diff --git a/crates/aura-cli/src/main.rs b/crates/aura-cli/src/main.rs
index 844b083..ab799bb 100644
--- a/crates/aura-cli/src/main.rs
+++ b/crates/aura-cli/src/main.rs
@@ -1120,15 +1120,19 @@ with `aura graph build < {path}`, then exec the result"
         // a process document) names the found kind and exec's two
         // executable classes, instead of the campaign leg's generic
         // "kind" key must be "campaign" (which never says WHAT was found or
-        // what exec accepts at all). Same exit-code class as today's
-        // fall-through refusal (runtime-class, 1 — mirrors
-        // `exit_on_campaign_result`'s `Err` arm).
+        // what exec accepts at all). Exit 2, not 1 (#342 item 5, C14
+        // realignment): the target is a real, existing, valid-JSON file, so
+        // its content is itself part of the argument (C14's usage-class
+        // rule) — the same class as the sibling OpScript and
+        // not-valid-JSON file-content faults right below/above, not the
+        // runtime class reserved for a target that resolves to no real
+        // state at all (a missing file or an unregistered content id).
         (Some(path), Some(ExecFileShape::WrongKind(found))) => {
             eprintln!(
                 "aura: exec: {path}: this document's kind is \"{found}\", but exec executes \
 only a campaign document or a fully-bound blueprint"
             );
-            std::process::exit(1);
+            std::process::exit(2);
         }
         (Some(path), Some(ExecFileShape::Blueprint)) => {
             exec_blueprint_leg(path, &a.r#override, &a.tap, env)
diff --git a/crates/aura-cli/tests/exec.rs b/crates/aura-cli/tests/exec.rs
index 1a30820..5fe8e48 100644
--- a/crates/aura-cli/tests/exec.rs
+++ b/crates/aura-cli/tests/exec.rs
@@ -285,17 +285,24 @@ fn exec_op_script_file_refuses_with_build_hint_not_invalid_json() {
     );
 }
 
-/// #342 item 4: a kind-bearing document that is not a campaign (here, a
-/// process document) refuses naming the found kind and exec's two
+/// #342 item 4/item 5: a kind-bearing document that is not a campaign (here,
+/// a process document) refuses naming the found kind and exec's two
 /// executable classes, instead of the campaign leg's generic "the \"kind\"
 /// key must be \"campaign\"" — which never says WHAT was found, nor what
-/// exec accepts at all.
+/// exec accepts at all. Exit 2, not 1 (C14 exit-partition realignment,
+/// #342 item 5): the target IS a real, existing, valid-JSON file, so its
+/// content is itself part of the argument (C14's usage-class rule) — the
+/// same class as the op-script and not-valid-JSON file-content faults
+/// (`exec_op_script_file_refuses_with_build_hint_not_invalid_json`,
+/// `exec_malformed_json_file_refuses_neutrally_not_misrouted`), not the
+/// runtime class reserved for a target that resolves to no real state at
+/// all (missing file / unregistered content id).
 #[test]
 fn exec_process_document_names_found_kind_and_executable_classes() {
     let dir = temp_cwd("exec-wrong-kind-process");
     write_doc(&dir, "p.process.json", SWEEP_ONLY_PROCESS_DOC);
     let (out, code) = run_code_in(&dir, &["exec", "p.process.json"]);
-    assert_eq!(code, Some(1), "stdout/stderr: {out}");
+    assert_eq!(code, Some(2), "stdout/stderr: {out}");
     assert!(out.contains("\"process\""), "must name the found kind: {out}");
     assert!(
         out.contains("campaign document") && out.contains("fully-bound blueprint"),
@@ -546,6 +553,54 @@ fn exec_blueprint_without_override_runs_bound_values_untouched() {
     );
 }
 
