AM-4: gate scenario YAML, retarget on audited source, re-measure

Adopts both remediations from CB-EV-0001 §4 (maintainer decision).

Option A — serde_yaml is now optional behind cb-game-runtime's
`scenarios` feature. The scenario module, the ScenarioGame impl and the
string parsers behind it are cfg-gated; cb-sim opts in explicitly. Both
configurations compile and lint clean under -D warnings.

A trap worth recording: `default-features = false` on a *member*
dependency is silently ignored when the workspace dependency does not
specify it. The first attempt gated nothing while looking correct — the
build succeeded and cargo tree still showed all six YAML crates. Fixed
by setting it on the workspace dependency. This is the positive-control
failure mode in miniature: success was not evidence the change applied.

Retarget — AM-4 now measures third-party source under audit, split by
build configuration, replacing a crate count that was unreachable
without undoing K5/K7 and that does not compare across ecosystems.

Re-measured via the new `make dep-weight`, whose own positive control
refuses to report when any crate's source cannot be located:

  shipped runtime   23 crates   246,250 lines   target <=250,000  met
  dev toolchain     29 crates   317,021 lines   target <=350,000  met
  own source                      3,408 lines

Scenario tooling costs 70,771 lines a shipped game never compiles —
the split the single number was hiding.

Targets are set at current measurement plus headroom, so they bind on
future growth rather than retroactively passing what had failed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Cargo.toml

@@ -16,8 +16,8 @@ license-file = "LICENSE"
 [workspace.dependencies]
 cb-kernel = { path = "crates/cb-kernel" }
 cb-events = { path = "crates/cb-events" }
-cb-game-runtime = { path = "crates/cb-game-runtime" }
-games-ground = { path = "games/ground" }
+cb-game-runtime = { path = "crates/cb-game-runtime", default-features = false }
+games-ground = { path = "games/ground", default-features = false }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 serde_yaml = "0.9"

Makefile

@@ -15,6 +15,9 @@ test:
 	$(CARGO) test --workspace
 
 ## run all GROUND scenarios through cb-sim
+dep-weight:
+	python3 tools/dep-weight.py
+
 coverage:
 	python3 tools/rule-coverage.py
 

WORK-RECORDS.md

@@ -9,6 +9,7 @@
 | Kind | ID | Status | Lane | Source |
 | --- | --- | --- | --- | --- |
 | workplan | CB-WP-0001 | done | — | workplans/CB-WP-0001-inner-loop.md |
+| workplan | CB-WP-0002 | proposed | — | workplans/CB-WP-0002-cost-accounting.md |
 | task | CB-WP-0001-T01 | done | — | workplans/CB-WP-0001-inner-loop.md |
 | task | CB-WP-0001-T02 | done | — | workplans/CB-WP-0001-inner-loop.md |
 | task | CB-WP-0001-T03 | done | — | workplans/CB-WP-0001-inner-loop.md |
@@ -18,3 +19,10 @@
 | task | CB-WP-0001-T07 | done | — | workplans/CB-WP-0001-inner-loop.md |
 | task | CB-WP-0001-T08 | done | — | workplans/CB-WP-0001-inner-loop.md |
 | task | CB-WP-0001-T09 | done | — | workplans/CB-WP-0001-inner-loop.md |
+| task | CB-WP-0002-T01 | todo | — | workplans/CB-WP-0002-cost-accounting.md |
+| task | CB-WP-0002-T02 | todo | — | workplans/CB-WP-0002-cost-accounting.md |
+| task | CB-WP-0002-T03 | todo | — | workplans/CB-WP-0002-cost-accounting.md |
+| task | CB-WP-0002-T04 | todo | — | workplans/CB-WP-0002-cost-accounting.md |
+| task | CB-WP-0002-T05 | todo | — | workplans/CB-WP-0002-cost-accounting.md |
+| task | CB-WP-0002-T06 | todo | — | workplans/CB-WP-0002-cost-accounting.md |
+| task | CB-WP-0002-T07 | todo | — | workplans/CB-WP-0002-cost-accounting.md |

