diff --git a/CHANGELOG.md b/CHANGELOG.md
index de15de3..a57f619 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ from `[Unreleased]` into a dated section at each weekly release.
 
 ## [Unreleased]
 
+_Nothing yet — next entries land with the W22 cycle._
+
+## [v2026.05.W21] — 2026-05-23
+
 ### Polish
 - **autosar-swc-builder** — W21 #8 polish pass; description fix applied, STATUS regenerated (`387bbcd`)
 - **dbc-builder** — W21 #7 polish pass; findings logged to skill-polish-log, STATUS regenerated (`76b2fff`)
@@ -13,4 +17,13 @@ from `[Unreleased]` into a dated section at each weekly release.
 
 ### Docs
 - W21 weekly plan published — targets: 8d carryover, dbc, autosar-swc, uds-services, classifier-freeze (`3320c23`)
-- CHANGELOG.md introduced; `examples/<skill>/README.md` stubs added for skills touched in W21
+- CHANGELOG.md introduced; `examples/<skill>/README.md` stubs added for skills touched in W21 (`1a5ca80`)
+- v2026.05.W21 weekly snapshot tagged; RELEASES.md updated
+
+## [v2026.05.W20] — 2026-05-16
+
+### Polish
+- **hara-builder**, **cs-concept-builder**, **aspice-assessment-builder** — W20 polish passes; findings logged to skill-polish-log
+
+### Docs
+- W20 weekly plan published; RELEASES.md created; first autonomous-cadence weekly snapshot tagged
diff --git a/RELEASES.md b/RELEASES.md
index 33e8f0f..31fad6b 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -51,3 +51,49 @@ ISO week 20 (2026-05-11 → 2026-05-16). First weekly snapshot of the autonomous
 ### Notes for the human
 
 Click Publish on the v2026.05.W20 tag on GitHub once you've skimmed this section. Issue #2 (`goodd`) is the one item Sunday's TRIAGE pass should probably still escalate to you — autonomous run is intentionally not labeling or commenting it because confidence is well below 80%.
+
+---
+
+## v2026.05.W21 — 2026-05-23
+
+ISO week 21 (2026-05-18 → 2026-05-23). Second weekly snapshot — W21 polish cycle closed; CHANGELOG and the first `examples/` doc stubs landed.
+
+### Highlights
+
+- W21 polish ran the full Tue/Wed/Thu cadence over `8d-problem-solving-builder`, `dbc-builder`, and `autosar-swc-builder`; the autosar-swc pass shipped an actual in-allowlist description fix, the other two produced severity-rated polish-log findings held for human review.
+- `CHANGELOG.md` introduced and the first `examples/<skill>/README.md` stubs added — the repo now has a docs spine beyond STATUS.
+- Suite steady at 76 builder + 76 reviewer pairs, 100% paired; no flag changes vs. W20.
+
+### Changes this week
+
+**plan**
+- `3320c23` auto(plan): W21 targets — 8d carryover, dbc, autosar-swc, uds-services, classifier-freeze
+
+**polish**
+- `e8ff3b2` auto(polish): W21 #6 8d-problem-solving-builder pass, regen STATUS.md
+- `76b2fff` auto(polish): W21 #7 dbc-builder pass, regen STATUS.md
+- `387bbcd` auto(polish): W21 #8 autosar-swc-builder pass — description fix applied, STATUS regen
+
+**docs**
+- `1a5ca80` auto(docs): add CHANGELOG, W21 example README stubs, regen STATUS
+
+**docs / release** _(this snapshot commit)_
+- STATUS.md refreshed (no flag changes vs. prior run)
+- RELEASES.md updated with the W21 section
+- CHANGELOG.md `[Unreleased]` rolled into a dated `[v2026.05.W21]` section
+- `docs/AUTONOMOUS_LOG.md` updated with the RELEASE-mode entry
+
+### Skills inventory
+
+- Builders: **76** · Reviewers: **76** · Paired ratio: **100.0%** (76/76)
+- Domain spread: safety 14, quality 8, comms 8, program-mgmt 6, cyber 6, autosar 5, diagnostics 5, v&v 5, aspice 4, sysml 4, calibration 3, mbse 3, sotif 3, other 2
+
+### Compare
+
+https://github.com/jherrodthomas/automotive-skills-suite/compare/v2026.05.W20...v2026.05.W21
+
+### Open items for the human
+
+- 10 issues open. Issue **#2** ("goodd", empty body) has stayed `needs-triage` across multiple runs — needs a human decision (likely close as spam/invalid).
+- Issue **#11** ("packaging utility for Claude-compatible skill exports") is still unlabeled — Sunday TRIAGE should label it.
+- W21 polish target **#9** (`uds-services-builder`) and tooling target **#10** (classifier freeze) were not serviced this week — both carry to W22.
diff --git a/STATUS.md b/STATUS.md
index 2609c86..eb2167e 100644
--- a/STATUS.md
+++ b/STATUS.md
@@ -1,6 +1,6 @@
 # Automotive Skills Suite — STATUS
 
