no longer depends on `fabro-tracker`. No circular dependency.\n\n## Steps\n\n### 1. Update `lib/crates/fabro-tracker/Cargo.toml`\n\nAdd dependencies needed by both implementations:\n```toml\n[dependencies]\nfabro-github = { path = \"../fabro-github\" }\nasync-trait.workspace = true\nserde.workspace = true\nserde_json.workspace = true\nreqwest.workspace = true\ntracing.workspace = true\ntokio = { workspace = true }\n\n[dev-dependencies]\nmockito = \"1\"\ntokio = { workspace = true, features = [\"test-util\", \"macros\"] }\n```\n\n### 2. Update `lib/crates/fabro-github/Cargo.toml`\n\nRemove:\n- `fabro-tracker = { path = \"../fabro-tracker\" }`\n- `async-trait.workspace = true`\n\n### 3. Remove tracker code from `lib/crates/fabro-github/src/lib.rs`\n\nRemove these items (keep everything else):\n- `use async_trait::async_trait;` (line 1)\n- `use tokio::sync::OnceCell;` (line 3)\n- `pub use fabro_tracker::{BlockerRef, Issue, Tracker};` (line 5)\n- `execute_github_graphql()` fn (~line 796)\n- `GitHubTracker` struct, `impl GitHubTracker`, `impl Tracker for GitHubTracker` (~line 866-1315)\n- `normalize_github_item()` fn (~line 981)\n- `fetch_project_items_page()` fn (~line 1035)\n- All tracker-related tests (~line 2172-2841): `execute_github_graphql` tests, tracker helpers (`mock_github_tracker`, `make_test_issue`, etc.), and all `GitHubTracker` method tests\n\n**Keep** `create_installation_access_token_for_projects()` — it stays in fabro-github as a public function alongside the other `create_installation_access_token_*` variants.\n\n### 4. Create `lib/crates/fabro-tracker/src/linear.rs`\n\nAdapt `fabro-linear/src/lib.rs` code:\n- **Remove** the duplicate `Issue` and `BlockerRef` struct definitions — use `crate::Issue` and `crate::BlockerRef`\n- **Adapt** `normalize_issue()` to return `crate::Issue` with `project_item_id: None`\n- **Create** `LinearTracker` struct wrapping `LinearConfig`, `reqwest::Client`, and `project_slug: String`\n- **Implement** `Tracker for LinearTracker` by delegating to the existing functions\n- **Keep** private: `execute_graphql`, `normalize_issue`, `extract_issues`, `ISSUE_FIELDS`, `BLOCKS_RELATION_TYPE`\n- **Keep** public: `LinearConfig`, `LinearTracker`, `LINEAR_API_ENDPOINT`\n- **Move** all tests, updating assertions for the added `project_item_id` field\n\n### 5. Create `lib/crates/fabro-tracker/src/github.rs`\n\nMove tracker code from fabro-github:\n- Import from fabro-github: `GitHubAppCredentials`, `sign_app_jwt`, `create_installation_access_token_for_projects`\n- Contains: `GitHubTracker` struct + impls, `execute_github_graphql`, `normalize_github_item`, `fetch_project_items_page`\n- Uses `crate::Issue` and `crate::BlockerRef` (same types, just different import path)\n- Move all GitHubTracker tests (duplicate `test_rsa_key()` helper since test code isn't importable across crates)\n\n### 6. Update `lib/crates/fabro-tracker/src/lib.rs`\n\nAdd module declarations and re-exports:\n```rust\npub mod github;\npub mod linear;\n\npub use github::GitHubTracker;\npub use linear::{LinearConfig, LinearTracker, LINEAR_API_ENDPOINT};\n```\n\n### 7. Delete `lib/crates/fabro-linear/`\n\nRemove entire directory. Workspace glob `members = [\"lib/crates/*\"]` handles the rest.\n\n## Verification\n\n```bash\ncargo build --workspace\ncargo test --workspace\ncargo clippy --workspace -- -D warnings\ncargo fmt --check --all\n```\n\nKey things to verify:\n- No circular dependency (fabro-tracker → fabro-github, fabro-github has no fabro-tracker dep)\n- Linear `normalize_issue` sets `project_item_id: None`\n- All moved tests pass in their new home\n- `test_rsa_key()` helper is duplicated in fabro-tracker's github test module\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- **preflight_compile**: success\n  - Script: `cargo check -q --workspace 2>&1`\n  - Stdout: (empty)\n  - Stderr: (empty)\n",