crates/cb-game-runtime/Cargo.toml

@@ -9,7 +9,14 @@ cb-kernel.workspace = true
 cb-events.workspace = true
 serde.workspace = true
 serde_json.workspace = true
-serde_yaml.workspace = true
+serde_yaml = { workspace = true, optional = true }
+
+[features]
+# Scenario files are a test-and-tooling concern: a shipped game runtime
+# parses no YAML. Default-on so `cargo test`/`cargo run` behave normally;
+# measure the shipped runtime with --no-default-features (AM-4).
+default = ["scenarios"]
+scenarios = ["dep:serde_yaml"]
 
 [lints]
 workspace = true

crates/cb-game-runtime/src/lib.rs

@@ -1,8 +1,10 @@
 //! cb-game-runtime — round/phase machinery, commit windows, projections,
 //! and the scenario runner (GameKernel §2.5, §3). Game-agnostic.
 
+#[cfg(feature = "scenarios")]
 pub mod scenario;
 
+#[cfg(feature = "scenarios")]
 pub use scenario::{parse_actor, run, CommandStep, RunOutcome, ScenarioFile, ScenarioGame, Setup};
 
 use cb_kernel::PlayerId;

evidence/CB-EV-0001-game-kernel.md

@@ -1,6 +1,6 @@
 # CB-EV-0001 — GROUND game kernel: acceptance evidence
 
-Status: **T08 complete, with one acceptance metric not met (AM-4).**
+Status: **T08 complete. AM-4 remediated and re-measured 2026-07-31.**
 Recorded: 2026-07-31. Amended 2026-07-31 — §4 gains measured savings per
 remediation option, and §5 corrects AM-12 from "uncomputable" to
 measured-at-session-level; see CB-WP-0002.
@@ -17,7 +17,8 @@ Machine: WSL2, Linux 6.18.33.2-microsoft-standard-WSL2, rustc 1.97.1,
 | Metric | Target | Measured | Verdict |
 |---|---|---|---|
 | AM-1 rule coverage | 100% of GR-rules | 58/58 (100%) | **met** |
-| AM-4 dependency weight | ≤20 crates | 33 | **NOT MET** |
+| AM-4a dep weight, shipped runtime | ≤250,000 third-party lines | 246,250 (23 crates) | **met** |
+| AM-4b dep weight, dev toolchain | ≤350,000 third-party lines | 317,021 (29 crates) | **met** |
 | AM-6 throughput | ≥100,000 events/s | 1,651,400 events/s | **met, 16.5×** |
 | AM-7 scaling | ≥0.9× at 20× workload | 1.08× | **met** |
 | AM-7 replay | 100k events ≤5s | 4.13 ms | **met, 1,210×** |
@@ -111,11 +112,44 @@ panics rather than measuring a stalled loop. The corrected figure is
   aggregate holds only ordered collections, so iteration order cannot
   vary between runs.
 
-## 4. AM-4 — not met, and why it is reported rather than fixed
+## 4. AM-4 — remediated and re-measured
 
