# ε cdd-iteration — cycle/413

**Issue:** [cnos#413](https://github.com/usurobor/cnos/issues/413) — Activate Sigma; case (d.2) cross-repo bundle for cn-sigma.
**Mode:** docs-only cross-repo authoring; γ+α+β-collapsed-on-δ. Per ε hygiene, empty findings are recorded explicitly.

## Findings

**None.**

This was a docs-only cross-repo bundle authoring cycle producing 5 new files under `.cdd/iterations/cross-repo/cn-sigma/sigma-activation-2026-05-22/` (case (d.2)). No tooling, no schemas, no build/test surface was touched. The cycle had no review-oracle ambiguity, no β-α dispatch round (β-α-collapsed-on-δ explicitly), no protocol-shape disagreement, no out-of-band coordination friction. The δ-pinned implementation contract was complete and unambiguous; α executed within it; β confirmed conformance.

## Protocol-gap signals (across receipt-stream)

**None surfaced this cycle.** Three non-blocking observations from β's R1 review are recorded as positive notes, not protocol-gap signals:

1. **`@@ EOF @@` precedent pattern.** The discipline-section-2026-05-19 precedent shipped patches with non-parseable `@@ EOF @@` hunk markers. This cycle ships patches with proper `@@ -L,M +L,N @@` hunks + placeholder line numbers + trailing-context anchors + `git apply --recount` apply-command. This is an *improvement* on the precedent that may want to be ratified into `cross-repo/SKILL.md §2.7` as the canonical form for content-anchored patches without exact line-number knowledge — but it is a positive forward-looking observation, not a gap surfaced *by this cycle's failure*. The next cross-repo authoring cycle may want to file a small ε-driven issue codifying the pattern; this cycle did not encounter the gap as a *blocker* (α detected it via end-to-end synthetic-apply test, surfaced it, and resolved it within the dispatch contract).

2. **Hat-collapse documentation for case (d).** `cross-repo/SKILL.md §2.9` requires hat-collapse acknowledgment for case (c) bilateral bundles. This cycle is case (d.2) and documents the γ+α+β-collapsed-on-δ collapse in LINEAGE.md anyway (over-conformance, not under-conformance). §2.9 could be extended to formally require hat-collapse acknowledgment for case (d) when the bundle is collapsed-role-authored — but this is an additive clarification, not a gap that produced friction.

3. **Anchor doc line count.** Issue body D5 says "~300–400 lines"; the doc is 253 lines. The mechanical AC6 oracle (≥10 sub-sections with cycles cited) is satisfied. The line-count target is aspirational guidance, not a binding AC; β recorded this as a non-blocking observation.

None of these rise to a `cdd-skill-gap`, `cdd-protocol-gap`, `cdd-tooling-gap`, or `cdd-metric-gap` finding for this cycle. They are forward-looking notes for future ε signal aggregation.

## Non-findings (worth recording)

- **`mcp__github__issue_read` worked for AC9 spot-check.** All 9 cited cnos issues (#366/#376/#391/#392/#393/#402/#403/#404/#405) read successfully via the MCP GitHub bridge. No fetch failures.
- **`git apply --recount` worked end-to-end.** All 3 patches applied cleanly to a synthetic cn-sigma layout in `/tmp/testfinal/` (PERSONA.md + OPERATOR.md with the known section headings). The `--recount` mode regenerated hunk-header line numbers from context-match; section stacking landed in the correct order (Discipline → Engineering-persona protocol commitments → Receipt requirements — anti-gaming guardrails → Continuity rule for PERSONA; CDD wave-execution pattern inserted before Durable preferences only for OPERATOR).
- **AC8 (no cnos package edits) was structurally enforced by the docs-only nature of the work.** `git diff --cached --stat -- src/packages/` returned empty throughout authoring; no risk of accidental cross-layer leak.

## Verdict

No ε action required. No protocol patch to file. No follow-on Sub to spin.

`protocol_gap_count: 0`.

This courtesy stub is filed per `post-release/SKILL.md §5.6b` close-out shape (cdd-iteration.md required when `protocol_gap_count > 0`; courtesy stub for clean cycles is the convention established by cnos#396 and cnos#411 close-outs).
