diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,46 @@
 
 ---
 
+## [0.17.3] - 2026-08-01
+
+Point release on the 0.17.x line, focused on **release-artifact integrity**. The 0.17.2 release shipped
+two defects that every existing check missed because they validated only the generated `dist/` tree, never
+the packaged artifact: the `hydra-build` sdist shipped 3 of 8 modules, and the published Java `hydra-kernel`
+jar was a whole [#417](https://github.com/CategoricalData/hydra/issues/417) rename behind. This release adds
+an artifact-level publish-completeness gate that inspects the actual uploaded archive, closing that class of
+defect across all five registries.
+
+### Highlights
+
+- **Artifact-content completeness gate** ([#621](https://github.com/CategoricalData/hydra/issues/621)):
+  every publish path (Hackage sdist, Maven-Java jar, Maven-Scala jar, PyPI wheel, npm tarball) now inspects
+  the *packaged* archive and hard-fails if any module a package's manifest declares is missing. The gate also
+  asserts the post-#417 class names are present in the Java kernel jar.
+
+### Bug fixes
+
+- **PyPI wheels dropped non-`hydra.*` roots** ([#621](https://github.com/CategoricalData/hydra/issues/621)):
+  the wheel packaging hardcoded `packages = ["src/main/python/hydra"]`, silently omitting `hydra-pg`'s
+  `com.gdblab.*` and `openGql.*` modules. The generator now ships every emitted top-level root.
+
+### Improvements
+
+- **CI guard for dist-tree completeness** ([#524](https://github.com/CategoricalData/hydra/issues/524)):
+  asserts every manifest `mainModules` namespace is emitted into `dist/haskell`, catching the 0.17.2
+  `hydra-build` truncation at the tree level (the artifact gate is the packaged-archive counterpart).
+- **Manifest generation extracted** into `Hydra.ManifestGeneration`, and the structurally-unneeded #607
+  sed shims dropped ([#622](https://github.com/CategoricalData/hydra/issues/622)).
+- **Release-verification signing fix** ([#441](https://github.com/CategoricalData/hydra/issues/441)):
+  sign the reproducible uncompressed `.tar` and verify the `.asc` against the GitHub Release asset.
+- **Java CI signing gate** ([#591](https://github.com/CategoricalData/hydra/issues/591)): `publishToMavenLocal`
+  skips gpg signing when no key is present.
+
+### Internal
+
+- Version bump to 0.17.3; `hostVersion` advanced to 0.17.2 and the temporary #417 Java/Python local-host
+  shims removed now that 0.17.2 is published on the registries
+  ([#417](https://github.com/CategoricalData/hydra/issues/417)).
+
 ## [0.17.2] - 2026-07-28
 
 Point release on the 0.17.x line. Themes: promotion of the generator's routing and manifest
diff --git a/hydra-haskell.cabal b/hydra-haskell.cabal
--- a/hydra-haskell.cabal
+++ b/hydra-haskell.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           hydra-haskell
-version:        0.17.3
+version:        0.17.4
 synopsis:       Hydra's Haskell coder: emit Haskell source from Hydra modules
 description:    Hydra is an implementation of the LambdaGraph data model, which takes advantage of an isomorphism between labeled hypergraphs and typed lambda calculus: in Hydra, "graphs are programs, and programs are graphs". This package is Hydra's Haskell coder: it translates Hydra modules into Haskell source. The top-level entry point is moduleToHaskell (and moduleToHaskellModule for the structured AST). It builds on hydra-kernel.
 category:       Data
@@ -44,6 +44,6 @@
   build-depends:
       base >=4.19.0 && <4.22
     , containers >=0.6.7 && <0.8
-    , hydra-kernel ==0.17.3
+    , hydra-kernel ==0.17.4
     , scientific >=0.3.7 && <0.4
   default-language: Haskell2010
diff --git a/src/main/haskell/Hydra/Haskell/Coder.hs b/src/main/haskell/Hydra/Haskell/Coder.hs
--- a/src/main/haskell/Hydra/Haskell/Coder.hs
+++ b/src/main/haskell/Hydra/Haskell/Coder.hs
@@ -95,17 +95,18 @@
 constantForTypeName tname = Strings.concat2 "_" (Names.localNameOf tname)
 
