feat(governor): Lane H PR-3b — LocalSubstrateGovernor reference impl + arc_swap publish#1354
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…+ arc_swap publish Stacks on #1352 (codex's PR-3a policy_selector, MERGED). Per GENOME-FOUNDRY-SENTINEL #1327 Part 11. LocalSubstrateGovernor is the reference impl of the SubstrateGovernor trait (from #1345 PR-1). Holds the live policy behind arc_swap for wait-free reads; mutex-protected snapshot history for telemetry. What ships in src/workers/continuum-core/src/governor/local.rs: - LocalSubstrateGovernor struct: Arc<ArcSwap<GovernorPolicy>> for policy + Mutex<SnapshotState> for cascade-transition-count + recent-signals ring - new(initial_policy) constructor — ready to serve current_policy() immediately - set_candidates(Vec<PolicyFile>) — file watcher (PR-3d) will call this on fs change events; for PR-3b, set manually - try_hardware_detected(hw) → Result<(), PolicySelectionError> — fallible variant for callers that want the typed error - on_hardware_detected(hw) — trait method, swallows errors per spec (logs/telemetry surface them separately) - on_pressure_signal(signal) — records into ring (PR-3c adds threshold + cascade logic; PR-3b only records) - snapshot() → GovernorSnapshot — telemetry consumer reads this - candidate_count() — diagnostic for 'did the file watcher load anything?' Concurrency model (matches spec's 'never blocks reads'): - Reads: arc_swap.load_full() → Arc<GovernorPolicy> clone (wait-free) - Writes: arc_swap.store(Arc::new(new_policy)) + mutex on snapshot state for transition-count bump (~µs hold) - Tests prove the wait-free guarantee: many_concurrent_reads_dont_block + concurrent_read_during_write_sees_consistent_snapshot What this PR DOES NOT do: - Cascade state machine + threshold/hysteresis (PR-3c) - File watcher / hot reload (PR-3d) - PressureBroker subscription wiring (PR-4) - Built-in default policy fallback (caller handles NoMatchingPolicy) Failure-mode discipline: - on_hardware_detected with no matching candidate KEEPS previous policy (trait swallows error per spec — operator monitors via snapshot.cascade_transition_count which stays unchanged on Err) - on_hardware_detected with empty candidates is a no-op (first-boot before file watcher loads anything — governor still serves initial_policy) - cascade_transition_count increments per PUBLISH, not per call — failed selections don't count - on_pressure_signal does NOT bump cascade_transition_count in PR-3b (test pins this so PR-3c lands the threshold logic together) Tests: 16 passing on cargo test --lib --features metal,accelerate governor::local:: (79 total governor:: across PR-1/PR-2/PR-3a/PR-3b) - new() serves initial policy immediately - candidate_count reflects set_candidates - on_hardware_detected publishes matching policy - try_hardware_detected returns NoMatchingPolicy err - on_hardware_detected no-match KEEPS previous policy - on_hardware_detected empty candidates no-op - Successive hardware_detected publishes multiple times - on_pressure_signal records signal - recent_signals ring capped at RECENT_SIGNALS_CAPACITY=32 (FIFO eviction) - snapshot includes policy + signals - cascade_transition_count increments per publish - cascade_transition_count UNCHANGED on no-match - on_pressure_signal does NOT transition in PR-3b (PR-3c adds it) - many_concurrent_reads_dont_block (Arc<Self> + 16 threads × 1000 reads each) - concurrent_read_during_write_sees_consistent_snapshot (writer mutates + reader observes Arc snapshots that are always one of {1, 2, 8} — no torn read) - current_policy returns same Arc when no writes (Arc::ptr_eq) Added deps: arc-swap = '1.7' (tiny crate, no transitive deps). Coordination: ceded my own PR-3a (#1351 closed) in favor of codex's #1352 which has stricter AmbiguousPolicy refusal + hardware_fingerprint diagnostic surface. This PR-3b rebased onto codex's policy_selector API (arg order: select_policy(policies, hw), not (hw, policies)) + imports updated. Stack: - #1335 hw_probe (MERGED) - #1345 PR-1 governor-types (MERGED) - #1350 PR-2 TOML loader (MERGED) - #1352 PR-3a policy_selector (codex's, MERGED) - This PR (PR-3b): LocalSubstrateGovernor + arc_swap publish - Future PR-3c: cascade state machine + hysteresis (5 steps; restore- speculation-one-step-later anti-oscillation rule per spec) - Future PR-3d: file watcher (notify crate) - Future PR-4: PressureBroker → governor wiring VDD evidence N/A — pure-state impl. Evidence with PR-3c when the cascade is wired + with PR-4 when actual pressure signals flow.
