diff --git a/checkpoint.json b/checkpoint.json
new file mode 100644
index 000000000..d88f8f534
--- /dev/null
+++ b/checkpoint.json
@@ -0,0 +1,52 @@
+{
+  "timestamp": "2026-03-19T14:57:19.568112Z",
+  "current_node": "toolchain",
+  "completed_nodes": [
+    "start",
+    "toolchain"
+  ],
+  "node_retries": {
+    "toolchain": 1,
+    "start": 1
+  },
+  "context_values": {
+    "internal.run_id": "01KM39KFRC393V6PJ39G9XMXJ2",
+    "graph.model_stylesheet": "\n            * { backend: api; model: claude-opus-4-6;}\n        ",
+    "current.preamble": "Goal: # Detect GitHub App visibility mismatch during `repo init`\n\n## Context\n\nWhen `fabro repo init` detects the GitHub App is not installed for a repo, it shows a generic \"install at\" URL. But if the repo owner differs from the app owner, the app must be **public** to be installable. Users currently get no guidance about this, leading to confusion when the install link doesn't work.\n\n## Changes\n\n### 1. Add `get_authenticated_app()` to fabro-github\n\n**File:** `lib/crates/fabro-github/src/lib.rs`\n\nAdd two public structs near the existing response types (around line 40):\n\n```rust\npub struct AppOwner {\n    pub login: String,\n}\n\npub struct AppInfo {\n    pub slug: String,\n    pub owner: AppOwner,\n}\n```\n\nAdd function after `check_app_installed` (after line 525):\n\n- `pub async fn get_authenticated_app(client, jwt, base_url) -> Result<AppInfo, String>`\n- Calls `GET {base_url}/app` with Bearer JWT auth\n- Returns `AppInfo` on 200, errors on 401/other\n\n### 2. Add `is_app_public()` to fabro-github\n\n**File:** `lib/crates/fabro-github/src/lib.rs`\n\nAdd function after `get_authenticated_app`:\n\n- `pub async fn is_app_public(client, slug, base_url) -> Result<bool, String>`\n- Calls `GET {base_url}/apps/{slug}` **without** auth (public apps are visible to unauthenticated requests)\n- Returns `Ok(true)` on 200, `Ok(false)` on 404, error on other status\n\n### 3. Update `check_github_app_installation` in init.rs\n\n**File:** `lib/crates/fabro-cli/src/init.rs`\n\nIn the `Ok(false)` branch (line 250), before showing the install URL:\n\n1. Call `get_authenticated_app()` to get the app's owner\n2. Compare `app_info.owner.login` with the repo `owner` (case-insensitive)\n3. If they differ, call `is_app_public()` to check visibility\n4. If the app is private and owners differ, show a targeted warning:\n\n```\n  ! GitHub App \"{slug}\" is private but this repo belongs to a different owner ({repo_owner}).\n    The app must be made public before it can be installed outside {app_owner}.\n    Update visibility at: https://github.com/settings/apps/{slug}\n```\n\nAll new checks are best-effort — failures are silently ignored (the existing generic warning still shows).\n\n### 4. Tests\n\n**File:** `lib/crates/fabro-github/src/lib.rs` (test module)\n\nAdd tests using existing `mockito` patterns:\n\n- `get_authenticated_app_success` — 200 returns parsed `AppInfo`\n- `get_authenticated_app_auth_failure` — 401 returns error\n- `is_app_public_returns_true_on_200` — public app\n- `is_app_public_returns_false_on_404` — private app\n- `is_app_public_no_auth_header` — verify no Authorization header is sent\n\n## Verification\n\n1. `cargo test -p fabro-github` — new unit tests pass\n2. `cargo build --workspace` — compiles cleanly\n3. `cargo clippy --workspace -- -D warnings` — no warnings\n4. Manual: run `fabro repo init` in a repo owned by a different org than the app to verify the warning appears\n\n",
+    "internal.retry_count.toolchain": 1,
+    "internal.node_visit_count": 1,
+    "command.stderr": "",
+    "internal.retry_count.start": 1,
+    "graph.rankdir": "LR",
+    "graph.goal": "# Detect GitHub App visibility mismatch during `repo init`\n\n## Context\n\nWhen `fabro repo init` detects the GitHub App is not installed for a repo, it shows a generic \"install at\" URL. But if the repo owner differs from the app owner, the app must be **public** to be installable. Users currently get no guidance about this, leading to confusion when the install link doesn't work.