diff --git a/run.json b/run.json
index e63632f28..f188f8195 100644
--- a/run.json
+++ b/run.json
@@ -516,7 +516,7 @@
     "kind": "running"
   },
   "status_updated_at": "2026-05-21T22:36:05.837824Z",
-  "last_event_at": "2026-05-21T22:36:08.268871Z",
+  "last_event_at": "2026-05-21T22:36:20.631978Z",
   "pending_control": null,
   "checkpoints": [
     {
@@ -557,21 +557,80 @@
       "diff": {}
     },
     {
-      "seq": 0,
+      "seq": 27,
       "checkpoint": {
-        "timestamp": "2026-05-21T22:36:09.941410Z",
+        "timestamp": "2026-05-21T22:36:20.631013Z",
         "current_node": "toolchain",
         "completed_nodes": [
           "start",
           "toolchain"
         ],
         "node_retries": {},
+        "context_values": {
+          "outcome": "succeeded",
+          "internal.work_dir": "/home/daytona/workspace/fabro",
+          "graph.rankdir": "LR",
+          "internal.thread_id": "start",
+          "internal.retry_count.toolchain": 0,
+          "thread.start.current_node": "toolchain",
+          "failure_class": "",
+          "internal.fidelity": "compact",
+          "current_node": "toolchain",
+          "failure_signature": "",
+          "graph.goal": "# Plan: Compute LLM cost on-read for in-flight stages\n\n## Context\n\nOn the run billing page (`/runs/{id}/billing`), an active stage shows token\nusage but no dollar cost — cost renders as `—` until the stage completes.\n\nRoot cause: while a stage runs, `AgentMessage` events carry usage built by\n`billed_token_counts_from_llm` (`fabro-workflow/src/outcome.rs:43`), which\nhard-codes `total_usd_micros: None`. Dollar cost is only computed by\n`billed_model_usage_from_llm` (`outcome.rs:14`) — which needs the pricing\n`Catalog` — and that runs only on `StageCompleted`/`PromptCompleted`/`StageFailed`.\nSo an in-flight stage's `StageProjection.usage.total_usd_micros` stays `None`.\n\nFix: price stages whose cost is `None` when the billing rollup is built for a\nread request, using the model + token counts already in the projection. The\nwire contract is unchanged (`total_usd_micros` is already nullable everywhere)\nand the frontend already renders whatever value comes back — no UI change.\n\n## Decisions\n\n- **Price any stage with `total_usd_micros == None`**, not just in-flight ones.\n  Completed stages with unpriceable providers (`BillingPolicy::None`) return\n  `None` again — harmless; no need to thread `StageState`.\n- **No \"estimated\" label.** Cost-so-far is exact for tokens consumed so far,\n  matching the already-unlabeled live token counts and ticking runtime.\n- **Aggregate billing stays finalized-only.** The `BillingAccumulator` call\n  sites pass `None` so a run's running estimate is never folded into org-wide\n  totals (avoids double-count when the run later finalizes).\n- Per-stage rows, `totals`, and `by_model` are all priced from the same source\n  so the billing page stays internally consistent.\n\n## Changes\n\n### 1. `lib/crates/fabro-model/src/billing.rs`\n\n- Add `BilledTokenCounts::token_counts(&self) -> TokenCounts` — drops\n  `total_tokens`/`total_usd_micros`, keeps the five disjoint buckets.\n- Add `Catalog::price_tokens(&self, model: &ModelRef, tokens: &TokenCounts) -> Option<i64>`\n  next to `pricing_for`/`billing_facts_for`. Body mirrors the cost lines of\n  `billed_model_usage_from_llm`: build `ModelBillingFacts` via\n  `billing_facts_for`, assemble `ModelBillingInput { ModelUsage { model, tokens }, facts }`,\n  then `pricing_for(model).and_then(|p| p.bill(&input)).map(|a| a.0)`. Returns\n  `None` when the provider has no billing policy.