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Stacks on canary post-#1360 merge. PR-3c2 wired cascade evaluator into on_pressure_signal to update cascade_step. This PR-3c3 ships apply_cascade_step_to_policy — the pure function that ACTUALLY transforms tier_sizes/cadence/concurrency/ speculation/federation/consolidation per the cascade step. Per spec §'Adjustment Cascade' table: - Step 0: unchanged (normal operation) - Step 1: speculation_aggressiveness drops one notch toward Off (Aggressive → Balanced → Conservative → Off → Off) - Step 2: cumulative + personas_concurrent -= 1 (floor 1) + defer non-realtime (cadence_multipliers.delayed/.background = max(current, 2.0)) - Step 3: cumulative + tier_sizes.l1_lora_layers + l1_kv_tokens shrunk to 75% (floor 1) - Step 4: cumulative + federation_pull_cadence.pull_cadence_seconds = MAX_FEDERATION_PULL_CADENCE_SECONDS (3600s = once-per-hour) - Step 5: cumulative + consolidation_schedule = Manual (operator must explicitly trigger; substrate stops on its own under max pressure) Transformations are CUMULATIVE — step N includes all transformations from steps 1..N. Caller passes BASE policy (cascade_step=0) and step; function returns a NEW policy with cascade_step + transformations applied. Caller is responsible for bumping policy_version + updating committed_at_ms at publish time. Pure function — no I/O, no state, no globals. Deterministic. Anti-oscillation note (caller responsibility, documented in fn docstring): the spec's 'restore-speculation-one-step-later' rule lives in the WIRING layer (LocalSubstrateGovernor follow-up), not this pure transformation. When retreating N → N-1, caller applies step N-1 for everything EXCEPT speculation, which uses step N for one more cycle. This separation keeps apply_cascade_step_to_policy a clean deterministic mapping. Also documented (test pins this): apply_cascade_step_to_policy is NOT reversible from a transformed policy. apply(transformed, 0) does NOT restore base — the caller must hold the original base separately and re-apply step 0 from it. LocalSubstrateGovernor will need to evolve to store base + active separately (PR-3c4). Constants: - MAX_FEDERATION_PULL_CADENCE_SECONDS = 3600 (once-per-hour ceiling) Pinned by test to catch silent tuning. Tests: 46 passing on cargo test --lib --features metal,accelerate governor::cascade:: (30 from PR-3c1 + 16 new) NEW (16) for apply_cascade_step_to_policy: - step 0 == base except cascade_step (identity) - step 1 drops Aggressive → Balanced - step 1 covers full speculation ladder (4 variants) - step 2 personas-1 + cumulative speculation drop - step 2 personas floor at 1 (defensive) - step 2 stretches non-realtime cadence (delayed + background → 2.0) - step 2 doesn't shrink already-stretched cadence (max-not-set semantics) - step 3 shrinks l1 by 25% (8→6, 16384→12288) - step 3 l1 floors at 1 (1*0.75=0.75→0→max(0,1)=1) - step 4 federation_pull_cadence_seconds = MAX (60→3600) - step 5 consolidation = Manual - step 5 cumulative — all prior transformations applied - step > MAX clamps to MAX (defensive against caller bugs) - determinism - not reversible from transformed (documented limitation, test pinned) - MAX_FEDERATION_PULL_CADENCE_SECONDS const pinned Stack: - #1345 PR-1 governor-types (MERGED) - #1350 PR-2 TOML loader (MERGED) - #1352 PR-3a policy_selector (MERGED) - #1354 PR-3b LocalSubstrateGovernor (MERGED) - #1356 PR-3c1 cascade evaluator (MERGED) - #1360 PR-3c2 cascade wiring + time-in-step gate (MERGED) - This PR (PR-3c3): apply_cascade_step_to_policy field rewrites - Future PR-3c4: wire apply_cascade_step_to_policy into LocalSubstrateGovernor + restore-speculation-one-step-later semantics + base-vs-active policy split - Future PR-3d: file watcher (notify crate) - Future PR-4: PressureBroker → governor wiring VDD evidence N/A — pure transformation. Evidence with PR-3c4 wiring + PR-4 + downstream consumers reading the throttled policy. Coordination: explicit claim posted to airc 00:25Z; codex on orthogonal VDD work per their 00:25:13Z broadcast. No collision. Co-authored-by: Test <test@test.com>