+/// Ratification pin (#343): an override IS a topology-parameter variation,
+/// even a "no-op" one that re-binds a param to its EXISTING bound value —
+/// `examples/r_sma.json` already binds `fast.length` to 2, so
+/// `--override fast.length=2` changes nothing observable about the run's
+/// *behaviour*, yet the reopened param moves from `manifest.defaults` to
+/// `manifest.params` (the #246 reopen mechanism, unconditionally applied),
+/// which changes the canonical bytes `topology_hash` covers: the two runs'
+/// `topology_hash`es must therefore DIFFER, and the overridden run's own
+/// hash must be stable across repeated runs (determinism, C1) — the
+/// reopened topology is its own honest, reproducible identity, not a
+/// dangling reference (see the ratification prose in C12/C24).
+#[test]
+fn exec_blueprint_noop_override_mints_a_distinct_but_stable_topology_hash() {
+    let (base_out, base_code) = run_code(&["exec", "examples/r_sma.json"]);
+    assert_eq!(base_code, Some(0), "stdout/stderr: {base_out}");
+    let base_line = base_out.lines().find(|l| l.starts_with('{')).expect("record line");
+    let base_v: serde_json::Value = serde_json::from_str(base_line).expect("record parses");
+    let base_hash =
+        base_v["manifest"]["topology_hash"].as_str().expect("base topology_hash").to_string();
+
+    let (ov_out, ov_code) =
+        run_code(&["exec", "examples/r_sma.json", "--override", "fast.length=2"]);
+    assert_eq!(ov_code, Some(0), "stdout/stderr: {ov_out}");
+    let ov_line = ov_out.lines().find(|l| l.starts_with('{')).expect("record line");
+    let ov_v: serde_json::Value = serde_json::from_str(ov_line).expect("record parses");
+    let ov_hash =
+        ov_v["manifest"]["topology_hash"].as_str().expect("overridden topology_hash").to_string();
+
+    assert_ne!(
+        base_hash, ov_hash,
+        "a no-op override still reopens the bound param, minting the reopened topology's own \
+hash: base {base_out} / overridden {ov_out}"
+    );
+
+    let (ov_out_2, ov_code_2) =
+        run_code(&["exec", "examples/r_sma.json", "--override", "fast.length=2"]);
+    assert_eq!(ov_code_2, Some(0), "stdout/stderr: {ov_out_2}");
+    let ov_line_2 = ov_out_2.lines().find(|l| l.starts_with('{')).expect("record line");
+    let ov_v_2: serde_json::Value = serde_json::from_str(ov_line_2).expect("record parses");
+    let ov_hash_2 =
+        ov_v_2["manifest"]["topology_hash"].as_str().expect("overridden topology_hash (2)");
+    assert_eq!(
+        ov_hash, ov_hash_2,
+        "the overridden run's topology_hash is stable across repeated runs (determinism, C1): \
+{ov_out} / {ov_out_2}"
+    );
+}
+
 /// A malformed override token (no `NODE.PARAM=VALUE` shape) refuses as usage.
 #[test]
 fn exec_override_malformed_token_refuses_with_usage() {
@@ -1523,6 +1578,26 @@ fn exec_json_suffixed_nonexistent_target_is_not_read_as_a_blueprint() {
     );
 }
 
