diff --git a/checkpoint.json b/checkpoint.json
index 82978f370..eb6d6185a 100644
--- a/checkpoint.json
+++ b/checkpoint.json
@@ -1,6 +1,6 @@
 {
-  "timestamp": "2026-03-19T15:35:24.096863Z",
-  "current_node": "simplify_gpt",
+  "timestamp": "2026-03-19T15:36:44.673241Z",
+  "current_node": "verify",
   "completed_nodes": [
     "start",
     "toolchain",
@@ -9,7 +9,8 @@
     "implement",
     "simplify_opus",
     "simplify_gemini",
-    "simplify_gpt"
+    "simplify_gpt",
+    "verify"
   ],
   "node_retries": {
     "start": 1,
@@ -17,6 +18,7 @@
     "simplify_opus": 1,
     "preflight_lint": 1,
     "implement": 1,
+    "verify": 1,
     "toolchain": 1,
     "simplify_gpt": 1,
     "preflight_compile": 1
@@ -30,6 +32,8 @@
     "command.stderr": "",
     "response.simplify_opus": "## Summary\n\n**One issue found and fixed:**\n\n**Bug in `build_segment_batch`: non-object JSON values silently bypassed `\"type\": \"track\"` injection** (Code Quality finding). The original code parsed each line as `serde_json::Value`, then used `if let Some(map) = obj.as_object_mut()` to inject the type field — but `batch.push(obj)` was *outside* the `if let`, meaning non-object JSON (numbers, strings, arrays) would be added to the batch without the required `\"type\"` field.\n\n**Fix:** Changed the parse target from `serde_json::Value` to `serde_json::Map<String, serde_json::Value>`. This:\n- Rejects non-object JSON at parse time (falls through to the `Err`/warn branch)\n- Eliminates the `if let` conditional entirely — the `\"type\"` injection always runs\n- Is simpler (fewer lines, no conditional branching)\n\n**Other findings reviewed and deemed clean:**\n- No code reuse opportunities missed (no existing JSONL utilities, UUID usage is standard, base64 auth pattern is Segment-specific)\n- `lines.is_empty()` guard in `spawn_sender` is correctly defensive (serialization could fail for all tracks)\n- `reqwest::Client::new()` per call is acceptable (runs in a one-shot subprocess, matches panic sender pattern)\n- `Vec<String>` + `join` is fine for typical 1-5 event batches\n- `json!` import in tests is used",
     "thread.simplify_gemini.current_node": "simplify_gpt",
+    "thread.simplify_gpt.current_node": "verify",
+    "internal.retry_count.verify": 1,
     "internal.run_id": "01KM3AVN0Z99W7AX4PCVEB8C9J",
     "last_stage": "simplify_gpt",
     "graph.rankdir": "LR",
@@ -38,12 +42,12 @@
     "thread.start.current_node": "toolchain",
     "thread.toolchain.current_node": "preflight_compile",
     "internal.fidelity": "compact",
-    "internal.thread_id": "simplify_gemini",
+    "internal.thread_id": "simplify_gpt",
     "response.implement": "Here's a summary of all changes made:\n\n### `lib/crates/fabro-util/src/telemetry/sender.rs` — rewritten\n\n**Writer side:**\n- Renamed `send(track: Track)` → `emit(tracks: &[Track])` — accepts a slice of events\n- Early returns if `SEGMENT_WRITE_KEY` is `None` or `tracks` is empty\n- `spawn_sender` serializes each `Track` as a compact JSON line, joins with `\\n`, generates a `fabro-events-{uuid}.jsonl` filename\n\n**Reader side:**\n- Renamed `send_to_segment()` → `upload()` — reads file as string, delegates to `build_segment_batch`, POSTs to `/v1/batch`\n- New pure function `build_segment_batch(content: &str) -> Option<Value>` — parses each non-empty JSONL line, injects `\"type\": \"track\"`, wraps in `{\"batch\": [...]}`, skips malformed lines with `tracing::warn!`\n\n**Constants:**\n- `SEGMENT_API_URL` changed from `.../v1/track` to `.../v1/batch`\n- Added `use uuid::Uuid` (removed unused `Track.message_id` dependency for filename)\n\n**Tests (9 total, all passing):**\n1. `build_segment_batch_empty_content` — empty string returns `None`\n2. `build_segment_batch_single_event` — one line produces batch with `\"type\": \"track\"`\n3. `build_segment_batch_multiple_events` — two lines produce batch of 2\n4. `build_segment_batch_skips_malformed_lines` — bad JSON lines are skipped\n5. `build_segment_batch_all_malformed` — all bad lines returns `None`\n6. `build_segment_batch_skips_blank_lines` — blank lines are ignored\n7. `emit_noops_without_write_key` — no-ops without compile-time key\n8. `emit_noops_with_empty_tracks` — no-ops on empty slice\n9. `upload_noops_without_write_key` — errors without compile-time key\n\n### `lib/crates/fabro-cli/src/main.rs` — two call sites updated\n\n- Line 429: `sender::send(track)` → `sender::emit(&[track])`\n- Line 911: `sender::send_to_segment(&path)` → `sender::upload(&path)`\n\n### Unchanged files (as planned)\n- `event.rs`, `panic.rs`, `mod.rs`, `spawn.rs`, `anonymous_id.rs`, `context.rs`, `git.rs`, `sanitize.rs` — no changes needed",