-**33 transitive crates against a ≤20 target.** The baseline it was set
-against is boardgame.io's 120 npm packages, so we are 3.6× lighter, but
-the metric as written is missed and is recorded as missed.
+**Original result: NOT MET, 33 transitive crates against a ≤20 target.**
+Resolved by adopting both remediations (maintainer decision,
+2026-07-31): `serde_yaml` was made optional, and the metric was
+retargeted onto third-party source under audit.
+
+### Re-measurement (`make dep-weight`)
+
+| Configuration | Crates | Third-party LOC | Target | Verdict |
+|---|---|---|---|---|
+| Shipped runtime (`--no-default-features`) | 23 | 246,250 | ≤250,000 | **met** |
+| Dev toolchain (default features) | 29 | 317,021 | ≤350,000 | **met** |
+| Our own source | — | 3,408 | — | — |
+
+Scenario tooling costs **70,771 lines that a shipped game never
+compiles**. That split is the substantive result: the single number
+previously reported conflated a runtime concern with a test concern.
+
+**What actually changed in the build.** `cb-game-runtime` gained a
+`scenarios` feature carrying `serde_yaml`; the scenario module, the
+`ScenarioGame` impl and the string parsers behind it are `#[cfg]`-gated.
+Both configurations compile and lint clean under `-D warnings`.
+
+One trap worth recording: setting `default-features = false` on a
+*member* dependency is silently ignored when the workspace dependency
+does not specify it, so the first attempt gated nothing while appearing
+to work — `cargo tree` still showed all six YAML crates. The fix was
+setting `default-features = false` on the workspace dependency itself,
+with `cb-sim` opting into `scenarios` explicitly. This is exactly the
+class of error InnerLoop v1.0's positive-control rule targets: the build
+succeeded and the feature flag looked applied. It was caught by checking
+the dependency graph rather than trusting that the edit had worked.
+
+### Why the target moved, and why that is not moving the goalposts
+
+The ≤20 crate target was retired for two measured reasons, both
+recorded before the decision was taken:
 
 Attribution:
 
@@ -128,35 +162,24 @@ Attribution:
 | `rand_chacha` (K5 seeded RNG) | rand_chacha, rand_core, ppv-lite86, zerocopy | 4 |
 | Clay-Borg crates | cb-kernel, cb-events, cb-game-runtime, games-ground | 4 |
 
-The honest options, in order of preference:
+1. **It was unreachable without undoing the spec's own contracts.**
+   Measured ladder: `serde_yaml` optional −6 (→27), dropping
+   `serde_json` −4 (→23), inlining SHA-256 −8 (→19), inlining ChaCha12
+   −4 (→15). Nothing reaches 20 except reimplementing a primitive that
+   K5 or K7 requires — trading an audited implementation for a
+   scoreboard number.
+2. **Crate count does not compare across ecosystems.** Rust splits
+   crates far more finely than npm. The same granularity difference made
+   "33 vs 120 npm packages" flatter us *and* made ≤20 punish us.
 
-1. **Make `serde_yaml` optional** behind a `scenarios` feature. YAML is
-   a test-and-tooling concern; a shipped game runtime does not need it.
-   Removes 6 crates from the default build for no loss of capability
-   (`ryu` belongs to this group, not to serde_json, which uses `zmij`
-   for floats — corrected after measuring the reverse-dependency graph).
-   This is the one to do first, and it improves D4 optionality as well
-   as D2.
-2. **Revisit the target, and what it measures.** Measured savings per
-   option: serde_yaml optional −6 (→27); replacing serde_json −4 more
-   (→23); inlining SHA-256 −8 (→19); inlining ChaCha12 −4 (→15). **Only
-   reimplementing SHA-256 or ChaCha gets under 20**, so the target is
-   unreachable without undoing K5/K7.
+Third-party source under audit is what the count was proxying for, is
+comparable across ecosystems, and cannot be gamed by granularity. The
+new targets are set at roughly the current measurement plus headroom,
+so they bind on future growth rather than retroactively passing
+something that failed: adding another `serde_yaml`-sized dependency to
+the shipped runtime would breach AM-4a.
 
-   Crate count also compares badly across ecosystems: Rust splits
-   crates far more finely than npm, so "33 vs 120 npm packages" flatters
-   us. The measurable thing crate count proxies for is third-party
-   source under audit: **307,317 lines** across all five groups, against
-   3,398 of our own. Retargeting AM-4 on audited third-party LOC, split
-   into shipped-runtime and dev-toolchain, measures the real concern and
-   cannot be gamed by crate granularity.
-
-What we are **not** doing: hand-rolling SHA-256 or ChaCha to win a
-dependency count. That trades an auditable, well-tested primitive for a
-number on a scoreboard.
-
-Carried forward as an open decision (see the note at the head of this
-file): AM-4 is re-measured once the option is chosen.
+What we did **not** do: hand-roll SHA-256 or ChaCha to win a count.
 
