# cdd-iteration — cycle/418

**Issue:** [cnos#418](https://github.com/usurobor/cnos/issues/418)
**Date:** 2026-05-22
**Cycle:** 418 (Sub 4 of cnos#404 wave)
**Receipt status:** `protocol_gap_count: 0` — courtesy stub per backward-compatibility allowance

## Cadence

Per `cnos.cdd/skills/cdd/post-release/SKILL.md §5.6b` cadence rule: `cdd-iteration.md` is required only when `protocol_gap_count > 0`. This cycle's receipt carries `protocol_gap_count: 0`; the artifact is **optional**. This stub is written as courtesy (backward-compatibility allowance per §5.6b — empty-findings files remain valid artifacts).

## Findings

None.

- 0 `cdd-skill-gap` findings
- 0 `cdd-protocol-gap` findings
- 0 `cdd-tooling-gap` findings
- 0 `cdd-metric-gap` findings

No findings of any class. No patches landed; no MCAs filed; no `no-patch` reasons recorded.

## Why no findings

The cycle's matter was a parallel-surface package-migration: two new sub-skills authored in one cycle from an empirical anchor (cnos#391) and from wire-format invariants extracted from cnos.cds + cnos.cdd source surfaces. The dispatch contract (γ scaffold + 7-axis implementation contract + 11 ACs + open-question rulings + boundary decisions) covered every authoring decision. The collapse call — two parallel surfaces in one cycle sharing consumers + close-out overhead — was operationally clean per the Sub 2 (cnos#416) + Sub 3 (cnos#417) precedent.

No protocol gap surfaced because:

- The Sub 2 / Sub 3 precedent provided a stable three-ruling pattern (move wholesale; replace source with pointer or add pointer; update cross-references) that Sub 4 mechanically applied to two parallel surfaces.
- The implementation contract pinned every axis (Language; Package scoping; cross-ref repair targets enumerated; backward-compat preservation explicit; cdr untouched; no schemas / runtime / cdd-verify changes; CDD.md kernel byte-identical).
- The open questions (Q3 split-vs-unify; Q5 per-row cds-boundary rulings) were resolved per the dispatch's recommendations, recorded in gamma-scaffold.md, and applied uniformly.
- The empirical anchor (cnos#391) was specific and well-documented; the rescue mechanism's wire-format extracted cleanly.

## Cross-repo trace

None. No findings with `patch-landed` + `Cross-repo` disposition. Note: this cycle *moved* the canonical home for the mid-flight rescue mechanism + the artifact-channel wire-format invariants, but did not itself perform any cross-repo coordination.

## Aggregator update

Appended to `.cdd/iterations/INDEX.md`: row for cycle 418 with `Findings = 0; Patches = 0; MCAs = 0; No-patch = 0`.