 -- | Construct a Haskell module from a Hydra module and its definitions
-constructModule :: Util.ModuleNames Syntax.ModuleName -> Packaging.Module -> [Packaging.Definition] -> t0 -> Graph.Graph -> Either Errors.Error Syntax.Module
-constructModule namespaces mod defs cx g =
+constructModule :: S.Set String -> Util.ModuleNames Syntax.ModuleName -> Packaging.Module -> [Packaging.Definition] -> t0 -> Graph.Graph -> Either Errors.Error Syntax.Module
+constructModule overlaySubs namespaces mod defs cx g =
 
       let hRaw = \namespace -> Packaging.unModuleName namespace
           h =
                   \namespace ->
                     let raw = Packaging.unModuleName namespace
                         parts = Strings.splitOn "." raw
-                    in (Logic.ifElse (Logic.and (Equality.equal (Lists.length parts) 3) (Equality.equal (Lists.take 2 parts) [
+                        sub = Strings.join "." (Lists.drop 2 parts)
+                    in (Logic.ifElse (Logic.and (Logic.and (Equality.equal (Lists.length parts) 3) (Equality.equal (Lists.take 2 parts) [
                       "hydra",
-                      "lib"])) (Strings.concat2 "hydra.overlay.haskell.lib." (Strings.join "." (Lists.drop 2 parts))) raw)
+                      "lib"])) (Sets.member sub overlaySubs)) (Strings.concat2 "hydra.overlay.haskell.lib." sub) raw)
           createDeclarations =
                   \def -> case def of
                     Packaging.DefinitionType v0 ->
@@ -584,17 +585,17 @@
 keyHaskellVar = Core.Name "haskellVar"
 
 -- | Convert a Hydra module to Haskell source code as a filepath-to-content map
-moduleToHaskell :: Packaging.Module -> [Packaging.Definition] -> t0 -> Graph.Graph -> Either Errors.Error (M.Map String String)
-moduleToHaskell mod defs cx g =
-    Eithers.bind (moduleToHaskellModule mod defs cx g) (\hsmod ->
+moduleToHaskell :: S.Set String -> Packaging.Module -> [Packaging.Definition] -> t0 -> Graph.Graph -> Either Errors.Error (M.Map String String)
+moduleToHaskell overlaySubs mod defs cx g =
+    Eithers.bind (moduleToHaskellModule overlaySubs mod defs cx g) (\hsmod ->
       let s = Serialization.printExpr (Serialization.parenthesize (Serde.moduleToExpr hsmod))
           filepath = Names.moduleNameToFilePath Util.CaseConventionPascal (File.FileExtension "hs") (Packaging.moduleName mod)
       in (Right (Maps.singleton filepath s)))
 
 -- | Convert a Hydra module and definitions to a Haskell module AST
-moduleToHaskellModule :: Packaging.Module -> [Packaging.Definition] -> t0 -> Graph.Graph -> Either Errors.Error Syntax.Module
-moduleToHaskellModule mod defs cx g =
-    Eithers.bind (Utils.namespacesForModule mod cx g) (\namespaces -> constructModule namespaces mod defs cx g)
+moduleToHaskellModule :: S.Set String -> Packaging.Module -> [Packaging.Definition] -> t0 -> Graph.Graph -> Either Errors.Error Syntax.Module
+moduleToHaskellModule overlaySubs mod defs cx g =
+    Eithers.bind (Utils.namespacesForModule mod cx g) (\namespaces -> constructModule overlaySubs namespaces mod defs cx g)
 
 -- | Generate Haskell declarations for type and field name constants
 nameDecls :: Util.ModuleNames Syntax.ModuleName -> Core.Name -> Core.Type -> [Syntax.Declaration]