 ## 5. Cost log (AM-12)
 

games/ground/Cargo.toml

@@ -7,9 +7,14 @@ license-file.workspace = true
 [dependencies]
 cb-kernel.workspace = true
 cb-events.workspace = true
-cb-game-runtime.workspace = true
+cb-game-runtime = { workspace = true, default-features = false }
 serde.workspace = true
 
+[features]
+default = ["scenarios"]
+# The ScenarioGame impl exists only when scenarios are compiled in.
+scenarios = ["cb-game-runtime/scenarios"]
+
 [dev-dependencies]
 criterion.workspace = true
 

games/ground/src/lib.rs

@@ -2,6 +2,7 @@
 //! GameKernel K15–K16). Every rule realized here names its GR-id in a doc
 //! comment, giving a greppable rule→code→scenario chain.
 
+#[cfg(feature = "scenarios")]
 use cb_game_runtime::{parse_actor, CommandStep, ScenarioGame, Setup};
 use cb_kernel::{Actor, Aggregate, ChaChaRng, KernelRng, PlayerId, Rejection, Seed};
 use serde::{Deserialize, Serialize};
@@ -235,6 +236,7 @@ impl GroundChoice {
         }
     }
 
+    #[cfg(feature = "scenarios")]
     fn parse(raw: &str, arg: Option<u64>) -> Result<Self, String> {
         let need = |what: &str| {
             arg.ok_or_else(|| format!("GROUND choice {raw:?} needs a {what} argument"))
@@ -275,6 +277,7 @@ pub enum SupportResponse {
 }
 
 impl SupportResponse {
+    #[cfg(feature = "scenarios")]
     fn parse(raw: &str) -> Result<Self, String> {
         match raw {
             "accept_bond" => Ok(SupportResponse::AcceptBond),
@@ -287,6 +290,7 @@ impl SupportResponse {
 }
 
 impl GroundMode {
+    #[cfg(feature = "scenarios")]
     fn parse(raw: &str) -> Result<Self, String> {
         match raw {
             "GR" => Ok(GroundMode::Gr),
@@ -329,6 +333,7 @@ pub enum Action {
 }
 
 impl Action {
+    #[cfg(feature = "scenarios")]
     fn parse(raw: &str) -> Result<Self, String> {
         match raw {
             "INVESTIGATE" => Ok(Action::Investigate),
@@ -1741,6 +1746,7 @@ impl GroundState {
 }
 
 /// GR-S01: hidden-Problem priorities admitted per player count.
+#[cfg(feature = "scenarios")]
 fn problem_priorities(players: u8) -> Result<u8, String> {
     match players {
         2 => Ok(2),
@@ -1752,6 +1758,7 @@ fn problem_priorities(players: u8) -> Result<u8, String> {
 
 /// GR-S04: the 24 core Solution cards, 6 per suit, in canonical order
 /// before the seeded shuffle.
+#[cfg(feature = "scenarios")]
 fn core_solution_deck() -> Vec<SolutionCard> {
     [Suit::Clarify, Suit::Repair, Suit::Boundary, Suit::Change]
         .into_iter()
@@ -1759,6 +1766,7 @@ fn core_solution_deck() -> Vec<SolutionCard> {
         .collect()
 }
 
+#[cfg(feature = "scenarios")]
 impl ScenarioGame for GroundState {
     /// GR-S01..S04. The `standard-Np` presets differ only in seat count;
     /// Problem content is scenario data, so the preset uses the canonical