\n\n### 2. `lib/crates/fabro-workflow/src/billing_rollup.rs`\n\n- Change signature to\n  `billing_rollup_from_projection(projection: &RunProjection, catalog: Option<&Catalog>)`.\n- Add a module-private helper `stage_usage_with_cost(catalog, stage) -> BilledTokenCounts`:\n  clone `stage.usage`; if `total_usd_micros.is_none()` and both `catalog` and\n  `stage.model` are present, set it via `catalog.price_tokens(model, &usage.token_counts())`.\n- In the loop, compute `priced` once per stage and use it in place of\n  `&stage.usage` for the `is_zero` check, `row.billing.add_counts`,\n  `totals.add_counts`, and `model_entry.billing.add_counts`.\n- Update the existing tests to pass `None`; add one new test: an in-flight\n  stage (no `completion`, non-zero `usage` with `total_usd_micros: None`, a\n  builtin `model`) yields `Some(..)` cost on the stage row and in `totals` when\n  called with `Some(Catalog::builtin())`.\n\n### 3. Call sites of `billing_rollup_from_projection`\n\n- `lib/crates/fabro-server/src/server/handler/billing.rs:82` — bind\n  `let catalog = state.catalog();` (returns `Arc<Catalog>`) and pass\n  `Some(&catalog)`.\n- `lib/crates/fabro-server/src/server.rs` (2 aggregate-billing sites) — pass `None`.\n- `lib/crates/fabro-workflow/src/pipeline/finalize.rs` (4 sites) — pass `None`\n  (stages already priced at completion; pricing would be a no-op anyway).\n\nNo changes to `fabro-api.yaml`, the generated clients, or `apps/fabro-web`.\n\n## Out of scope / known limitation\n\nIn-flight **prompt** stages have no `model` until `PromptCompleted` (only\n`AgentMessage` sets `stage.model` mid-run), so they still show `—` while\nrunning. Acceptable: prompt stages are a single short LLM call. The bug report\nconcerns agent stages, where `model` is available.\n\n## Verification\n\n- `cargo nextest run -p fabro-workflow billing_rollup` — new + updated unit tests pass.\n- `cargo nextest run -p fabro-server billing` — handler conformance still passes.\n- `cargo build --workspace` and `cargo +nightly-2026-04-14 clippy --workspace --all-targets -- -D warnings`.\n- Manual: `fabro server start` + `cd apps/fabro-web && bun run dev`, start a\n  workflow with an agent stage, open `/runs/{id}/billing` mid-run — the active\n  stage row and totals show a non-`—` dollar amount that grows with tokens.\n",
+          "graph.model_stylesheet": "\n            * { model: claude-opus-4-7; }\n        ",
+          "command.output": "blob://sha256/fc14b2ba2d770e5cd3169df7a29525c962adfc4cfa3097b9098c63ebd61a748c",
+          "internal.run_id": "01KS6AW28FZVV4M2EHBJA7JMNP",
+          "internal.node_visit_count": 1,
+          "internal.retry_count.start": 0
+        },
+        "node_outcomes": {
+          "toolchain": {
+            "status": "succeeded",
+            "context_updates": {
+              "command.output": "blob://sha256/fc14b2ba2d770e5cd3169df7a29525c962adfc4cfa3097b9098c63ebd61a748c"
+            },
+            "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",
+            "usage": null
+          },
+          "start": {
+            "status": "succeeded",
+            "usage": null
+          }
+        },
+        "next_node_id": "preflight_compile",
+        "git_commit_sha": "f94bd29597ee8f3cb24d01a47f364e7488915fa0",
+        "node_visits": {
+          "start": 1,
+          "toolchain": 1
+        }
+      },
+      "diff": {
+        "summary": {
+          "files_changed": 0,
+          "additions": 0,
+          "deletions": 0
+        }
+      }
+    },
+    {
+      "seq": 0,
+      "checkpoint": {
+        "timestamp": "2026-05-21T22:40:26.986061Z",
+        "current_node": "preflight_compile",
+        "completed_nodes": [