\n\n## Changes\n\n### 1. Add `get_authenticated_app()` to fabro-github\n\n**File:** `lib/crates/fabro-github/src/lib.rs`\n\nAdd two public structs near the existing response types (around line 40):\n\n```rust\npub struct AppOwner {\n    pub login: String,\n}\n\npub struct AppInfo {\n    pub slug: String,\n    pub owner: AppOwner,\n}\n```\n\nAdd function after `check_app_installed` (after line 525):\n\n- `pub async fn get_authenticated_app(client, jwt, base_url) -> Result<AppInfo, String>`\n- Calls `GET {base_url}/app` with Bearer JWT auth\n- Returns `AppInfo` on 200, errors on 401/other\n\n### 2. Add `is_app_public()` to fabro-github\n\n**File:** `lib/crates/fabro-github/src/lib.rs`\n\nAdd function after `get_authenticated_app`:\n\n- `pub async fn is_app_public(client, slug, base_url) -> Result<bool, String>`\n- Calls `GET {base_url}/apps/{slug}` **without** auth (public apps are visible to unauthenticated requests)\n- Returns `Ok(true)` on 200, `Ok(false)` on 404, error on other status\n\n### 3. Update `check_github_app_installation` in init.rs\n\n**File:** `lib/crates/fabro-cli/src/init.rs`\n\nIn the `Ok(false)` branch (line 250), before showing the install URL:\n\n1. Call `get_authenticated_app()` to get the app's owner\n2. Compare `app_info.owner.login` with the repo `owner` (case-insensitive)\n3. If they differ, call `is_app_public()` to check visibility\n4. If the app is private and owners differ, show a targeted warning:\n\n```\n  ! GitHub App \"{slug}\" is private but this repo belongs to a different owner ({repo_owner}).\n    The app must be made public before it can be installed outside {app_owner}.\n    Update visibility at: https://github.com/settings/apps/{slug}\n```\n\nAll new checks are best-effort — failures are silently ignored (the existing generic warning still shows).\n\n### 4. Tests\n\n**File:** `lib/crates/fabro-github/src/lib.rs` (test module)\n\nAdd tests using existing `mockito` patterns:\n\n- `get_authenticated_app_success` — 200 returns parsed `AppInfo`\n- `get_authenticated_app_auth_failure` — 401 returns error\n- `is_app_public_returns_true_on_200` — public app\n- `is_app_public_returns_false_on_404` — private app\n- `is_app_public_no_auth_header` — verify no Authorization header is sent\n\n## Verification\n\n1. `cargo test -p fabro-github` — new unit tests pass\n2. `cargo build --workspace` — compiles cleanly\n3. `cargo clippy --workspace -- -D warnings` — no warnings\n4. Manual: run `fabro repo init` in a repo owned by a different org than the app to verify the warning appears\n",
+    "internal.thread_id": "start",
+    "failure_signature": "",
+    "outcome": "success",
+    "failure_class": "",
+    "thread.start.current_node": "toolchain",
+    "command.output": "cargo 1.94.0 (85eff7c80 2026-01-15)\n",
+    "internal.fidelity": "compact",
+    "current_node": "toolchain"
+  },
+  "logs": [],
+  "node_outcomes": {
+    "start": {
+      "status": "success",
+      "duration_ms": 0
+    },
+    "toolchain": {
+      "status": "success",
+      "context_updates": {
+        "command.output": "cargo 1.94.0 (85eff7c80 2026-01-15)\n",
+        "command.stderr": ""
+      },
+      "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": 144
+    }
+  },
+  "next_node_id": "preflight_compile",
+  "node_visits": {
+    "toolchain": 1,
+    "start": 1
+  }
+}
\ No newline at end of file
diff --git a/nodes/start/status.json b/nodes/start/status.json
new file mode 100644
index 000000000..5632fdd0c
--- /dev/null
+++ b/nodes/start/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "success",
+  "notes": null,
+  "failure_reason": null,
+  "timestamp": "2026-03-19T14:57:19.414182+00:00"
+}
\ No newline at end of file
diff --git a/nodes/toolchain/script_invocation.json b/nodes/toolchain/script_invocation.json
new file mode 100644
index 000000000..d68c414c4
--- /dev/null
+++ b/nodes/toolchain/script_invocation.json
@@ -0,0 +1,5 @@
+{
+  "command": "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",
+  "language": "shell",
+  "timeout_ms": null
+}
\ No newline at end of file
diff --git a/nodes/toolchain/script_timing.json b/nodes/toolchain/script_timing.json
new file mode 100644
index 000000000..ca290c371
--- /dev/null
+++ b/nodes/toolchain/script_timing.json
@@ -0,0 +1,5 @@
+{
+  "duration_ms": 143,
+  "exit_code": 0,
+  "timed_out": false
+}
\ No newline at end of file
diff --git a/nodes/toolchain/status.json b/nodes/toolchain/status.json
new file mode 100644
index 000000000..8d321f791
--- /dev/null
+++ b/nodes/toolchain/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "success",
+  "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",
+  "failure_reason": null,
+  "timestamp": "2026-03-19T14:57:19.567750+00:00"
+}
\ No newline at end of file