-    "command.output": "",
+    "command.output": "────────────\n Nextest run ID 15cfffe3-abba-4e23-814e-ac96487f3a46 with nextest profile: default\n    Starting 3220 tests across 45 binaries (179 tests skipped)\n────────────\n     Summary [  16.379s] 3220 tests run: 3220 passed, 179 skipped\n",
     "internal.retry_count.preflight_lint": 1,
     "internal.node_visit_count": 1,
-    "current.preamble": "Goal: # Plan: JSONL analytics event file format\n\n## Context\n\nCurrently each CLI invocation writes a single `Track` event as a standalone JSON file (`~/.fabro/tmp/fabro-event-{uuid}.json`) and spawns a detached subprocess to send it. We want to switch to JSONL format (one JSON event per line) so a single file can contain multiple events. Filenames keep a UUID for uniqueness. This enables callers to batch multiple events into one file/subprocess.\n\nThe panic sender (`__send_panic`) is unaffected — it stays single-JSON-per-file.\n\n## Changes\n\n### 1. `lib/crates/fabro-util/src/telemetry/sender.rs` — rewrite\n\n**Writer — rename `send()` to `emit()`, accept multiple events:**\n- `pub fn emit(tracks: &[Track])` (was `pub fn send(track: Track)`)\n- Early return if `SEGMENT_WRITE_KEY` is `None` or `tracks` is empty\n- Generate a UUID for the filename: `fabro-events-{uuid}.jsonl`\n- Serialize each `Track` as a compact JSON line (`serde_json::to_string`), join with `\\n`\n- Pass the bytes to `spawn_fabro_subcommand(\"__send_analytics\", &filename, &json)` as before\n\nNo file locking needed — each invocation writes its own uniquely-named file.\n\n**Reader — rename `send_to_segment()` to `upload()`:**\n- Read file contents as string\n- Parse each non-empty line as `serde_json::Value`, inject `\"type\": \"track\"`, collect into batch array\n- Skip malformed lines with `tracing::warn!`\n- If no valid events, return `Ok(())`\n- POST to `https://api.segment.io/v1/batch` with payload `{\"batch\": [...]}`\n- Keep Basic auth the same\n\nExtract a pure `fn build_segment_batch(content: &str) -> Option<Value>` for testability.\n\n**Constants:**\n- Change `SEGMENT_API_URL` from `.../v1/track` to `.../v1/batch`\n\n### 2. `lib/crates/fabro-cli/src/main.rs`\n\n**`send_telemetry_event()` (~line 428):** Change call from `sender::send(track)` to `sender::emit(&[track])`.\n\n**`SendAnalytics` handler (~line 910):** Change call from `sender::send_to_segment(&path)` to `sender::upload(&path)`.\n\n### 3. `lib/crates/fabro-util/src/telemetry/spawn.rs` — no changes\n\n`spawn_fabro_subcommand` is generic (takes raw bytes). It continues to work for both JSONL analytics files and single-JSON panic files.\n\n### 4. No changes to these files\n- `event.rs` — `Track` struct unchanged\n- `panic.rs` — stays single-JSON-per-file\n- `mod.rs`, `anonymous_id.rs`, `context.rs`, `git.rs`, `sanitize.rs` — unchanged\n\n## Implementation order (red/green TDD)\n\nWrite each test first (red), then implement just enough to make it pass (green).\n\n### Step 1: `build_segment_batch` — pure function, no I/O\n\n1. **Red:** Write test `build_segment_batch_empty_content` — empty string returns `None`\n2. **Green:** Add `fn build_segment_batch(content: &str) -> Option<Value>` stub returning `None`\n3. **Red:** Write test `build_segment_batch_single_event` — one JSONL line produces `{\"batch\": [{\"type\": \"track\", ...