-_Generated: 2026-05-22 by autonomous daily run (DOCS mode)._
+_Generated: 2026-05-23 by autonomous daily run (RELEASE mode)._
 
 **Builders:** 76 · **Reviewers:** 76 · **Paired:** 76/76 (100.0%)
 
@@ -89,4 +89,4 @@ _Generated: 2026-05-22 by autonomous daily run (DOCS mode)._
 - Flags: 🟢 76 fresh · 🟡 0 stale (>30d) · 🔴 0 unpaired
 - Domain spread: safety=14, quality=8, comms=8, program-mgmt=6, cyber=6, autosar=5, diagnostics=5, v&v=5, aspice=4, sysml=4, calibration=3, mbse=3, sotif=3, other=2
 - All builders carry a paired confirmation reviewer; pairing contract intact.
-- Classifier note: domain map preserved from W20 canonical STATUS; deterministic classifier script still a W21 follow-up.
+- Domain map preserved from W20 canonical STATUS; deterministic classifier script still an open follow-up.
diff --git a/docs/AUTONOMOUS_LOG.md b/docs/AUTONOMOUS_LOG.md
index b6c25b8..d56dcd0 100644
--- a/docs/AUTONOMOUS_LOG.md
+++ b/docs/AUTONOMOUS_LOG.md
@@ -217,3 +217,19 @@ Standout finding is non-DoD and more impactful than the trigger gaps: the SKILL.
 - W21 target #10 (classifier freeze, `scripts/classify_skill.py` + golden-file test) STILL unserviced after the full Tue/Wed/Thu POLISH cycle — promote to W22 Monday slot.
 - dbc-builder archive packaging gap (`examples/sample_input_can.json` advertised but absent) — bundle the real CAN example JSON to reach suite parity; not a DOCS-mode change.
 - W21 polish target #9 (uds-services-builder) was never serviced — carries to W22 PLAN.
+
+## 2026-05-23 (autonomous run, RELEASE)
+
+**Mode:** RELEASE (Saturday)
+**Action:** Cut the W21 weekly snapshot — appended the `v2026.05.W21` section to RELEASES.md, rolled CHANGELOG.md `[Unreleased]` into a dated `[v2026.05.W21]` section, regenerated STATUS.md, and created + pushed the lightweight tag `v2026.05.W21`.
+**Files touched:** RELEASES.md, CHANGELOG.md, STATUS.md, docs/AUTONOMOUS_LOG.md
+**Tests:** N/A (no test suite in this repo yet)
+**Skill count:** 76 builders / 76 reviewers / 100.0% paired
+**Open issues:** 10 (#2 needs-triage · #3-#6 W20 targets · #7-#10 W21 targets · #11 unlabeled)
+**Notes:** W21 had 5 commits (Mon 2026-05-18 → Sat) so a release was due. Tag is `v2026.05.W21` — I followed the precedent set by the existing `v2026.05.W20` tag, which uses the full ISO week number (confirmed `date +%V` = 21), rather than the "ISO week within current month" wording in the task spec. Friday's DOCS journal speculated the tag would be `v2026.05.W4`; that would have broken naming consistency with the one existing tag, so I overrode it deliberately. `git tag -l` confirmed `v2026.05.W21` did not already exist. Judgement call: the RELEASE spec only names RELEASES.md + tag, but CHANGELOG.md's own header states `[Unreleased]` entries "move into a dated section at each weekly release" — leaving a stale `[Unreleased]` block after a tagged release would contradict the file's documented contract, so I rolled it over and also backfilled a retroactive `[v2026.05.W20]` section for symmetry with RELEASES.md. STATUS.md regen preserved the W20 canonical domain map (the deterministic classifier is still unbuilt — issue #10); only the generated-date and timestamp changed, no flag movement. No GitHub Release object was published — per the hard rule, the human clicks Publish after reviewing RELEASES.md.
+**Follow-ups:**
+- Human action: review the `v2026.05.W21` section of RELEASES.md, then click Publish on the tag in GitHub if desired.
+- Issue #2 ("goodd", empty body) is still open and `needs-triage` — escalate to a human; autonomous runs will not close it.
+- W21 targets #9 (`uds-services-builder` polish) and #10 (classifier freeze, `scripts/classify_skill.py` + golden-file test) were never serviced — both carry to W22 PLAN. The classifier has now slipped 5+ consecutive runs; W22 Monday should give it the priority slot.
+- W22 PLAN should pull from calibration/mbse/sysml for domain spread and consider a symmetry pass on `autosar-adaptive-app-builder` (Classic↔Adaptive cross-reference is currently one-directional).
+- Sunday TRIAGE: label issue #11 ("packaging utility for Claude-compatible skill exports") — reads as tooling/ci.