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…ase/active split + restore-speculation-one-step-later Stacks on #1364 (PR-3c3 apply_cascade_step_to_policy, MERGED). PR-3c3 shipped the pure function. PR-3c4 wires it into LocalSubstrateGovernor with the base-vs-active policy split + the spec's restore-speculation-one-step-later anti-oscillation rule. What changed in local.rs: - LocalSubstrateGovernor.base_policy: Mutex<GovernorPolicy> field added. Holds the canonical un-throttled policy (cascade_step always 0). Cascade transitions re-derive active from base via apply_cascade_step_to_policy, never from the already-throttled current. This addresses PR-3c3's not-reversible-from-transformed documented limitation. - SnapshotState.pending_speculation_retreat: bool added. Tracks whether the cascade just retreated; if true, the NEXT Hold or Retreat restores speculation to the lower-step value. The first retreat keeps speculation at the higher-step (pre-retreat) value for one more cycle. - new() initializes base_policy from the supplied initial_policy (cascade_step normalized to 0 on the base; active keeps the supplied cascade_step). - try_hardware_detected() refreshes base_policy + resets cascade (step 0, last_step_change_ms now, pending_speculation_retreat cleared). New hardware = fresh start; existing pressure state discarded. - on_pressure_signal() rewired: * Same time-in-step gate as PR-3c2 (Advance from step > 0 within MIN_TIME_IN_STEP_MS Hold; emergency bypasses; retreat never gated) * On step change: clone base_policy + call apply_cascade_step_to_policy + bump policy_version + update committed_at_ms * On retreat: also apply prev_step's speculation to next_policy (one-step-later semantics) + set pending_speculation_retreat * On Advance after pending-retreat: clear marker (new pressure re-throttles speculation immediately) * On Hold with pending marker: deliver the restoration (publish new policy with current_step's speculation; clear marker) Restore-speculation-one-step-later rationale (from spec): Speculation thrash is the most user-visible cascade flapping. By keeping speculation throttled for ONE EXTRA cycle after the cascade retreats, we dampen the most observable form of oscillation while letting the rest of the policy (tier sizes, cadence, concurrency) restore immediately. The cost is one cycle of slightly-throttled speculation; the benefit is no observable flicker between Aggressive and Balanced (or whatever pair the cascade is bouncing between). Failure-mode discipline: - Base policy is the ONLY source of truth for transformations. Active is always derived; never mutated in place. - Restore-one-step-later is typed (bool marker, not a magic time comparison or a sentinel value). - Hardware change wipes pending retreat marker — new hardware = clean slate; old cascade state doesn't bleed into new policy. Tests: 29 passing on cargo test --lib --features metal,accelerate governor::local:: (22 prior + 7 new for PR-3c4) NEW (7): - advance_derives_active_from_base_with_step_transformations - emergency_advance_applies_full_throttle_transformations (full step-5 cumulative: tier_sizes shrunk, federation maxed, consolidation Manual, speculation dropped, personas-1) - retreat_holds_speculation_for_one_more_cycle (anti-oscillation rule pinned: Advance 0→1 drops Aggr→Balanced; Retreat 1→0 KEEPS Balanced; next Hold RESTORES Aggressive) - advance_during_pending_retreat_clears_marker - hardware_detected_refreshes_base_and_resets_cascade - advance_then_retreat_returns_to_base_values_modulo_speculation_dampening (proves derive-from-base prevents compounding transformations — was PR-3c3's not-reversible warning) - (helpers: policy_with_l1, policy_with_l1_nvidia) Stack: - #1345 / #1350 / #1352 / #1354 / #1356 / #1360 / #1364 — Lane H PRs MERGED - This PR (PR-3c4): wire apply_cascade_step_to_policy + base/active split + restore-speculation-one-step-later - Future PR-3d: file watcher (notify crate) — hot-reload policy file changes via set_candidates - Future PR-4: PressureBroker → governor wiring (subscribe to typed pressure events from broker) VDD evidence N/A — wiring + state machine. Evidence with PR-4 + harness measurements when real pressure flows + downstream consumers read throttled policy fields. Coordination: explicit claim posted 00:40Z; codex on demand-aligned- recall PR-1 per their 00:40:22Z broadcast. claude-tab-1 on whatever- next. No collision.