specs/GameKernel.md

@@ -26,8 +26,16 @@ and must never leak types into anything specified here (M-D4-LEAK = 0).
 Dependency rule: `games/ground → cb-game-runtime → cb-events → cb-kernel`.
 No cycle, no skip that bypasses a public API. External crates allowed in
 the headless kernel workspace: serde (+format crate), a seedable RNG
-(e.g. chacha), a hash (sha2), thiserror-class error derive — target total
-transitive crates ≤ 20 (AM-4).
+(e.g. chacha), a hash (sha2), thiserror-class error derive. Weight is
+budgeted as **third-party source under audit**, split by build
+configuration — see AM-4.
+
+**Scenario parsing is dev-only.** `cb-game-runtime`'s `scenarios` feature
+carries the YAML dependency; a shipped game runtime builds with
+`--no-default-features` and parses no YAML. Workspace dependencies on
+`cb-game-runtime` and `games-ground` therefore set
+`default-features = false`, and consumers that need scenarios (currently
+`cb-sim`) opt in explicitly.
 
 ## 2. Canonical model
 
@@ -125,7 +133,23 @@ Command (actor-tagged intent)
 
 ---
 
-## 4. Acceptance metrics (the code loop's exit condition)
+## 4. Acceptance metrics
+
+**On AM-4's retarget (2026-07-31).** AM-4 originally read "≤20
+transitive crates", set against boardgame.io's 120 npm packages. That
+target was retired for two measured reasons. First, it was unreachable
+without undoing this spec's own contracts: K5 (seeded ChaCha) and K7
+(SHA-256) cost 12 crates between them, and the measured ladder showed
+nothing reached 20 except reimplementing one of those primitives —
+which trades an audited implementation for a scoreboard number. Second,
+crate count does not compare across ecosystems: Rust splits crates far
+more finely than npm, so the original 33-vs-120 comparison flattered us
+while the ≤20 target punished us, both for the same reason.
+
+Third-party source under audit is what the count was a proxy for, it is
+comparable across ecosystems, and it cannot be gamed by crate
+granularity. Splitting it by build configuration also makes the
+dev/shipped distinction visible, which the single number hid. (the code loop's exit condition)
 
 Per InnerLoop step 4/5: T08 iterates until every row meets its target;
 evidence lands in `evidence/CB-EV-0001-game-kernel.md` with no
@@ -136,7 +160,9 @@ evidence lands in `evidence/CB-EV-0001-game-kernel.md` with no
 | AM-1 | M-D1-COV: GR-rules covered by ≥1 passing scenario | no candidate has any (observation) | **100%** of GR + U rules | measured by runner report |
 | AM-2 | M-D1-SPL: spec lines per rule in `games/ground` rules code (impl LOC ÷ rule count) | boardgame.io ~36 LOC for the 2-move synthetic game | ≤ 40 LOC/rule, paired with AM-1 (anti-gaming pair) | measured (tokei + rule count) |
 | AM-3 | Synthetic-workload definition size: LOC to express the CB-RES-0001 synthetic game on our kernel | ~36 LOC (boardgame.io, measured) | ≤ 50 LOC | measured |
-| AM-4 | M-D2-DEP: transitive crates, headless workspace | 120 npm packages | **≤ 20** | measured (cargo tree) |
+| AM-4a | M-D2-DEP: third-party LOC, **shipped runtime** (`--no-default-features`) | boardgame.io: 120 npm packages / 3.9M LOC | **≤ 250,000 lines** | measured (`make dep-weight`) |
+| AM-4b | M-D2-DEP: third-party LOC, **dev toolchain** (default features) | as above | **≤ 350,000 lines** | measured (`make dep-weight`) |
+| AM-4c | M-D2-DEP: own source per third-party 100k lines | — | reported, not targeted | measured (`make dep-weight`) |
 | AM-5 | M-D2-BLD: clean release build of headless workspace | n/a (npm install ~seconds; not comparable) | ≤ 60 s on bnt-lap001, recorded not gated | measured |
 | AM-6 | M-D3-THR: applied events/s, synthetic workload, same machine | boardgame.io ~1,100–1,900 moves/s (best config, degrading) | **≥ 100,000/s** (stipulated target, ADR-0002) | measured |
 | AM-7 | M-D3 scaling: throughput @100k events vs @5k; and snapshot+replay of 100k events | boardgame.io 0.45–0.66× @20–40k, DNF @100k | **≥ 0.9×** (flat), replay of 100k events ≤ 5 s, hash-identical | measured |

tools/cb-sim/Cargo.toml

@@ -5,8 +5,8 @@ version.workspace = true
 license-file.workspace = true
 
 [dependencies]
-cb-game-runtime.workspace = true
-games-ground.workspace = true
+cb-game-runtime = { workspace = true, features = ["scenarios"] }
+games-ground = { workspace = true, features = ["scenarios"] }
 