+          "start",
+          "toolchain",
+          "preflight_compile"
+        ],
+        "node_retries": {},
         "context_values": {
           "graph.rankdir": "LR",
           "internal.node_visit_count": 1,
+          "thread.toolchain.current_node": "preflight_compile",
           "outcome": "succeeded",
-          "command.output": "blob://sha256/fc14b2ba2d770e5cd3169df7a29525c962adfc4cfa3097b9098c63ebd61a748c",
-          "internal.thread_id": "start",
+          "command.output": "blob://sha256/12ae32cb1ec02d01eda3581b127c1fee3b0dc53572ed6baf239721a03d82e126",
+          "internal.thread_id": "toolchain",
           "graph.goal": "# Plan: Compute LLM cost on-read for in-flight stages\n\n## Context\n\nOn the run billing page (`/runs/{id}/billing`), an active stage shows token\nusage but no dollar cost — cost renders as `—` until the stage completes.\n\nRoot cause: while a stage runs, `AgentMessage` events carry usage built by\n`billed_token_counts_from_llm` (`fabro-workflow/src/outcome.rs:43`), which\nhard-codes `total_usd_micros: None`. Dollar cost is only computed by\n`billed_model_usage_from_llm` (`outcome.rs:14`) — which needs the pricing\n`Catalog` — and that runs only on `StageCompleted`/`PromptCompleted`/`StageFailed`.\nSo an in-flight stage's `StageProjection.usage.total_usd_micros` stays `None`.\n\nFix: price stages whose cost is `None` when the billing rollup is built for a\nread request, using the model + token counts already in the projection. The\nwire contract is unchanged (`total_usd_micros` is already nullable everywhere)\nand the frontend already renders whatever value comes back — no UI change.\n\n## Decisions\n\n- **Price any stage with `total_usd_micros == None`**, not just in-flight ones.\n  Completed stages with unpriceable providers (`BillingPolicy::None`) return\n  `None` again — harmless; no need to thread `StageState`.\n- **No \"estimated\" label.** Cost-so-far is exact for tokens consumed so far,\n  matching the already-unlabeled live token counts and ticking runtime.\n- **Aggregate billing stays finalized-only.** The `BillingAccumulator` call\n  sites pass `None` so a run's running estimate is never folded into org-wide\n  totals (avoids double-count when the run later finalizes).\n- Per-stage rows, `totals`, and `by_model` are all priced from the same source\n  so the billing page stays internally consistent.\n\n## Changes\n\n### 1. `lib/crates/fabro-model/src/billing.rs`\n\n- Add `BilledTokenCounts::token_counts(&self) -> TokenCounts` — drops\n  `total_tokens`/`total_usd_micros`, keeps the five disjoint buckets.\n- Add `Catalog::price_tokens(&self, model: &ModelRef, tokens: &TokenCounts) -> Option<i64>`\n  next to `pricing_for`/`billing_facts_for`. Body mirrors the cost lines of\n  `billed_model_usage_from_llm`: build `ModelBillingFacts` via\n  `billing_facts_for`, assemble `ModelBillingInput { ModelUsage { model, tokens }, facts }`,\n  then `pricing_for(model).and_then(|p| p.bill(&input)).map(|a| a.0)`. Returns\n  `None` when the provider has no billing policy.\n\n### 2. `lib/crates/fabro-workflow/src/billing_rollup.rs`\n\n- Change signature to\n  `billing_rollup_from_projection(projection: &RunProjection, catalog: Option<&Catalog>)`.\n- Add a module-private helper `stage_usage_with_cost(catalog, stage) -> BilledTokenCounts`:\n  clone `stage.usage`; if `total_usd_micros.is_none()` and both `catalog` and\n  `stage.model` are present, set it via `catalog.price_tokens(model, &usage.token_counts())`.\n- In the loop, compute `priced` once per stage and use it in place of\n  `&stage.usage` for the `is_zero` check, `row.billing.add_counts`,\n  `totals.add_counts`, and `model_entry.billing.add_counts`.