}]}`\n4. **Green:** Implement line parsing, `\"type\": \"track\"` injection, batch wrapping\n5. **Red:** Write test `build_segment_batch_multiple_events` — two lines produce batch of 2\n6. **Green:** Should already pass\n7. **Red:** Write test `build_segment_batch_skips_malformed_lines` — one good + one bad line produces batch of 1\n8. **Green:** Add `continue` on parse error\n\n### Step 2: `emit()` — writer side\n\n9. **Red:** Update existing `send_noops_without_write_key` to use `emit(&[track])` signature\n10. **Green:** Rename `send` to `emit`, change signature to `&[Track]`, serialize as JSONL (one JSON line per track, joined with `\\n`), generate `fabro-events-{uuid}.jsonl` filename\n\n### Step 3: `upload()` — reader side\n\n11. **Red:** Write test `upload_noops_without_write_key` — same pattern as existing `send_panic_noops_without_dsn`\n12. **Green:** Rename `send_to_segment` to `upload`, change internals to read file as string, call `build_segment_batch`, POST to `/v1/batch`\n\n### Step 4: Wire up call sites in `main.rs`\n\n13. Update `send_telemetry_event()` to call `sender::emit(&[track])`\n14. Update `SendAnalytics` handler to call `sender::upload(&path)`\n\n### Step 5: Final checks\n\n```bash\ncargo fmt --check --all\ncargo clippy --workspace -- -D warnings\ncargo test -p fabro-util\ncargo test --workspace\n```\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- **implement**: success\n  - Model: claude-opus-4-6, 38.6k tokens in / 4.6k out\n  - Files: /home/daytona/workspace/lib/crates/fabro-cli/src/main.rs, /home/daytona/workspace/lib/crates/fabro-util/src/telemetry/sender.rs\n- **simplify_opus**: success\n  - Model: claude-opus-4-6, 21.3k tokens in / 7.9k out\n  - Files: /home/daytona/workspace/lib/crates/fabro-util/src/telemetry/sender.rs\n- **simplify_gemini**: success\n  - Model: claude-opus-4-6, 26.4k tokens in / 10.3k out\n",
+    "current.preamble": "Goal: # Plan: JSONL analytics event file format\n\n## Context\n\nCurrently each CLI invocation writes a single `Track` event as a standalone JSON file (`~/.fabro/tmp/fabro-event-{uuid}.json`) and spawns a detached subprocess to send it. We want to switch to JSONL format (one JSON event per line) so a single file can contain multiple events. Filenames keep a UUID for uniqueness. This enables callers to batch multiple events into one file/subprocess.\n\nThe panic sender (`__send_panic`) is unaffected — it stays single-JSON-per-file.\n\n## Changes\n\n### 1. `lib/crates/fabro-util/src/telemetry/sender.rs` — rewrite\n\n**Writer — rename `send()` to `emit()`, accept multiple events:**\n- `pub fn emit(tracks: &[Track])` (was `pub fn send(track: Track)`)\n- Early return if `SEGMENT_WRITE_KEY` is `None` or `tracks` is empty\n- Generate a UUID for the filename: `fabro-events-{uuid}.jsonl`\n- Serialize each `Track` as a compact JSON line (`serde_json::to_string`), join with `\\n`\n- Pass the bytes to `spawn_fabro_subcommand(\"__send_analytics\", &filename, &json)` as before\n\nNo file locking needed — each invocation writes its own uniquely-named file.\n\n**Reader — rename `send_to_segment()` to `upload()`:**\n- Read file contents as string\n- Parse each non-empty line as `serde_json::Value`, inject `\"type\": \"track\"`, collect into batch array\n- Skip malformed lines with `tracing::warn!`\n- If no valid events, return `Ok(())`\n- POST to `https://api.segment.io/v1/batch` with payload `{\"batch\": [...]}`\n- Keep Basic auth the same\n\nExtract a pure `fn build_segment_batch(content: &str) -> Option<Value>` for testability.\n\n**Constants:**\n- Change `SEGMENT_API_URL` from `.../v1/track` to `.../v1/batch`\n\n### 2. `lib/crates/fabro-cli/src/main.rs`\n\n**`send_telemetry_event()` (~line 428):** Change call from `sender::send(track)` to `sender::emit(&[track])`.\n\n**`SendAnalytics` handler (~line 910):** Change call from `sender::send_to_segment(&path)` to `sender::upload(&path)`.\n\n### 3. `lib/crates/fabro-util/src/telemetry/spawn.rs` — no changes\n\n`spawn_fabro_subcommand` is generic (takes raw bytes). It continues to work for both JSONL analytics files and single-JSON panic files.\n\n### 4. No changes to these files\n- `event.rs` — `Track` struct unchanged\n- `panic.rs` — stays single-JSON-per-file\n- `mod.rs`, `anonymous_id.rs`, `context.rs`, `git.rs`, `sanitize.rs` — unchanged\n\n## Implementation order (red/green TDD)\n\nWrite each test first (red), then implement just enough to make it pass (green).