# CDD/CDS Iteration — cycle/409 / cnos#409

**Cycle:** Sub 4 of cnos#403 — Migrate §Coordination surfaces + §Artifact contract to CDS.md (B-lite thin extract)
**Date:** 2026-05-22
**`protocol_gap_count`: 0**
**Status: Courtesy stub** (no `cdd-*-gap` or `cds-*-gap` findings; filed per the cnos#401 cadence convention — write a stub for zero-finding cycles for aggregator traceability)

## Findings

None. The cycle produced 6 informational findings (3 α, 3 β) per the close-out triage table in `gamma-closeout.md §"Close-out triage table"`; all 6 are editorial observations or contract-pinned design decisions, not protocol gaps. No `cds-skill-gap` / `cds-protocol-gap` / `cds-tooling-gap` / `cds-metric-gap` (or pre-rename `cdd-*-gap`) class fired.

## §9.1 trigger assessment (recap)

Per `gamma-closeout.md §"§9.1 trigger assessment"`:

- Review rounds > 2: No (R1 APPROVED).
- Mechanical-finding overload (mechanical findings > 20%): No (0 mechanical findings; 6 informational).
- Avoidable tooling / environment failure: No.
- Loaded skill failed to prevent a finding: No.
- AC oracle ambiguity recurrence: No.
- CI red post-merge: N/A (docs-only cycle).

No triggers fired. Courtesy stub is the only required output for this cycle's ε artifact.

## Patterns observed (informational; no patch)

- **B-lite shape converges cleanly when the source content has a canonical-vs-operational split.** The pre-#402 CDD.md §1.5 (Tracking) and §5 (Artifact Contract) had exactly the canonical-rule-statement / operational-realization split the B-lite ruling assumes. Sub 3 demonstrated the same shape worked for §Selection function + §Development lifecycle; Sub 4 confirms it for §Coordination surfaces + §Artifact contract. The pattern is structurally portable to Sub 5's surfaces (§Review, §Gate, §Closure, §Assessment, §Retro-packaging, §Non-goals, §Mechanical, §Large-file) — each of those sections in pre-#402 CDD.md has a similar canonical-rule + cdd-side operational realization split. Worth noting for Sub 5's dispatch.
- **The `### Operational realization` sub-heading pattern (Sub 3 introduced; Sub 4 extended) is the structural escape valve.** Every new CDS canonical section can name the cdd-side operational realization at the bottom without duplicating the mechanics. The pattern is now an established convention; future canonical-content migrations follow it without re-deriving.
- **The `.cdd/` → `.cds/` re-rooting documentation in two places (§Cycle-state evidence + §Location matrix) feels right.** Sub 6 (CDD.md marker sweep) plus the eventual re-rooting cycle can grep both surfaces uniformly for "re-rooting" or for the dual-naming convention. No protocol gap; just a pattern worth preserving.

## MCA / next-action

None this cycle. The next MCA is Sub 5 of cnos#403 per the wave shape; operator dispatches when ready.

## INDEX.md row

The aggregator at `.cdd/iterations/INDEX.md` gets one row appended:

```
| 409 | #409 | 2026-05-22 | 0 | 0 | 0 | 0 | .cdd/unreleased/409/cdd-iteration.md |
```

Schema per `cnos.cdd/skills/cdd/CDD.md §"Cycle Iteration"` (now §Field 5 in CDS): Cycle / Issue / Date / Findings / Patches / MCAs / No-patch / Path. Zero-finding row marks the cycle in the aggregator without claiming protocol-improvement activity. This row is added in the same close-out commit.
