CE64 across cycles: D-CE64-TIME-0, D-CE64-NEXTSTATE-0, D-STREAMDTO-0 (close the k→k+1 circuit)

[AdaWorldAPI]

Three probes, stacked. Commits 1–3 are D-CE64-TIME-0; commits 4–5 add the other two.

D-CE64-TIME-0 — CausalEdge64 survives a cycle

One declared MailboxSoA edges row (cycle-gated write_row, carried across tick(), read through MailboxSoaView) is the only cross-cycle state. Folds use the shipped CausalEdge64::learn over a per-cycle SupportLedger. The next-cycle reading is the #1370 law, moved unchanged to examples/shared/affordance_law.rs.

Eligibility over cycles 0..3: OBS, OBS, OBS|STRATIFY, OBS (accumulation, then certification, then contradiction). 10 tests, 9 disable runs red. The finding is ISS-NO-EVIDENCE-WRITER-FOR-EPISTEMIC-STATE: nothing in production writes bits 59..63 from evidence.

D-CE64-NEXTSTATE-0 — sparse next-state register

ce64_nextstate_probe, 6 tests, 7 disable runs red.

• Only bits 59..63 move, checked for all 32 codes.
• The write crosses write_row → tick → view.
• The mailbox does not double-buffer. Next-cycle authority is a read discipline.
• LE round trip and restart both hold.
• The shipped with_spare + with_truth compile to bzhi; shl; or, so no new 5-bit writer is added.

Production change: CausalEdge64::to_le_bytes / from_le_bytes (mirroring EpisodicEdges64), plus the register contract on the type.

D-ANCESTRY-K1-0 — what .claude/v3 says, against the code

Git history is shallow at #1327, so this rests on the code and the board. The v3 ladder Φ StreamDto → Ψ PerturbationDto → B BusDto was meant to close a loop:

• EmitMode::Persist names the row;
• persist_cycle writes emitted_edges[0];
• the mailbox-thoughtspace shim reads it on the next dispatch.

It was never closed at either end:

• ingress wrote only the BindSpace singleton, which the SoA supersedes;
• the driver owned its mailbox read-only, and run() is &self.

Path B (intended, not completed). Full map and per-DTO classification: entries/2026-10-06-streamdto-circuit-ancestry.md.

D-STREAMDTO-0 — a real StreamDto to next-cycle eligibility, on the SoA

Production changes, both at the SoA boundary; no new DTO, scheduler or temporal type; StreamDto and the #1370 law are untouched:

• engine_bridge::ingest_codebook_indices_soa: a StreamDto's fields go straight into the owner's MailboxSoA through the cycle-gated write_row. It shares the per-index encoding with the singleton arm, so the two cannot drift.
• ShaderDriver::mailbox_mut: the owner's write-back route.

streamdto_circuit_probe, 6 tests, plus 1 default-feature lib test; 9 disable runs red. The path, with BindSpace off it:

1. StreamDto → SoA;
2. dispatch k;
3. emitted_edges[0] written to persisted_row;
4. tick;
5. dispatch k+1 reads the edge, and its output changes.

Measured limits:

• The edge steers k+1 only through s_idx / 4. F/C are revised and discarded, and bits 59..63 are never read. A write-back into block 0 is invisible to k+1, and so is one into a block whose self-hit carries the same predicates.
• The shader writes code 0, so D-GSO-AFF-0: recipe eligibility as a measurement over CausalEdge64 #1370 eligibility is unchanged by the circuit: 0x20, the same as an unwritten word. Code 7 written into the same row gives 0x24.
• StreamDto::timestamp is the caller's number, not the cycle, and cycle_index never reaches the edge (v2 drops pack's temporal).
• Restart from LE bytes reproduces k+1.

Residue: CognitiveShaderBuilder still requires a BindSpace on the mailbox arm (W7).

CI: new feature-gated step. w2_differential and the new probe were never run by the default-feature job.

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https://claude.ai/code/session_01T8w7Ucm7NhitfTduFKmhYx

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📝 Walkthrough

Walkthrough

The change adds a CausalEdge64 cycle-survival probe, shares the affordance-law implementation with an existing probe, and records observed behavior and limitations in the project board.

Changes

CE64 cycle-survival probe

Layer / File(s)	Summary
Shared affordance law crates/cognitive-shader-driver/examples/shared/affordance_law.rs, crates/cognitive-shader-driver/examples/affordance_measurement_probe.rs	The shared module defines epistemic-state mappings, recipe rules, compiled eligibility tables, and measurement. The existing probe imports these definitions instead of retaining its local implementation.
Cycle folding and eligibility crates/cognitive-shader-driver/examples/ce64_cycle_survival_probe.rs	The probe learns folds into a register, counts distinct sources in a cycle-local ledger, conditionally settles the epistemic code, and optionally writes the register to a mailbox row. Tests cover persistence, eligibility, replay, and cross-cycle evidence limits.
Probe registration and findings crates/cognitive-shader-driver/Cargo.toml, crates/cognitive-shader-driver/examples/README.md, .claude/board/ISSUES.md, .claude/board/STATUS_BOARD.md, .claude/board/entries/2026-10-06-ce64-cycle-survival.md, .claude/board/entries/README.md	The example is registered to run as a test and documented. Board entries record probe results, mark two items Shipped, and describe the missing production evidence transition and cross-cycle source identity.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Other

Sequence Diagram(s)

sequenceDiagram
  participant Schedule
  participant MailboxSoA
  participant Cycle
  participant CausalEdge64
  participant SupportLedger
  participant AffordanceLaw
  Schedule->>MailboxSoA: Read edge register
  MailboxSoA->>Cycle: Provide register and folds
  Cycle->>CausalEdge64: Learn each fold
  Cycle->>SupportLedger: Count distinct sources for this cycle
  Cycle->>AffordanceLaw: Measure register eligibility
  Cycle->>MailboxSoA: Write register when persistence is enabled

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Suggested reviewers: claude

Merge Risk: 🔵 Low · up to d542a

This change adds an example probe and board documentation. The only remaining problem is that one new status-board row renders truncated because of an unescaped pipe character. Escape it before or after merging; no runtime behavior is affected.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

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Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title identifies the main change: testing CausalEdge64 state across cycles. The additional issue identifiers make it longer than necessary, but the title remains clear and directly related to the …

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Docstring coverage is 71.43% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 28 functions across 3 files. (6 skipped: 6 unsupported.)

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---

_{A rabbit watched the edge bits glow,
Through cycles where the mailboxes flow.
Two sources joined; the code took flight,
Then doubts returned and changed its light.
The rabbit logs the trail at night.}

_{Comment @coderabbitai help to get the list of available commands.}

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Reviewed commit: d542af80e2

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Actionable comments posted: 1

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Inline comments:
Review comments at @.claude/board/STATUS_BOARD.md:
- Line 42: Escape the pipe in the `OBS|STRATIFY` value in the D-CE64-TIME-0 row
so Markdown renders it as content within the existing table cell and preserves
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📒 Files selected for processing (9)

• .claude/board/ISSUES.md
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• .claude/board/entries/2026-10-06-ce64-cycle-survival.md
• .claude/board/entries/README.md
• crates/cognitive-shader-driver/Cargo.toml
• crates/cognitive-shader-driver/examples/README.md
• crates/cognitive-shader-driver/examples/affordance_measurement_probe.rs
• crates/cognitive-shader-driver/examples/ce64_cycle_survival_probe.rs
• crates/cognitive-shader-driver/examples/shared/affordance_law.rs

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