+/// A target that IS a well-formed 64-hex content id, but names no
+/// registered campaign, refuses at runtime (exit 1, C14 — #342 item 5): no
+/// file is ever read for a bare id target, so there is no argument
+/// *content* to have gotten wrong (contrast the wrong-kind / op-script /
+/// not-valid-JSON FILE-content faults above, all exit 2) — only recorded
+/// state (a registered campaign under this id) that turns out to be
+/// absent, the same runtime class as the missing-file / stray-token cases
+/// immediately above.
+#[test]
+fn exec_well_formed_but_unregistered_content_id_refuses_at_runtime() {
+    let (dir, _fixture) = fresh_project();
+    let unregistered = "a".repeat(64);
+    let (out, code) = run_code_in(&dir, &["exec", &unregistered]);
+    assert_eq!(code, Some(1), "stdout/stderr: {out}");
+    assert!(
+        out.contains(&format!("no campaign {unregistered} in the project store")),
+        "stdout/stderr: {out}"
+    );
+}
+
 /// The usage/runtime exit-code partition (#175 iteration 2, deviation #8),
 /// ported onto exec's own grammar (mirrors
 /// `cli_run.rs::exit_codes_partition_usage_two_from_runtime_one`, whose
diff --git a/docs/authoring-guide.md b/docs/authoring-guide.md
index a36f998..d4916de 100644
--- a/docs/authoring-guide.md
+++ b/docs/authoring-guide.md
@@ -361,6 +361,60 @@ at all — the same closed-args-then-bind order every arg-bearing type follows
 introspect --params` as `combo.weights[1]:F64` (alongside
 `combo.weights[0]:F64 default=0.7`).
 
+### Worked example: wiring a cost model (`ConstantCost` → `CostSum`)
+
+`CostSum`'s `cost[k].<field>` inputs (C10) are meaningless fed from a bare
+source: they read the co-temporal record a real `PositionManagement` node
+emits (`closed`, `open`, `entry_price`, `stop_price`). Every node in that
+chain — `Bias`, `FixedStop`, `Sizer`, `PositionManagement`, `ConstantCost`,
+`CostSum` — sits in the closed vocabulary, so the whole cost-model wiring is
+honestly expressible by hand, one `add`/`connect` pair at a time, mirroring
+the Rust `risk_executor` + `cost_graph` composite-builders (`aura-composites`)
+field-for-field:
+
+```json
+[
+  {"op": "source", "role": "price", "kind": "F64"},
+  {"op": "source", "role": "signal", "kind": "F64"},
+  {"op": "add", "type": "Bias", "name": "bias", "bind": {"scale": {"F64": 1.0}}},
+  {"op": "feed", "role": "signal", "into": ["bias.signal"]},
+  {"op": "add", "type": "FixedStop", "name": "stop", "bind": {"distance": {"F64": 0.01}}},
+  {"op": "add", "type": "PositionManagement", "name": "pm"},
+  {"op": "feed", "role": "price", "into": ["stop.price", "pm.price"]},
+  {"op": "add", "type": "Sizer", "name": "sizer", "bind": {"risk_budget": {"F64": 1.0}}},
+  {"op": "connect", "from": "bias.bias", "to": "sizer.bias"},
+  {"op": "connect", "from": "stop.stop_distance", "to": "sizer.stop_distance"},
+  {"op": "connect", "from": "bias.bias", "to": "pm.bias"},
+  {"op": "connect", "from": "stop.stop_distance", "to": "pm.stop_distance"},
+  {"op": "connect", "from": "sizer.size", "to": "pm.size"},
+  {"op": "add", "type": "ConstantCost", "name": "cc", "bind": {"cost_per_trade": {"F64": 0.5}}},
+  {"op": "connect", "from": "pm.closed_this_cycle", "to": "cc.closed"},
+  {"op": "connect", "from": "pm.open", "to": "cc.open"},
+  {"op": "connect", "from": "pm.entry_price", "to": "cc.entry_price"},
+  {"op": "connect", "from": "pm.stop_price", "to": "cc.stop_price"},
+  {"op": "add", "type": "CostSum", "name": "costsum", "args": {"n_costs": "1"}},
+  {"op": "connect", "from": "cc.cost_in_r", "to": "costsum.cost[0].cost_in_r"},
+  {"op": "connect", "from": "cc.cum_cost_in_r", "to": "costsum.cost[0].cum_cost_in_r"},
+  {"op": "connect", "from": "cc.open_cost_in_r", "to": "costsum.cost[0].open_cost_in_r"},
+  {"op": "expose", "from": "pm.realized_r", "as": "realized_r"},
+  {"op": "expose", "from": "costsum.cost_in_r", "as": "cost_in_r"}
+]
+```
+
+`CostSum`'s port names ARE the `cost[k].<field>` shape already
+(`cost[0].cost_in_r`, …) — `cost_port` is baked into `CostSum::make`'s schema
+itself (#271), no composite-level renaming needed; a second factor is
+`args: {"n_costs": "2"}` plus a second cost-node block wired into
+`cost[1].*`, and `CostSum` per-field-sums whatever arity it was given (#341
+item 4). This closes the "CostSum reachable but pathless" gap: the ports
+genuinely connect at the op-script level, using only closed-vocabulary
+nodes. It is a standalone wiring reference, though, not the production
+attachment path — a campaign strategy's real cost model still comes from
+the campaign document's `cost:` block (C10, `cost_nodes_for`), wrapped
+around the user's bias-only blueprint entirely in Rust at run time; a
+user's op-script-authored blueprint never embeds `PositionManagement` /
+cost nodes itself.
+
 ### Session anchoring: the `SessionFrankfurt` preset
 