\n\n### Step 1: `build_segment_batch` — pure function, no I/O\n\n1. **Red:** Write test `build_segment_batch_empty_content` — empty string returns `None`\n2. **Green:** Add `fn build_segment_batch(content: &str) -> Option<Value>` stub returning `None`\n3. **Red:** Write test `build_segment_batch_single_event` — one JSONL line produces `{\"batch\": [{\"type\": \"track\", ...}]}`\n4. **Green:** Implement line parsing, `\"type\": \"track\"` injection, batch wrapping\n5. **Red:** Write test `build_segment_batch_multiple_events` — two lines produce batch of 2\n6. **Green:** Should already pass\n7. **Red:** Write test `build_segment_batch_skips_malformed_lines` — one good + one bad line produces batch of 1\n8. **Green:** Add `continue` on parse error\n\n### Step 2: `emit()` — writer side\n\n9. **Red:** Update existing `send_noops_without_write_key` to use `emit(&[track])` signature\n10. **Green:** Rename `send` to `emit`, change signature to `&[Track]`, serialize as JSONL (one JSON line per track, joined with `\\n`), generate `fabro-events-{uuid}.jsonl` filename\n\n### Step 3: `upload()` — reader side\n\n11. **Red:** Write test `upload_noops_without_write_key` — same pattern as existing `send_panic_noops_without_dsn`\n12. **Green:** Rename `send_to_segment` to `upload`, change internals to read file as string, call `build_segment_batch`, POST to `/v1/batch`\n\n### Step 4: Wire up call sites in `main.rs`\n\n13. Update `send_telemetry_event()` to call `sender::emit(&[track])`\n14. Update `SendAnalytics` handler to call `sender::upload(&path)`\n\n### Step 5: Final checks\n\n```bash\ncargo fmt --check --all\ncargo clippy --workspace -- -D warnings\ncargo test -p fabro-util\ncargo test --workspace\n```\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- **implement**: success\n  - Model: claude-opus-4-6, 38.6k tokens in / 4.6k out\n  - Files: /home/daytona/workspace/lib/crates/fabro-cli/src/main.rs, /home/daytona/workspace/lib/crates/fabro-util/src/telemetry/sender.rs\n- **simplify_opus**: success\n  - Model: claude-opus-4-6, 21.3k tokens in / 7.9k out\n  - Files: /home/daytona/workspace/lib/crates/fabro-util/src/telemetry/sender.rs\n- **simplify_gemini**: success\n  - Model: claude-opus-4-6, 26.4k tokens in / 10.3k out\n- **simplify_gpt**: success\n  - Model: claude-opus-4-6, 23.5k tokens in / 8.2k out\n  - Files: /home/daytona/workspace/lib/crates/fabro-util/src/telemetry/sender.rs\n",
     "graph.model_stylesheet": "\n            * { backend: api; model: claude-opus-4-6;}\n        ",
     "failure_signature": "",
     "thread.preflight_lint.current_node": "implement",
@@ -51,7 +55,7 @@
     "thread.preflight_compile.current_node": "preflight_lint",
     "response.simplify_gemini": "All clean. Formatting passes, clippy passes with no warnings, and all 117 tests in `fabro-util` pass.\n\n**Summary:** The code is already clean — no changes needed. All three review agents confirmed the implementation is well-structured:\n- **No code reuse issues** — no duplicated utilities\n- **No quality issues worth fixing** — the one finding (typed vs untyped JSON map) adds complexity without meaningful benefit for this internal protocol detail\n- **No efficiency issues** — the batched approach is a net improvement over the prior single-event design",
     "internal.retry_count.implement": 1,
-    "current_node": "simplify_gpt",
+    "current_node": "verify",
     "thread.implement.current_node": "simplify_opus",
     "internal.retry_count.simplify_gemini": 1,