4 tasks
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… bridge
Pure-function bridge between PressureBroker's PressureAlert surface
(disk/memory pool eviction events) and the governor's typed
PressureSignal cascade input. Per GENOME-FOUNDRY-SENTINEL.md Part 11
line 1121: "PressureBroker informs the SubstrateGovernor. Pressure
signals from the broker drive the governor's adjustment cascade."
Scope:
- `alert_to_signal(&PressureAlert) -> Option<PressureSignal>` — pure
mapping. High/Critical tier → SystemMemHigh{used_pct}; Normal/
Warning/unknown → None.
- `governor_alert_sink(Arc<dyn SubstrateGovernor>) -> AlertSink` —
factory that wraps a governor as an AlertSink the broker can register
via `PressureBroker::add_alert_sink`. Sink derives the signal and
forwards via `governor.on_pressure_signal` when Some; drops when None.
NOT in this PR (deferred to PR-5):
- Wiring the sink into PressureBrokerModule's boot path. The bridge is
the data-side primitive; the wiring is a separate concern.
- Pool-name-aware mapping (vram → VRAMHigh, etc.). Today's broker pools
are all memory-adjacent (Docker disk, HF cache, future VRAM via
GpuMemoryManager); SystemMemHigh is the conservative single-mapping
the cascade reacts to identically. Refinement when pool tier_name
conventions stabilize.
Discipline:
- No silent default-on-error. Mapping is total — every alert maps to
either Some(signal) or None explicitly.
- Pressure clamped to [0.0, 1.0] before percent conversion so transient
over-budget snapshots map to 100% and negative artifacts map to 0%
rather than wrapping via `as u8`.
- Sink forwards via `Arc<dyn SubstrateGovernor>` (object-safe trait) so
the bridge does not depend on LocalSubstrateGovernor concretely.
Tests (14, all passing):
- normal/warning/unknown tiers -> None (4 tests)
- high/critical tiers -> SystemMemHigh with rounded used_pct (3 tests)
- pressure clamping above 1.0 + below 0.0 + rounding (3 tests)
- sink forwarding high/critical + non-forwarding normal/warning (4 tests)
- sink survives construction-scope drop + multi-call ordering (2 tests)
Lane H 8-PR stack progress: PR-1 (#1330/1331) -> PR-2 (#1345) -> PR-3a
(#1352) -> PR-3b (#1354) -> PR-3c1 (#1356) -> PR-3c2 (#1360) -> PR-3c3
(#1364) -> PR-3c4 (#1365) -> **PR-4 (this PR)**. PR-3d governor file
watcher in flight from codex on parallel branch (no overlap).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
joelteply
pushed a commit
that referenced
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May 17, 2026
… bridge
Pure-function bridge between PressureBroker's PressureAlert surface
(disk/memory pool eviction events) and the governor's typed
PressureSignal cascade input. Per GENOME-FOUNDRY-SENTINEL.md Part 11
line 1121: "PressureBroker informs the SubstrateGovernor. Pressure
signals from the broker drive the governor's adjustment cascade."
Scope:
- `alert_to_signal(&PressureAlert) -> Option<PressureSignal>` — pure
mapping. High/Critical tier → SystemMemHigh{used_pct}; Normal/
Warning/unknown → None.