 To anchor logic to the trading session, the closed vocabulary ships a
diff --git a/docs/design/contracts/c12-atomic-sim-unit.md b/docs/design/contracts/c12-atomic-sim-unit.md
index af0505d..76a6eca 100644
--- a/docs/design/contracts/c12-atomic-sim-unit.md
+++ b/docs/design/contracts/c12-atomic-sim-unit.md
@@ -10,8 +10,11 @@ param — the family boundary re-opens it on the probe and on every member
 reload, and the axis binds it per cell; `exec`'s blueprint leg still requires
 every param resolved (a truly open param refuses), and its own `--override
 NODE.PARAM=VALUE` (#246 residue, #319) reopens exactly the named bound param
-for that one execution — the single-member analogue of a campaign axis.
-Identity is untouched: `content_id_of` (`crates/aura-research/src/lib.rs`) is
+for that one execution — the single-member analogue of a campaign axis. The
+reopened execution's `topology_hash` is therefore the reopened topology's own,
+not the pre-override document's — ratified as the deliberate reading, not a
+defect (#343; full ratification in [C24](c24-blueprint-data.md)'s
+"Reproduction identity"). Identity is untouched: `content_id_of` (`crates/aura-research/src/lib.rs`) is
 the one hashing primitive, read directly off the authored document by
 `aura_runner::member`'s `run_signal_r`/`run_blueprint_member` — where the
 manifest's `topology_hash` is computed inline (#319 Task 9 retired the
diff --git a/docs/design/contracts/c14-headless-two-faces.md b/docs/design/contracts/c14-headless-two-faces.md
index 232dae0..7c2a042 100644
--- a/docs/design/contracts/c14-headless-two-faces.md
+++ b/docs/design/contracts/c14-headless-two-faces.md
@@ -75,6 +75,28 @@ The machine-first help surface (JSON/manifest help, stdin op-scripts) is
 deferred to the #157 / [C21](c21-world.md) track, distinct from this
 human/GNU-convention compliance.
 
