diff --git a/checkpoint.json b/checkpoint.json
index d52a71532..b0c2424f1 100644
--- a/checkpoint.json
+++ b/checkpoint.json
@@ -1,29 +1,35 @@
 {
-  "timestamp": "2026-03-19T15:05:19.277221Z",
-  "current_node": "preflight_lint",
+  "timestamp": "2026-03-19T15:08:46.450812Z",
+  "current_node": "implement",
   "completed_nodes": [
     "start",
     "toolchain",
     "preflight_compile",
-    "preflight_lint"
+    "preflight_lint",
+    "implement"
   ],
   "node_retries": {
     "preflight_lint": 1,
     "toolchain": 1,
     "preflight_compile": 1,
+    "implement": 1,
     "start": 1
   },
   "context_values": {
     "internal.node_visit_count": 1,
-    "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\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",
+    "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\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- **preflight_lint**: success\n  - Script: `cargo clippy -q --workspace -- -D warnings 2>&1`\n  - Stdout: (empty)\n  - Stderr: (empty)\n",
+    "response.implement": "All 55 tests pass. Here's a summary of all changes made:\n\n### Changes Summary\n\n**1. `lib/crates/fabro-github/src/lib.rs`** — Added two structs and two functions:\n\n- **`AppOwner`** struct — holds the `login` field for the app's owner\n- **`AppInfo`** struct — holds `slug` and `owner` (an `AppOwner`), both derived from `Deserialize`\n- **`get_authenticated_app(client, jwt, base_url)`** — calls `GET {base_url}/app` with Bearer JWT auth, returns `AppInfo` on 200, error on 401/other\n- **`is_app_public(client, slug, base_url)`** — calls `GET {base_url}/apps/{slug}` **without** auth, returns `Ok(true)` on 200, `Ok(false)` on 404, error on other\n\n**5 new tests** added to the test module:\n- `get_authenticated_app_success` — verifies 200 response is parsed into `AppInfo`\n- `get_authenticated_app_auth_failure` — verifies 401 returns authentication error\n- `is_app_public_returns_true_on_200` — public app returns true\n- `is_app_public_returns_false_on_404` — private app returns false\n- `is_app_public_no_auth_header` — verifies no `Authorization` header is sent (using `Matcher::Missing`)\n\n**2. `lib/crates/fabro-cli/src/init.rs`** — Updated `check_github_app_installation`:\n\nIn the `Ok(false)` branch (app not installed), before showing the install URL, added best-effort checks:\n1. Calls `get_authenticated_app()` to get the app's owner\n2. Compares `app_info.owner.login` with the repo `owner` (case-insensitive via `eq_ignore_ascii_case`)\n3. If they differ, calls `is_app_public()` to check visibility\n4. If the app is private and owners differ, shows a targeted warning about making the app public\n\nAll checks are best-effort — failures at any step are silently ignored and the existing generic warning still shows.",
     "internal.retry_count.toolchain": 1,
+    "last_response": "All 55 tests pass. Here's a summary of all changes made:\n\n### Changes Summary\n\n**1. `lib/crates/fabro-github/src/lib.rs`** — Added two structs and two functions:\n\n- **`AppOwner`** struct — holds t",
     "failure_signature": "",
     "internal.retry_count.preflight_lint": 1,
-    "internal.thread_id": "preflight_compile",
-    "current_node": "preflight_lint",
+    "internal.retry_count.implement": 1,
+    "internal.thread_id": "preflight_lint",
+    "current_node": "implement",
     "internal.retry_count.start": 1,
     "graph.rankdir": "LR",
     "internal.run_id": "01KM39Z9DVCBB36GZMYAA6P0FJ",
+    "thread.preflight_lint.current_node": "implement",
     "outcome": "success",
     "graph.model_stylesheet": "\n            * { backend: api; model: claude-opus-4-6;}\n        ",
     "failure_class": "",
@@ -34,6 +40,7 @@
     "command.stderr": "",
     "internal.retry_count.preflight_compile": 1,
     "thread.toolchain.current_node": "preflight_compile",
+    "last_stage": "implement",
     "command.output": ""
   },
   "logs": [],
@@ -56,6 +63,29 @@
       "notes": "Script completed: cargo clippy -q --workspace -- -D warnings 2>&1",
       "duration_ms": 13770
     },
+    "implement": {
+      "status": "success",
+      "context_updates": {
+        "last_response": "All 55 tests pass. Here's a summary of all changes made:\n\n### Changes Summary\n\n**1. `lib/crates/fabro-github/src/lib.rs`** — Added two structs and two functions:\n\n- **`AppOwner`** struct — holds t",
+        "last_stage": "implement",