     "response.simplify_gpt": "All clean. Here's the summary:\n\n## Review Summary\n\n**Three parallel review agents examined the diff for code reuse, quality, and efficiency.**\n\n### Findings\n\n1. **Minor verbosity (fixed):** `serde_json::Value::String(\"track\".to_string())` in `build_segment_batch` was unnecessarily verbose. Simplified to `\"track\".into()` since `serde_json::Value` implements `From<&str>`.\n\n### Everything else was already clean:\n\n- **Code reuse:** `uuid` was already a workspace dependency used elsewhere in the telemetry module. The `spawn_fabro_subcommand` pattern is properly shared. No JSONL helpers exist elsewhere that could be reused — this is the only JSONL producer/consumer.\n- **Code quality:** Error handling is consistent with `panic.rs` (both use `.ok_or_else(|| anyhow!(...))` for compile-time keys). The `filter_map(|t| ...ok())` in `spawn_sender` is appropriate since serialization failure of a telemetry struct is not actionable. Test patterns match the existing `send_panic_noops_without_dsn` test.\n- **Efficiency:** No concerns — this is once-per-CLI-invocation telemetry code. The parse-then-reserialize pattern in `upload()` is inherent to the JSONL→batch transformation (need to inject `\"type\": \"track\"` into each event). No TOCTOU issues since each file has a unique UUID name.",
@@ -146,6 +150,15 @@
       },
       "duration_ms": 236594
     },
+    "verify": {
+      "status": "success",
+      "context_updates": {
+        "command.output": "────────────\n Nextest run ID 15cfffe3-abba-4e23-814e-ac96487f3a46 with nextest profile: default\n    Starting 3220 tests across 45 binaries (179 tests skipped)\n────────────\n     Summary [  16.379s] 3220 tests run: 3220 passed, 179 skipped\n",
+        "command.stderr": ""
+      },
+      "notes": "Script completed: cargo clippy -q --workspace -- -D warnings 2>&1 && cargo nextest run --cargo-quiet --workspace --status-level fail 2>&1",
+      "duration_ms": 76736
+    },
     "toolchain": {
       "status": "success",
       "context_updates": {
@@ -178,7 +191,7 @@
       "duration_ms": 185945
     }
   },
-  "next_node_id": "verify",
+  "next_node_id": "fmt",
   "node_visits": {
     "start": 1,
     "toolchain": 1,
@@ -186,6 +199,7 @@
     "simplify_gpt": 1,
     "implement": 1,
     "simplify_gemini": 1,
+    "verify": 1,
     "simplify_opus": 1,
     "preflight_lint": 1
   }
diff --git a/nodes/simplify_gpt/diff.patch b/nodes/simplify_gpt/diff.patch
new file mode 100644
index 000000000..fba1e27d8
--- /dev/null
+++ b/nodes/simplify_gpt/diff.patch
@@ -0,0 +1,16 @@
+diff --git a/lib/crates/fabro-util/src/telemetry/sender.rs b/lib/crates/fabro-util/src/telemetry/sender.rs
+index 1c1018aa..48025cab 100644
+--- a/lib/crates/fabro-util/src/telemetry/sender.rs
++++ b/lib/crates/fabro-util/src/telemetry/sender.rs
+@@ -56,10 +56,7 @@ fn build_segment_batch(content: &str) -> Option<serde_json::Value> {
+         }
+         match serde_json::from_str::<serde_json::Map<String, serde_json::Value>>(line) {
+             Ok(mut map) => {
+-                map.insert(
+-                    "type".to_string(),
+-                    serde_json::Value::String("track".to_string()),
+-                );
++                map.insert("type".into(), "track".into());
+                 batch.push(serde_json::Value::Object(map));
+             }
+             Err(err) => {
diff --git a/nodes/verify/script_invocation.json b/nodes/verify/script_invocation.json
new file mode 100644
index 000000000..c2b2fcf73
--- /dev/null
+++ b/nodes/verify/script_invocation.json
@@ -0,0 +1,5 @@
+{
+  "command": "cargo clippy -q --workspace -- -D warnings 2>&1 && cargo nextest run --cargo-quiet --workspace --status-level fail 2>&1",
+  "language": "shell",
+  "timeout_ms": null
+}
\ No newline at end of file
diff --git a/nodes/verify/script_timing.json b/nodes/verify/script_timing.json
new file mode 100644
index 000000000..611482efa
--- /dev/null
+++ b/nodes/verify/script_timing.json
@@ -0,0 +1,5 @@
+{
+  "duration_ms": 76734,
+  "exit_code": 0,
+  "timed_out": false
+}
\ No newline at end of file
diff --git a/nodes/verify/status.json b/nodes/verify/status.json
new file mode 100644
index 000000000..c6207777d
--- /dev/null
+++ b/nodes/verify/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "success",
+  "notes": "Script completed: cargo clippy -q --workspace -- -D warnings 2>&1 && cargo nextest run --cargo-quiet --workspace --status-level fail 2>&1",
+  "failure_reason": null,
+  "timestamp": "2026-03-19T15:36:44.672717+00:00"
+}
\ No newline at end of file