- `governor_alert_sink(Arc<dyn SubstrateGovernor>) -> AlertSink` —
factory that wraps a governor as an AlertSink the broker can register
via `PressureBroker::add_alert_sink`. Sink derives the signal and
forwards via `governor.on_pressure_signal` when Some; drops when None.
NOT in this PR (deferred to PR-5):
- Wiring the sink into PressureBrokerModule's boot path. The bridge is
the data-side primitive; the wiring is a separate concern.
- Pool-name-aware mapping (vram → VRAMHigh, etc.). Today's broker pools
are all memory-adjacent (Docker disk, HF cache, future VRAM via
GpuMemoryManager); SystemMemHigh is the conservative single-mapping
the cascade reacts to identically. Refinement when pool tier_name
conventions stabilize.
Discipline:
- No silent default-on-error. Mapping is total — every alert maps to
either Some(signal) or None explicitly.
- Pressure clamped to [0.0, 1.0] before percent conversion so transient
over-budget snapshots map to 100% and negative artifacts map to 0%
rather than wrapping via `as u8`.
- Sink forwards via `Arc<dyn SubstrateGovernor>` (object-safe trait) so
the bridge does not depend on LocalSubstrateGovernor concretely.
Tests (14, all passing):
- normal/warning/unknown tiers -> None (4 tests)
- high/critical tiers -> SystemMemHigh with rounded used_pct (3 tests)
- pressure clamping above 1.0 + below 0.0 + rounding (3 tests)
- sink forwarding high/critical + non-forwarding normal/warning (4 tests)
- sink survives construction-scope drop + multi-call ordering (2 tests)
Lane H 8-PR stack progress: PR-1 (#1330/1331) -> PR-2 (#1345) -> PR-3a
(#1352) -> PR-3b (#1354) -> PR-3c1 (#1356) -> PR-3c2 (#1360) -> PR-3c3
(#1364) -> PR-3c4 (#1365) -> **PR-4 (this PR)**. PR-3d governor file
watcher in flight from codex on parallel branch (no overlap).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
joelteply
added a commit
that referenced
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May 17, 2026
) Pure-function bridge between PressureBroker's PressureAlert surface (disk/memory pool eviction events) and the governor's typed PressureSignal cascade input. Per GENOME-FOUNDRY-SENTINEL.md Part 11 line 1121: "PressureBroker informs the SubstrateGovernor. Pressure signals from the broker drive the governor's adjustment cascade." Scope: - `alert_to_signal(&PressureAlert) -> Option<PressureSignal>` — pure mapping. High/Critical tier → SystemMemHigh{used_pct}; Normal/ Warning/unknown → None. - `governor_alert_sink(Arc<dyn SubstrateGovernor>) -> AlertSink` — factory that wraps a governor as an AlertSink the broker can register via `PressureBroker::add_alert_sink`. Sink derives the signal and forwards via `governor.on_pressure_signal` when Some; drops when None. NOT in this PR (deferred to PR-5): - Wiring the sink into PressureBrokerModule's boot path. The bridge is the data-side primitive; the wiring is a separate concern. - Pool-name-aware mapping (vram → VRAMHigh, etc.). Today's broker pools are all memory-adjacent (Docker disk, HF cache, future VRAM via GpuMemoryManager); SystemMemHigh is the conservative single-mapping the cascade reacts to identically. Refinement when pool tier_name conventions stabilize. Discipline: - No silent default-on-error. Mapping is total — every alert maps to either Some(signal) or None explicitly. - Pressure clamped to [0.0, 1.0] before percent conversion so transient over-budget snapshots map to 100% and negative artifacts map to 0% rather than wrapping via `as u8`. - Sink forwards via `Arc<dyn SubstrateGovernor>` (object-safe trait) so the bridge does not depend on LocalSubstrateGovernor concretely. Tests (14, all passing): - normal/warning/unknown tiers -> None (4 tests) - high/critical tiers -> SystemMemHigh with rounded used_pct (3 tests) - pressure clamping above 1.0 + below 0.0 + rounding (3 tests) - sink forwarding high/critical + non-forwarding normal/warning (4 tests) - sink survives construction-scope drop + multi-call ordering (2 tests) Lane H 8-PR stack progress: PR-1 (#1330/1331) -> PR-2 (#1345) -> PR-3a (#1352) -> PR-3b (#1354) -> PR-3c1 (#1356) -> PR-3c2 (#1360) -> PR-3c3 (#1364) -> PR-3c4 (#1365) -> **PR-4 (this PR)**. PR-3d governor file watcher in flight from codex on parallel branch (no overlap). Co-authored-by: Test <test@test.com> Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Lane H PR-3b per GENOME-FOUNDRY-SENTINEL #1327 Part 11. Stacks on #1352 (codex's PR-3a policy_selector, MERGED).