+**`exec`'s unresolved-target exit partition is pinned (#342 item 5).** A
+target fault splits along the same usage/runtime line the exit-code partition
+above already draws, keyed on whether a *real, existing document's content*
+is being judged (usage, exit 2 — the content of an argv-named file is itself
+part of the argument) or the target simply fails to resolve to any recorded
+state at all (runtime, exit 1 — the needed environment/recorded state is
+missing). Missing-state faults (exit 1): a target naming no readable file and
+no plausible content id (`'{target}' is neither a readable .json file nor a
+64-hex content id`), and a well-formed-but-unregistered 64-hex content id
+(`no campaign {id} in the project store`) — no file or store entry exists to
+have content in either case. File-content faults (exit 2): a file that does
+not parse as JSON at all, a valid-JSON op-script array (not a document exec
+can execute at all — it names the `graph build` escalation instead), and a
+kind-bearing document whose `"kind"` is not `"campaign"` (e.g. a process
+document handed to `exec`) — all three are a real, readable file whose
+content is the fault. The wrong-kind case is the one realignment this pin
+made (#342 item 5): it shipped at exit 1 (mirroring the campaign leg's own
+missing-state refusals) until this pass, despite being a file-content fault
+like its op-script and not-valid-JSON siblings, not a missing-state fault
+like the file-vs-id cases — realigned to exit 2 to match its true class, the
+one sanctioned behaviour change of this pin.
+
 **Two artifact classes, two redundancy budgets** (#249, ratified 2026-07-13).
 The data layer the programmatic face emits is a public interface read raw (by
 humans and LLMs), and its records split into two classes with opposite
diff --git a/docs/design/contracts/c18-registry.md b/docs/design/contracts/c18-registry.md
index 81af12b..cf698c9 100644
--- a/docs/design/contracts/c18-registry.md
+++ b/docs/design/contracts/c18-registry.md
@@ -147,7 +147,13 @@ entry); name coincidence against one of the two namespaces IS the mechanism, and
 the referenced blueprint is the single source of truth for which namespace a name
 falls in. Pinned by
 `referential_tier_accepts_a_kind_correct_axis_over_a_bound_param`
-(`aura-registry/src/lib.rs`).
+(`aura-registry/src/lib.rs`). The single-run analogue — `exec`'s own
+`--override NODE.PARAM=VALUE` reopening a bound param for one execution — has
+the identical hash consequence, ratified rather than fixed (#343): the
+executed topology's `topology_hash` is the reopened topology's own, not the
+referenced document's, exactly as a reopened campaign member's has always
+been ([C24](c24-blueprint-data.md)'s "Reproduction identity" carries the full
+ratification).
 
 **The campaign executor.** `aura exec <file|content-id>` (#319) executes a
 campaign (a file is register-then-run sugar; the content id is canonical): a
diff --git a/docs/design/contracts/c24-blueprint-data.md b/docs/design/contracts/c24-blueprint-data.md
index 32b525e..c0a5c21 100644
--- a/docs/design/contracts/c24-blueprint-data.md
+++ b/docs/design/contracts/c24-blueprint-data.md
@@ -119,6 +119,25 @@ itself blueprint-data. The **identity id** (#171) is an additive sibling:
 --identity-id`. The byte-exact content id keeps the store/reproduce roles; the
 identity id is introspection-only until a dedup consumer exists.
 
+**The override-reopened hash is ratified, not a defect (#343).** `exec`'s
+`--override NODE.PARAM=VALUE` (above) reopens a bound param before bootstrap, so
+the executed signal's canonical bytes — and therefore its `topology_hash` — are
+the **reopened topology's own**, which may correspond to no blueprint ever
+`put_blueprint`-stored, even for a "no-op" override that re-binds a param to its
+existing bound value (the bound value still moves from `defaults` to `params`,
+#249, changing the canonical bytes `topology_hash` covers). This is deliberate,
+not accidental: an override **is** a topology-parameter variation, exactly as
+the campaign leg's #246 axis-over-bound-param path has always minted the
+reopened member's hash, never the referenced document's ([C18](c18-registry.md)'s
+bound-override coincidence) — stamping the pre-override document's stored hash
+on the single-run leg instead would make the two reopen mechanisms disagree
+about what identity means for the same mechanism. Reproduction identity survives
+regardless: the manifest's `params` map plus the base document deterministically
+reconstruct the executed variant, byte-identically. An unresolved
+`topology_hash` is the honest name of a real, reconstructible topology, not a
+dangling reference — store-resolution (`get_blueprint`) is a lookup
+convenience, never an identity guarantee.
+
 ### Axis discovery
 
 `aura graph introspect --params <blueprint.json|id>` (#328) is the one