+        "response.implement": "All 55 tests pass. Here's a summary of all changes made:\n\n### Changes Summary\n\n**1. `lib/crates/fabro-github/src/lib.rs`** — Added two structs and two functions:\n\n- **`AppOwner`** struct — holds the `login` field for the app's owner\n- **`AppInfo`** struct — holds `slug` and `owner` (an `AppOwner`), both derived from `Deserialize`\n- **`get_authenticated_app(client, jwt, base_url)`** — calls `GET {base_url}/app` with Bearer JWT auth, returns `AppInfo` on 200, error on 401/other\n- **`is_app_public(client, slug, base_url)`** — calls `GET {base_url}/apps/{slug}` **without** auth, returns `Ok(true)` on 200, `Ok(false)` on 404, error on other\n\n**5 new tests** added to the test module:\n- `get_authenticated_app_success` — verifies 200 response is parsed into `AppInfo`\n- `get_authenticated_app_auth_failure` — verifies 401 returns authentication error\n- `is_app_public_returns_true_on_200` — public app returns true\n- `is_app_public_returns_false_on_404` — private app returns false\n- `is_app_public_no_auth_header` — verifies no `Authorization` header is sent (using `Matcher::Missing`)\n\n**2. `lib/crates/fabro-cli/src/init.rs`** — Updated `check_github_app_installation`:\n\nIn the `Ok(false)` branch (app not installed), before showing the install URL, added best-effort checks:\n1. Calls `get_authenticated_app()` to get the app's owner\n2. Compares `app_info.owner.login` with the repo `owner` (case-insensitive via `eq_ignore_ascii_case`)\n3. If they differ, calls `is_app_public()` to check visibility\n4. If the app is private and owners differ, shows a targeted warning about making the app public\n\nAll checks are best-effort — failures at any step are silently ignored and the existing generic warning still shows."
+      },
+      "notes": "Stage completed: implement",
+      "usage": {
+        "model": "claude-opus-4-6",
+        "input_tokens": 38264,
+        "output_tokens": 4938,
+        "cache_read_tokens": 401866,
+        "cache_write_tokens": 43204,
+        "reasoning_tokens": 126,
+        "cost": 0.94431
+      },
+      "files_touched": [
+        "/home/daytona/workspace/lib/crates/fabro-cli/src/init.rs",
+        "/home/daytona/workspace/lib/crates/fabro-github/src/lib.rs"
+      ],
+      "duration_ms": 203786
+    },
     "toolchain": {
       "status": "success",
       "context_updates": {
@@ -70,8 +100,9 @@
       "duration_ms": 0
     }
   },
-  "next_node_id": "implement",
+  "next_node_id": "simplify_opus",
   "node_visits": {
+    "implement": 1,
     "preflight_lint": 1,
     "preflight_compile": 1,
     "start": 1,
diff --git a/nodes/implement/prompt.md b/nodes/implement/prompt.md
new file mode 100644
index 000000000..2fc5b86b2
--- /dev/null
+++ b/nodes/implement/prompt.md
@@ -0,0 +1,99 @@
+Goal: # Detect GitHub App visibility mismatch during `repo init`
+
+## Context
+
+When `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.
+
+## Changes
+
+### 1. Add `get_authenticated_app()` to fabro-github
+
+**File:** `lib/crates/fabro-github/src/lib.rs`
+
+Add two public structs near the existing response types (around line 40):
+
+```rust
+pub struct AppOwner {
+    pub login: String,
+}
+
+pub struct AppInfo {
+    pub slug: String,
+    pub owner: AppOwner,
+}
+```
+
+Add function after `check_app_installed` (after line 525):
+
+- `pub async fn get_authenticated_app(client, jwt, base_url) -> Result<AppInfo, String>`
+- Calls `GET {base_url}/app` with Bearer JWT auth
+- Returns `AppInfo` on 200, errors on 401/other
+
+### 2. Add `is_app_public()` to fabro-github
+
+**File:** `lib/crates/fabro-github/src/lib.rs`
+
+Add function after `get_authenticated_app`:
+
+- `pub async fn is_app_public(client, slug, base_url) -> Result<bool, String>`
+- Calls `GET {base_url}/apps/{slug}` **without** auth (public apps are visible to unauthenticated requests)
+- Returns `Ok(true)` on 200, `Ok(false)` on 404, error on other status
+
+### 3. Update `check_github_app_installation` in init.rs
+
+**File:** `lib/crates/fabro-cli/src/init.rs`
+
+In the `Ok(false)` branch (line 250), before showing the install URL:
+
+1. Call `get_authenticated_app()` to get the app's owner
+2. Compare `app_info.owner.login` with the repo `owner` (case-insensitive)
+3. If they differ, call `is_app_public()` to check visibility
+4. If the app is private and owners differ, show a targeted warning:
+
+```
+  ! GitHub App "{slug}" is private but this repo belongs to a different owner ({repo_owner}).