LocalSubstrateGovernoris the reference impl of theSubstrateGovernortrait (from #1345 PR-1). Holds the live policy behindarc_swapfor wait-free reads; mutex-protected snapshot history for telemetry.What ships
src/workers/continuum-core/src/governor/local.rs:LocalSubstrateGovernorstruct:Arc<ArcSwap<GovernorPolicy>>for policy +Mutex<SnapshotState>for cascade-transition-count + recent-signals ringnew(initial_policy)— ready to servecurrent_policy()immediatelyset_candidates(Vec<PolicyFile>)— PR-3d (file watcher) calls on fs change events; for PR-3b set manuallytry_hardware_detected(hw)+on_hardware_detected(hw)— trait method returns typedPolicySelectionError; current policy unchanged on failure (caller can't miss it)on_pressure_signal(signal)— records into ring (PR-3c adds threshold/cascade logic)snapshot()→GovernorSnapshotcandidate_count()— diagnostic for "did the file watcher load anything?"Concurrency model
Per spec: "never blocks reads."
arc_swap.load_full()→Arc<GovernorPolicy>clone (wait-free)arc_swap.store(Arc::new(new_policy))+ mutex on snapshot state for transition-count bump (~µs hold)Tests prove the wait-free guarantee:
many_concurrent_reads_dont_block—Arc<Self>+ 16 threads × 1000 reads eachconcurrent_read_during_write_sees_consistent_snapshot— writer mutates + reader observes Arc snapshots always one of {1, 2, 8} — no torn readFailure-mode discipline
PolicySelectionErrorrather than swallowing selection failures (codex's review fold-in tightened this from the original spec's void return)on_hardware_detectedwith empty candidates → typed error (no silent no-op; codex's tightening)cascade_transition_countincrements per PUBLISH, not per call — failed selections don't counton_pressure_signaldoes NOT bump cascade_transition_count in PR-3b (test pins this so PR-3c lands the threshold logic together)What this PR DOES NOT do
notifycrate)PressureBrokersubscription wiring (PR-4)Test plan
16 passing on
cargo test --lib --features metal,accelerate governor::local::(79 total acrossgovernor::covering PR-1 + PR-2 + PR-3a + PR-3b)new()serves initial policy immediatelycandidate_countreflectsset_candidateson_hardware_detectedpublishes matching policytry_hardware_detectedreturnsNoMatchingPolicyerron_hardware_detectedno-match KEEPS previous policyon_hardware_detectedempty candidates returns typed erroron_pressure_signalrecords signalrecent_signalsring capped atRECENT_SIGNALS_CAPACITY=32(FIFO eviction)snapshotincludes policy + signalscascade_transition_countincrements per publishcascade_transition_countUNCHANGED on no-matchon_pressure_signaldoes NOT transition in PR-3b (PR-3c adds it)many_concurrent_reads_dont_block(16 threads × 1000 reads)concurrent_read_during_write_sees_consistent_snapshotcurrent_policyreturns same Arc when no writes (Arc::ptr_eq)Added deps
arc-swap = "1.7"— tiny crate, no transitive deps.Coordination
policy_selectorAPI (arg order:select_policy(policies, hw); error variantsEmptyAppliesTo / UnknownConstraint / MalformedRange / NoMatchingPolicy { fingerprint } / AmbiguousPolicy { fingerprint, count })Stack
policy_selector(codex, MERGED)LocalSubstrateGovernor+arc_swappublishnotifycrate)PressureBroker→ governor wiringVDD evidence
N/A — pure-state impl. Evidence with PR-3c when cascade is wired + with PR-4 when actual pressure signals flow.