diff --git a/CHANGELOG.md b/CHANGELOG.md
index f61bed6..8fc6bbc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- boundary-exception: close out v0.5.0 GitHub, crates.io, PyPI, and npm publication against frozen
+  core-A/B evidence and published artifact hashes; no Windows artifact or expanded public claims.
 - boundary-exception: reconcile v0.5.0 release-boundary CI metadata and DCO sign-offs for the
   reviewed release implementation; no new public support boundary is opened.
 - ci: index the v0.4.0 validation closeout and bind it to the existing source commit, and align
diff --git a/docs/validation/README.md b/docs/validation/README.md
index 43db180..f44dc5b 100644
--- a/docs/validation/README.md
+++ b/docs/validation/README.md
@@ -5,4 +5,5 @@ summary. Completed per-lane historical validation records were retired.
 
 - [v0.3.0 release closeout summary](v0-3-0-release-closeout-summary.md)
 - [v0.4.0 release closeout summary](v0-4-0-release-closeout-summary.md)
+- [v0.5.0 release closeout summary](v0-5-0-release-closeout-summary.md)
 - [NIP-5.2 ethos-full build evidence](nip-5-2-ethos-full-build-evidence-2026-07-20.md)
diff --git a/docs/validation/v0-5-0-release-closeout-summary.md b/docs/validation/v0-5-0-release-closeout-summary.md
new file mode 100644
index 0000000..f3bbc1b
--- /dev/null
+++ b/docs/validation/v0-5-0-release-closeout-summary.md
@@ -0,0 +1,29 @@
+# Ethos v0.5.0 Release Closeout Summary
+
+Status: closed on 2026-07-21.
+
+Validated source HEAD before this record: `bfb71970b65826c1826097d0a7bccd6bf2059e2d`.
+Core-A evidence was bound to commit `77a62e3d18fdf1a6791c79e48892ab5671d13c8d`; npm B was
+prepared from that frozen core and committed in core-B HEAD above. Both commits carry DCO
+sign-offs.
+
+GitHub Release [v0.5.0](https://github.com/docushell/ethos/releases/tag/v0.5.0) is live,
+non-draft, and non-prerelease. Its annotated tag dereferences to core-B HEAD. It contains the
+macOS arm64 and Linux x64 caller-PDFium CLI archives and the optional `ethos-full` archives,
+with checksum, inventory, and target-smoke sidecars. No Windows artifact was published.
+
+Published archive SHA-256 values:
+
+- `ethos-macos-arm64.tar.gz`: `30fa34afda745d168e1af39a134e2281f4a409d425765f3dc85c2e312fcbbcc2`;
+- `ethos-linux-x64.tar.gz`: `592b175c00d147625f2f2ccc8bc5c74fb8a00ee37f178c363757f2c72404876e`;
+- `ethos-full-0.5.0-macos-arm64.tar.gz`: `3ac08c2c32a1d08e4481cdeeb2b7a8b5780e9b0c09ebc40da9cbd59d4c2a4795`;
+- `ethos-full-0.5.0-linux-x64.tar.gz`: `8608c3e5c7a51bed45d6ead7a717d59e226f27839ad8aab2fde384a46db425b1`.
+
+The Rust crates `ethos-doc-core`, `ethos-verify`, and `ethos-pdf` are live on crates.io at
+`0.5.0`; the Python `ethos-pdf` wheel is live on PyPI at `0.5.0`; and
+`@docushell/ethos-pdf@0.5.0` is live on npm. Release-prep, deterministic-build, target-smoke,
+performance, claims, licence, package, and consumer validation gates passed before publication.
+
+The release retains the caller-provided PDFium boundary for base archives. Public benchmark,
+speed, footprint, parser-quality, table-quality, hosted, production, and Windows packaged
+claims remain outside the approved release boundary.