     "internal.retry_count.toolchain": 1,
     "graph.model_stylesheet": "\n            * { backend: api; model: claude-opus-4-6;}\n        ",
     "thread.toolchain.current_node": "preflight_compile",
     "outcome": "success",
     "internal.retry_count.preflight_compile": 1,
+    "internal.retry_count.preflight_lint": 1,
     "command.stderr": "",
     "graph.goal": "# Plan: Merge fabro-linear and GitHub tracker into fabro-tracker\n\n## Context\n\nThe tracker ecosystem currently has three crates:\n- **fabro-tracker** — trait-only (57 lines): `Tracker` trait, `Issue`, `BlockerRef`\n- **fabro-linear** — standalone Linear functions that duplicate the `Issue`/`BlockerRef` types and don't implement the `Tracker` trait. Entirely unused.\n- **fabro-github** — mixed crate: GitHub App auth/PRs/branches (~70%) + `GitHubTracker` implementing `Tracker` (~30%). The `GitHubTracker` is also unused by consumers.\n\nGoal: consolidate both tracker implementations into `fabro-tracker`, keeping non-tracker GitHub code in `fabro-github`, and deleting `fabro-linear`.\n\n## Dependency Direction Change\n\n**Current:** `fabro-github → fabro-tracker` (for trait re-export)\n**After:** `fabro-tracker → fabro-github` (for auth primitives: `GitHubAppCredentials`, `sign_app_jwt`, `create_installation_access_token_for_projects`)\n\n`fabro-github` no longer depends on `fabro-tracker`. No circular dependency.\n\n## Steps\n\n### 1. Update `lib/crates/fabro-tracker/Cargo.toml`\n\nAdd dependencies needed by both implementations:\n```toml\n[dependencies]\nfabro-github = { path = \"../fabro-github\" }\nasync-trait.workspace = true\nserde.workspace = true\nserde_json.workspace = true\nreqwest.workspace = true\ntracing.workspace = true\ntokio = { workspace = true }\n\n[dev-dependencies]\nmockito = \"1\"\ntokio = { workspace = true, features = [\"test-util\", \"macros\"] }\n```\n\n### 2. Update `lib/crates/fabro-github/Cargo.toml`\n\nRemove:\n- `fabro-tracker = { path = \"../fabro-tracker\" }`\n- `async-trait.workspace = true`\n\n### 3. Remove tracker code from `lib/crates/fabro-github/src/lib.rs`\n\nRemove these items (keep everything else):\n- `use async_trait::async_trait;` (line 1)\n- `use tokio::sync::OnceCell;` (line 3)\n- `pub use fabro_tracker::{BlockerRef, Issue, Tracker};` (line 5)\n- `execute_github_graphql()` fn (~line 796)\n- `GitHubTracker` struct, `impl GitHubTracker`, `impl Tracker for GitHubTracker` (~line 866-1315)\n- `normalize_github_item()` fn (~line 981)\n- `fetch_project_items_page()` fn (~line 1035)\n- All tracker-related tests (~line 2172-2841): `execute_github_graphql` tests, tracker helpers (`mock_github_tracker`, `make_test_issue`, etc.), and all `GitHubTracker` method tests\n\n**Keep** `create_installation_access_token_for_projects()` — it stays in fabro-github as a public function alongside the other `create_installation_access_token_*` variants.\n\n### 4. Create `lib/crates/fabro-tracker/src/linear.rs`\n\nAdapt `fabro-linear/src/lib.rs` code:\n- **Remove** the duplicate `Issue` and `BlockerRef` struct definitions — use `crate::Issue` and `crate::BlockerRef`\n- **Adapt** `normalize_issue()` to return `crate::Issue` with `project_item_id: None`\n- **Create** `LinearTracker` struct wrapping `LinearConfig`, `reqwest::Client`, and `project_slug: String`\n- **Implement** `Tracker for LinearTracker` by delegating to the existing functions\n- **Keep** private: `execute_graphql`, `normalize_issue`, `extract_issues`, `ISSUE_FIELDS`, `BLOCKS_RELATION_TYPE`\n- **Keep** public: `LinearConfig`, `LinearTracker`, `LINEAR_API_ENDPOINT`\n- **Move** all tests, updating assertions for the added `project_item_id` field\n\n### 5. Create `lib/crates/fabro-tracker/src/github.rs`\n\nMove tracker code from fabro-github:\n- Import from fabro-github: `GitHubAppCredentials`, `sign_app_jwt`, `create_installation_access_token_for_projects`\n- Contains: `GitHubTracker` struct + impls, `execute_github_graphql`, `normalize_github_item`, `fetch_project_items_page`\n- Uses `crate::Issue` and `crate::BlockerRef` (same types, just different import path)\n- Move all GitHubTracker tests (duplicate `test_rsa_key()` helper since test code isn't importable across crates)\n\n### 6. Update `lib/crates/fabro-tracker/src/lib.rs`\n\nAdd module declarations and re-exports:\n```rust\npub mod github;\npub mod linear;\n\npub use github::GitHubTracker;\npub use linear::{LinearConfig, LinearTracker, LINEAR_API_ENDPOINT};\n```\n\n### 7. Delete `lib/crates/fabro-linear/`\n\nRemove entire directory. Workspace glob `members = [\"lib/crates/*\"]` handles the rest.\n\n## Verification\n\n```bash\ncargo build --workspace\ncargo test --workspace\ncargo clippy --workspace -- -D warnings\ncargo fmt --check --all\n```\n\nKey things to verify:\n- No circular dependency (fabro-tracker → fabro-github, fabro-github has no fabro-tracker dep)\n- Linear `normalize_issue` sets `project_item_id: None`\n- All moved tests pass in their new home\n- `test_rsa_key()` helper is duplicated in fabro-tracker's github test module\n",
     "internal.node_visit_count": 1,
+    "thread.preflight_compile.current_node": "preflight_lint",
     "command.output": "",
     "internal.run_id": "01KM47FJJCP2B23W0MFSE9WVBX",
     "internal.retry_count.start": 1,
     "thread.start.current_node": "toolchain",
-    "internal.thread_id": "toolchain"
+    "internal.thread_id": "preflight_compile"
   },
   "logs": [],
   "node_outcomes": {
@@ -43,10 +47,6 @@
       "notes": "Script completed: cargo check -q --workspace 2>&1",
       "duration_ms": 74610
     },
-    "start": {
-      "status": "success",
-      "duration_ms": 0
-    },
     "toolchain": {
       "status": "success",
       "context_updates": {
@@ -55,12 +55,26 @@
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       "notes": "Script completed: 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",
       "duration_ms": 116
+    },
+    "preflight_lint": {
+      "status": "success",
+      "context_updates": {
+        "command.output": "",
+        "command.stderr": ""
+      },
+      "notes": "Script completed: cargo clippy -q --workspace -- -D warnings 2>&1",
+      "duration_ms": 12837
+    },
+    "start": {
+      "status": "success",
+      "duration_ms": 0
     }
   },
-  "next_node_id": "preflight_lint",
+  "next_node_id": "implement",
   "node_visits": {
-    "start": 1,
     "toolchain": 1,
+    "preflight_lint": 1,
+    "start": 1,
     "preflight_compile": 1
   }
 }
\ No newline at end of file
diff --git a/nodes/preflight_lint/script_invocation.json b/nodes/preflight_lint/script_invocation.json
new file mode 100644
index 000000000..d17d3d16d
--- /dev/null
+++ b/nodes/preflight_lint/script_invocation.json
@@ -0,0 +1,5 @@
+{
+  "command": "cargo clippy -q --workspace -- -D warnings 2>&1",
+  "language": "shell",
+  "timeout_ms": null
+}
\ No newline at end of file
diff --git a/nodes/preflight_lint/script_timing.json b/nodes/preflight_lint/script_timing.json
new file mode 100644
index 000000000..f210d78ac
--- /dev/null
+++ b/nodes/preflight_lint/script_timing.json
@@ -0,0 +1,5 @@
+{
+  "duration_ms": 12835,
+  "exit_code": 0,
+  "timed_out": false
+}
\ No newline at end of file
diff --git a/nodes/preflight_lint/status.json b/nodes/preflight_lint/status.json
new file mode 100644
index 000000000..1da293905
--- /dev/null
+++ b/nodes/preflight_lint/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "success",
+  "notes": "Script completed: cargo clippy -q --workspace -- -D warnings 2>&1",
+  "failure_reason": null,
+  "timestamp": "2026-03-19T23:41:02.348093+00:00"
+}
\ No newline at end of file