 [lints]
 workspace = true

tools/dep-weight.py

@@ -0,0 +1,138 @@
+#!/usr/bin/env python3
+"""AM-4: third-party dependency weight, measured as source under audit.
+
+Crate count is a poor cross-ecosystem proxy — Rust splits crates far more
+finely than npm, so "33 crates vs 120 npm packages" flatters us in one
+direction and a low crate-count target punishes us in the other. What the
+count stands in for is how much third-party source a reviewer would have
+to audit. This measures that directly, in two configurations:
+
+  shipped-runtime  cargo build --no-default-features  (what a game ships)
+  dev-toolchain    cargo build                        (adds scenario YAML)
+
+Positive control (InnerLoop v1.0 §Step 5): every crate in the dependency
+graph must be located on disk and produce a non-zero line count. A crate
+that cannot be found is reported and the run exits non-zero rather than
+silently under-reporting the total — under-reporting is the exact
+direction this metric could be gamed.
+
+Usage: python3 tools/dep-weight.py [--json]
+"""
+
+import glob
+import json
+import os
+import shutil
+import subprocess
+import sys
+
+PACKAGE = "games-ground"
+CONFIGS = {
+    "shipped-runtime": ["--no-default-features"],
+    "dev-toolchain": [],
+}
+
+
+def crates(extra_args):
+    """Third-party crates in the normal (non-dev) dependency graph."""
+    if not shutil.which("cargo"):
+        print(
+            "ERROR: cargo not on PATH. Try: export PATH=\"$HOME/.cargo/bin:$PATH\"",
+            file=sys.stderr,
+        )
+        sys.exit(1)
+    out = subprocess.run(
+        ["cargo", "tree", "-p", PACKAGE, "--edges", "normal", "--prefix", "none"]
+        + extra_args,
+        capture_output=True,
+        text=True,
+        check=True,
+    ).stdout
+    found = {}
+    for line in out.splitlines():
+        parts = line.split()
+        if len(parts) < 2 or not parts[1].startswith("v"):
+            continue
+        name, version = parts[0], parts[1].lstrip("v")
+        # Path dependencies are our own code, not third-party.
+        if "(/" in line:
+            continue
+        found[name] = version
+    return found
+
+
+def source_lines(name, version):
+    """Lines of Rust in the vendored source for one crate."""
+    roots = glob.glob(os.path.expanduser("~/.cargo/registry/src/*/"))
+    for root in roots:
+        # Version may carry a build suffix (e.g. 0.9.34+deprecated).
+        for d in glob.glob(f"{root}{name}-{version}*/") + glob.glob(f"{root}{name}-*/"):
+            total = 0
+            for dirpath, _, files in os.walk(d):
+                for f in files:
+                    if f.endswith(".rs"):
+                        try:
+                            with open(os.path.join(dirpath, f), "rb") as fh:
+                                total += fh.read().count(b"\n")
+                        except OSError:
+                            pass
+            if total:
+                return total
+    return 0
+
+
+def main():
+    report = {}
+    missing = []
+    for label, args in CONFIGS.items():
+        found = crates(args)
+        per_crate = {}
+        for name, version in sorted(found.items()):
+            lines = source_lines(name, version)
+            if lines == 0:
+                missing.append(f"{name} {version} ({label})")
+            per_crate[name] = lines
+        report[label] = {
+            "crates": len(found),
+            "third_party_loc": sum(per_crate.values()),
+            "per_crate": per_crate,
+        }
+
+    own = 0
+    for base in ("crates", "games", "tools"):
+        for dirpath, _, files in os.walk(base):
+            if "target" in dirpath.split(os.sep):
+                continue
+            for f in files:
+                if f.endswith(".rs"):
+                    with open(os.path.join(dirpath, f), "rb") as fh:
+                        own += fh.read().count(b"\n")
+    report["own_loc"] = own
+
+    if "--json" in sys.argv:
+        print(json.dumps(report, indent=2))
+    else:
+        print("AM-4 dependency weight")
+        print(f"  own source                        {own:>9,} lines")
+        for label in CONFIGS:
+            r = report[label]
+            print(
+                f"  {label:<18}{r['crates']:>3} crates  "
+                f"{r['third_party_loc']:>9,} lines third-party"
+            )
+        delta = (
+            report["dev-toolchain"]["third_party_loc"]
+            - report["shipped-runtime"]["third_party_loc"]
+        )
+        print(f"  scenario tooling costs            {delta:>9,} lines (dev only)")
+
+    if missing:
+        # Positive control: a crate we could not measure would silently
+        # shrink the total, so refuse to report rather than under-report.
+        print("\nERROR — source not found for:", ", ".join(missing), file=sys.stderr)
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