\n- Update the existing tests to pass `None`; add one new test: an in-flight\n  stage (no `completion`, non-zero `usage` with `total_usd_micros: None`, a\n  builtin `model`) yields `Some(..)` cost on the stage row and in `totals` when\n  called with `Some(Catalog::builtin())`.\n\n### 3. Call sites of `billing_rollup_from_projection`\n\n- `lib/crates/fabro-server/src/server/handler/billing.rs:82` — bind\n  `let catalog = state.catalog();` (returns `Arc<Catalog>`) and pass\n  `Some(&catalog)`.\n- `lib/crates/fabro-server/src/server.rs` (2 aggregate-billing sites) — pass `None`.\n- `lib/crates/fabro-workflow/src/pipeline/finalize.rs` (4 sites) — pass `None`\n  (stages already priced at completion; pricing would be a no-op anyway).\n\nNo changes to `fabro-api.yaml`, the generated clients, or `apps/fabro-web`.\n\n## Out of scope / known limitation\n\nIn-flight **prompt** stages have no `model` until `PromptCompleted` (only\n`AgentMessage` sets `stage.model` mid-run), so they still show `—` while\nrunning. Acceptable: prompt stages are a single short LLM call. The bug report\nconcerns agent stages, where `model` is available.\n\n## Verification\n\n- `cargo nextest run -p fabro-workflow billing_rollup` — new + updated unit tests pass.\n- `cargo nextest run -p fabro-server billing` — handler conformance still passes.\n- `cargo build --workspace` and `cargo +nightly-2026-04-14 clippy --workspace --all-targets -- -D warnings`.\n- Manual: `fabro server start` + `cd apps/fabro-web && bun run dev`, start a\n  workflow with an agent stage, open `/runs/{id}/billing` mid-run — the active\n  stage row and totals show a non-`—` dollar amount that grows with tokens.\n",
           "internal.work_dir": "/home/daytona/workspace/fabro",
           "thread.start.current_node": "toolchain",
@@ -581,14 +640,11 @@
           "failure_signature": "",
           "internal.run_id": "01KS6AW28FZVV4M2EHBJA7JMNP",
           "graph.model_stylesheet": "\n            * { model: claude-opus-4-7; }\n        ",
-          "current_node": "toolchain",
-          "internal.fidelity": "compact"
+          "current_node": "preflight_compile",
+          "internal.fidelity": "compact",
+          "internal.retry_count.preflight_compile": 0
         },
         "node_outcomes": {
-          "start": {
-            "status": "succeeded",
-            "usage": null
-          },
           "toolchain": {
             "status": "succeeded",
             "context_updates": {
@@ -596,10 +652,23 @@
             },
             "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",
             "usage": null
+          },
+          "start": {
+            "status": "succeeded",
+            "usage": null
+          },
+          "preflight_compile": {
+            "status": "succeeded",
+            "context_updates": {
+              "command.output": "blob://sha256/12ae32cb1ec02d01eda3581b127c1fee3b0dc53572ed6baf239721a03d82e126"
+            },
+            "notes": "Script completed: cargo check -q --workspace 2>&1",
+            "usage": null
           }
         },
-        "next_node_id": "preflight_compile",
+        "next_node_id": "preflight_lint",
         "node_visits": {
+          "preflight_compile": 1,
           "start": 1,
           "toolchain": 1
         }
@@ -628,22 +697,22 @@
   "superseded_by": null,
   "pending_interviews": {},
   "stages": {
-    "toolchain@1": {
-      "first_event_seq": 20,
+    "preflight_compile@1": {
+      "first_event_seq": 30,
       "prompt": null,
       "response": null,
       "completion": null,