+    The app must be made public before it can be installed outside {app_owner}.
+    Update visibility at: https://github.com/settings/apps/{slug}
+```
+
+All new checks are best-effort — failures are silently ignored (the existing generic warning still shows).
+
+### 4. Tests
+
+**File:** `lib/crates/fabro-github/src/lib.rs` (test module)
+
+Add tests using existing `mockito` patterns:
+
+- `get_authenticated_app_success` — 200 returns parsed `AppInfo`
+- `get_authenticated_app_auth_failure` — 401 returns error
+- `is_app_public_returns_true_on_200` — public app
+- `is_app_public_returns_false_on_404` — private app
+- `is_app_public_no_auth_header` — verify no Authorization header is sent
+
+## Verification
+
+1. `cargo test -p fabro-github` — new unit tests pass
+2. `cargo build --workspace` — compiles cleanly
+3. `cargo clippy --workspace -- -D warnings` — no warnings
+4. Manual: run `fabro repo init` in a repo owned by a different org than the app to verify the warning appears
+
+
+## Completed stages
+- **toolchain**: success
+  - 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`
+  - Stdout:
+    ```
+    cargo 1.94.0 (85eff7c80 2026-01-15)
+    ```
+  - Stderr: (empty)
+- **preflight_compile**: success
+  - Script: `cargo check -q --workspace 2>&1`
+  - Stdout: (empty)
+  - Stderr: (empty)
+- **preflight_lint**: success
+  - Script: `cargo clippy -q --workspace -- -D warnings 2>&1`
+  - Stdout: (empty)
+  - Stderr: (empty)
+
+
+Read the plan file referenced in the goal and implement every step. Make all the code changes described in the plan. Use red/green TDD.
\ No newline at end of file
diff --git a/nodes/implement/provider_used.json b/nodes/implement/provider_used.json
new file mode 100644
index 000000000..c1905ff10
--- /dev/null
+++ b/nodes/implement/provider_used.json
@@ -0,0 +1,5 @@
+{
+  "mode": "agent",
+  "provider": "anthropic",
+  "model": "claude-opus-4-6"
+}
\ No newline at end of file
diff --git a/nodes/implement/response.md b/nodes/implement/response.md
new file mode 100644
index 000000000..6b005045f
--- /dev/null
+++ b/nodes/implement/response.md
@@ -0,0 +1,27 @@
+All 55 tests pass. Here's a summary of all changes made:
+
+### Changes Summary
+
+**1. `lib/crates/fabro-github/src/lib.rs`** — Added two structs and two functions:
+
+- **`AppOwner`** struct — holds the `login` field for the app's owner
+- **`AppInfo`** struct — holds `slug` and `owner` (an `AppOwner`), both derived from `Deserialize`
+- **`get_authenticated_app(client, jwt, base_url)`** — calls `GET {base_url}/app` with Bearer JWT auth, returns `AppInfo` on 200, error on 401/other
+- **`is_app_public(client, slug, base_url)`** — calls `GET {base_url}/apps/{slug}` **without** auth, returns `Ok(true)` on 200, `Ok(false)` on 404, error on other
+
+**5 new tests** added to the test module:
+- `get_authenticated_app_success` — verifies 200 response is parsed into `AppInfo`
+- `get_authenticated_app_auth_failure` — verifies 401 returns authentication error
+- `is_app_public_returns_true_on_200` — public app returns true
+- `is_app_public_returns_false_on_404` — private app returns false
+- `is_app_public_no_auth_header` — verifies no `Authorization` header is sent (using `Matcher::Missing`)
+
+**2. `lib/crates/fabro-cli/src/init.rs`** — Updated `check_github_app_installation`:
+
+In the `Ok(false)` branch (app not installed), before showing the install URL, added best-effort checks:
+1. Calls `get_authenticated_app()` to get the app's owner
+2. Compares `app_info.owner.login` with the repo `owner` (case-insensitive via `eq_ignore_ascii_case`)
+3. If they differ, calls `is_app_public()` to check visibility
+4. If the app is private and owners differ, shows a targeted warning about making the app public
+
+All checks are best-effort — failures at any step are silently ignored and the existing generic warning still shows.
\ No newline at end of file
diff --git a/nodes/implement/status.json b/nodes/implement/status.json
new file mode 100644
index 000000000..ea5e796c2
--- /dev/null
+++ b/nodes/implement/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "success",
+  "notes": "Stage completed: implement",
+  "failure_reason": null,
+  "timestamp": "2026-03-19T15:08:46.450407+00:00"
+}
\ No newline at end of file