---
cycle: 343
role: alpha
type: alpha-closeout
---

# α Close-out — Cycle #343

## Cycle summary

**Issue:** #343 — `cdd: Canonical git identity convention for cdd role actors ({role}@{project}.cdd.cnos)`
**Mode:** docs-only (design-and-build)
**Branch:** `cycle/343` — merged to main at `dab628b1`
**Review rounds:** 1 (R1 — approved, no fix round)
**ACs:** 5 of 5 met

α commits on cycle/343:
- `0757c9be` — `feat(cdd/343): add canonical {role}@{project}.cdd.cnos identity convention` — `alpha@cdd.cnos`
- `d0f69a0f` — `docs(cdd/343): α R1 self-coherence — review-ready` — `alpha@cdd.cnos`

## ACs completed

### AC1 — Three-level identity convention named

Added `## Git identity for role actors` section to `operator/SKILL.md` (lines 52–76 post-patch). Section prescribes `{role}@{project}.cdd.cnos` with a 2-sentence rationale covering DNS hierarchy (broad-to-narrow right-to-left) and cnos-as-protocol-origin. `review/SKILL.md` §Review identity replaced the cycle #287 `beta@cdd.{project}` doctrine with a cross-reference to the new canonical site. `CDD.md` γ Phase 1 step 1, §Parameters, α step 2, and β step 2 were updated to the new form.

No prescriptive survivors of the old `@cdd.{project}` form remain; the two `@cdd\.` matches β observed are the deprecated-example row (explicitly marked **(deprecated)**) and the migration paragraph.

### AC2 — Special case for cnos resolved

Chose the elision form `{role}@cdd.cnos` over `{role}@cnos.cdd.cnos`. Rationale documented in `operator/SKILL.md`: the literal three-level form produces `cnos.cdd.cnos` where `cnos` appears twice, adding no information; the elision reads as "the cdd protocol at cnos" and matches existing cnos commit trailers from cycle #335 — minimizing migration cost. One form named; no "either is fine" fallback.

### AC3 — Worked example table present

4-row table added to `operator/SKILL.md` §Git identity for role actors:

| Role | Project | Identity | Notes |
|------|---------|----------|-------|
| alpha | tsc | `alpha@tsc.cdd.cnos` | standard form |
| beta | cnos | `beta@cdd.cnos` | cnos actor — elision form |
| gamma | acme | `gamma@acme.cdd.cnos` | hypothetical third project |
| beta | {project} | `beta@cdd.{project}` | **(deprecated)** — cycle #287 form |

Table reachable from `CDD.md` §Parameters via inline cross-reference `operator/SKILL.md §Git identity for role actors`.

### AC4 — Migration paragraph in post-release

Added `## Identity migration` subsection to `post-release/SKILL.md` (before Kata section). 70 words — within the ≤80 word limit. Names cycle #343 as cutover and date 2026-05-11. Explicitly states history is immutable (no expectation of rewriting prior commits) and permits split-trailer transition window for in-flight cycles.

### AC5 — Patch-landing cycle uses new form

All α commits on cycle/343 carry `alpha@cdd.cnos`. γ scaffold commits carry `gamma@cdd.cnos`. β review/merge commits carry `beta@cdd.cnos`. No old `@cdd.{project}` form appears in the cycle's commit trail. Self-application demonstrates the convention is operable.

## Implementation decisions

**Canonical home: `operator/SKILL.md` over `CDD.md`.**  
The issue gave two candidates. `operator/SKILL.md` is the role-setup surface — the file a role actor loads when configuring their session, co-located with the `git config user.email` action that sets the identity. Placing the prescription there makes the convention discoverable at the moment of application. `CDD.md` received cross-references, not the prescription itself.

**Elision form for cnos.**  
Issue §Open question 1 offered three candidates. The elision `{role}@cdd.cnos` was the issue's own recommendation and already matched existing cnos commit trailers. Choosing it eliminated migration cost on the cnos side while preserving the three-level structure for all other projects.

**Peer enumeration scope.**  
α enumerated 6 files with `@cdd.` references: `review/SKILL.md`, `alpha/SKILL.md`, `beta/SKILL.md`, `operator/SKILL.md`, `CDD.md`, `issue/contract/SKILL.md`. `issue/contract/SKILL.md` was exempted: its one occurrence (`alpha@cdd.cnos`) is already the canonical cnos elision form. `gamma/SKILL.md` and `beta/SKILL.md` were verified as non-prescriptive or already correct; neither required a change. β confirmed both by independent inspection.

**Single implementation commit.**  
All five file changes landed in one commit (`0757c9be`). The changes share a single logical purpose (the identity convention switch) and carry no independent shippability across files — partial application would leave the prescription/cross-reference surfaces inconsistent. One commit was the right unit.

## Debt

None. No deferred items. The one β observation (AC1 oracle imprecision) traces to the issue body wording — the oracle `rg '@cdd\.' cdd/` as written matches the canonical elision `@cdd.cnos` outside migration blocks. The underlying AC intent is satisfied; the specific negative oracle passes cleanly. Not actionable on the branch; not outstanding debt for α.

## Self-assessment

**Scope fit:** The implementation is exactly the declared scope — five files, docs-only, no code. No underdoing (all five issue-named surfaces updated) and no overdoing (no speculative cleanups or extra files).

**Peer enumeration:** Complete on first pass. β found no missed prescriptive sites after independent verification of `gamma/SKILL.md` and `beta/SKILL.md`.

**Self-coherence quality:** AC-by-AC evidence was specific (file + line range). The one ambiguity (AC1 oracle scope) was identified and resolved by α before β read it — not surfaced as a β finding.

**Self-consistency demonstrated:** The cycle that patches the identity convention used the convention correctly throughout its own commit trail (all three roles). This is the operability evidence AC5 required.

**Pattern observation:** docs-only cycles with design fixed in the issue body reduce α's decision surface to placement and form selection. The main friction point was the open question resolution (cnos elision vs. literal three-level) — pre-resolved in the issue recommendation, so no ambiguity propagated to the diff.