workplans/CB-WP-0002-cost-accounting.md

@@ -2,6 +2,7 @@
 id: CB-WP-0002
 title: "Make agentic cost measurable, so D2 claims are falsifiable"
 status: proposed
+state_hub_workstream_id: "b7c22f69-fbe9-48df-9619-007db79ae338"
 ---
 
 # Purpose
@@ -45,6 +46,7 @@ positive control.
 id: CB-WP-0002-T01
 status: todo
 priority: high
+state_hub_task_id: "2694c2c1-0070-4d8e-b4fc-196b582b36d5"
 ```
 
 Produce `research/CB-RES-0002-cost-accounting.md` per the InnerLoop
@@ -67,6 +69,7 @@ accuracy and the hub to lead on durability.
 id: CB-WP-0002-T02
 status: todo
 priority: high
+state_hub_task_id: "eae248ab-f29f-4f11-9d20-e8145b0d822d"
 ```
 
 Adversarial review of T01 first (InnerLoop §Step 2), committed as
@@ -92,6 +95,7 @@ Gate: no collector code before this ADR is committed.
 id: CB-WP-0002-T03
 status: todo
 priority: high
+state_hub_task_id: "00d42ed2-4391-4580-aae2-06e3e151c69b"
 ```
 
 Write `specs/CostAccounting.md`: the cost model (input, output, cache
@@ -114,6 +118,7 @@ replace AM-12's definition with one that is computable.
 id: CB-WP-0002-T04
 status: todo
 priority: medium
+state_hub_task_id: "9eb8329b-5f41-477b-8cf3-2cda5ba8dbe8"
 ```
 
 Implement the tool chosen in T02 (expected: `tools/cb-cost`). It reads
@@ -137,6 +142,7 @@ each message at its own model's rate.
 id: CB-WP-0002-T05
 status: todo
 priority: medium
+state_hub_task_id: "bea4cc0a-e4d0-4077-9dc7-df7726a48f86"
 ```
 
 Run the collector over the CB-WP-0001 session and commit
@@ -160,6 +166,7 @@ cleared the bar that CB-WP-0001's AM-12 failed to clear.
 id: CB-WP-0002-T06
 status: todo
 priority: low
+state_hub_task_id: "1412263b-70c1-43e4-957d-1ad6c3203ca9"
 ```
 
 Make cost collection automatic rather than remembered: add the
@@ -174,6 +181,7 @@ the one command surface.
 id: CB-WP-0002-T07
 status: todo
 priority: low
+state_hub_task_id: "ebe58d91-be5f-4d5b-ba40-b03275b4eefc"
 ```
 
 Revise `specs/InnerLoop.md` and `specs/MetricsAndScenarios.md` from what