       "provider_used": null,
       "diff": null,
       "script_invocation": {
-        "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",
-        "command": "exec 2>&1\ncommand -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",
+        "script": "cargo check -q --workspace 2>&1",
+        "command": "exec 2>&1\ncargo check -q --workspace 2>&1",
         "language": "shell"
       },
       "script_timing": null,
       "parallel_results": null,
       "output": null,
-      "started_at": "2026-05-21T22:36:08.268854Z",
+      "started_at": "2026-05-21T22:36:20.631710Z",
       "handler": "command",
       "usage": {
         "input_tokens": 0,
@@ -655,6 +724,49 @@
       },
       "state": "running"
     },
+    "toolchain@1": {
+      "first_event_seq": 20,
+      "prompt": null,
+      "response": null,
+      "completion": {
+        "outcome": "succeeded",
+        "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": "2026-05-21T22:36:09.940422Z"
+      },
+      "provider_used": null,
+      "diff": null,
+      "script_invocation": {
+        "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",
+        "command": "exec 2>&1\ncommand -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"
+      },
+      "script_timing": {
+        "output": "blob://sha256/fc14b2ba2d770e5cd3169df7a29525c962adfc4cfa3097b9098c63ebd61a748c",
+        "exit_code": 0,
+        "duration_ms": 1663,
+        "termination": "exited",
+        "output_bytes": 36,
+        "live_streaming": true
+      },
+      "parallel_results": null,
+      "output": null,
+      "output_bytes": 36,
+      "live_streaming": true,
+      "termination": "exited",
+      "started_at": "2026-05-21T22:36:08.268854Z",
+      "handler": "command",
+      "duration_ms": 1671,
+      "usage": {
+        "input_tokens": 0,
+        "output_tokens": 0,
+        "total_tokens": 0,
+        "reasoning_tokens": 0,
+        "cache_read_tokens": 0,
+        "cache_write_tokens": 0
+      },
+      "state": "succeeded"
+    },
     "start@1": {
       "first_event_seq": 16,
       "prompt": null,
diff --git a/stages/002-toolchain@1/output.log b/stages/002-toolchain@1/output.log
new file mode 100644
index 000000000..4e86d161d
--- /dev/null
+++ b/stages/002-toolchain@1/output.log
@@ -0,0 +1 @@
+blob://sha256/fc14b2ba2d770e5cd3169df7a29525c962adfc4cfa3097b9098c63ebd61a748c
\ No newline at end of file
diff --git a/stages/002-toolchain@1/script_timing.json b/stages/002-toolchain@1/script_timing.json
new file mode 100644
index 000000000..044ea193a
--- /dev/null
+++ b/stages/002-toolchain@1/script_timing.json
@@ -0,0 +1,8 @@
+{
+  "output": "blob://sha256/fc14b2ba2d770e5cd3169df7a29525c962adfc4cfa3097b9098c63ebd61a748c",
+  "exit_code": 0,
+  "duration_ms": 1663,
+  "termination": "exited",
+  "output_bytes": 36,
+  "live_streaming": true
+}
\ No newline at end of file
diff --git a/stages/002-toolchain@1/status.json b/stages/002-toolchain@1/status.json
new file mode 100644
index 000000000..5afb92a6f
--- /dev/null
+++ b/stages/002-toolchain@1/status.json
@@ -0,0 +1,6 @@
+{
+  "outcome": "succeeded",
+  "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": "2026-05-21T22:36:09.940422Z"
+}
\ No newline at end of file
diff --git a/stages/003-preflight_compile@1/script_invocation.json b/stages/003-preflight_compile@1/script_invocation.json
new file mode 100644
index 000000000..d3abb832f
--- /dev/null
+++ b/stages/003-preflight_compile@1/script_invocation.json
@@ -0,0 +1,5 @@
+{
+  "script": "cargo check -q --workspace 2>&1",
+  "command": "exec 2>&1\ncargo check -q --workspace 2>&1",
+  "language": "shell"
+}
\ No newline at end of file