diff --git a/config/.markdownlint.jsonc b/config/.markdownlint.jsonc
new file mode 100644
index 0000000..c2fd5de
--- /dev/null
+++ b/config/.markdownlint.jsonc
@@ -0,0 +1,10 @@
+// Canonical ResQ markdownlint config — copy to a repo root as .markdownlint.jsonc.
+// Encodes docs/standards/02-languages.md (Markdown).
+{
+  "default": true,
+  "MD013": false, // line length — prose wraps; not a lint error
+  "MD033": false, // inline HTML — our READMEs use centered <div>/<img> heroes
+  "MD041": false, // first line need not be a heading (template opens with an HTML comment/banner)
+  "MD024": { "siblings_only": true }, // duplicate headings ok across sections
+  "MD029": { "style": "ordered" }
+}
diff --git a/config/README.md b/config/README.md
index ca7767d..c5098e0 100644
--- a/config/README.md
+++ b/config/README.md
@@ -16,6 +16,9 @@ settings — repos adopt them so "what does conformant look like" has one answer
 | [Ruff config](#python-ruff) (below) | Ruff (lint + format) | copy into `ruff.toml` / `pyproject.toml` |
 | [`rust/deny.toml`](./rust/deny.toml) | cargo-deny | copy to repo root |
 | [`yamllint.yml`](./yamllint.yml) | yamllint | copy as `.yamllint.yml` |
+| [`dotnet/Directory.Build.props`](./dotnet/Directory.Build.props) | MSBuild / Roslyn analyzers | drop at repo root (auto-imported) |
+| [`sql/.sqlfluff`](./sql/.sqlfluff) | SQLFluff | copy to repo root |
+| [`.markdownlint.jsonc`](./.markdownlint.jsonc) | markdownlint | copy to repo root |
 
 See [`docs/standards/02-languages.md`](../docs/standards/02-languages.md) for the
 per-language rules these encode, and the [standards index](../docs/standards/)
@@ -46,8 +49,10 @@ quote-style = "double"
 indent-style = "space"
 ```
 
-## Not yet templated
+## Adding a config
 
-C# (`.editorconfig` analyzer rules), SQL (`.sqlfluff`), and Markdown
-(`.markdownlint.jsonc`) are documented in the standards but not yet shipped as
-canonical files here — add them when the first repo of that kind needs one.
+The set now covers every language in the standards (TS, Python, C#, Rust,
+Shell-via-`.editorconfig`, SQL, YAML, Markdown). When a tool needs a canonical
+config, add the file here, document the rules it encodes in
+[`docs/standards/02-languages.md`](../docs/standards/02-languages.md), and list
+it in the table above.
diff --git a/config/dotnet/Directory.Build.props b/config/dotnet/Directory.Build.props
new file mode 100644
index 0000000..cb8bfe9
--- /dev/null
+++ b/config/dotnet/Directory.Build.props
@@ -0,0 +1,25 @@
+<!--
+  Canonical ResQ .NET build props. Encodes docs/standards/02-languages.md (C#).
+  Unlike the copy-only configs, Directory.Build.props is auto-imported by MSBuild
+  from the repo root — drop it in and every project inherits these. Merge into an
+  existing Directory.Build.props if one is already present.
+-->
+<Project>
+  <PropertyGroup>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <LangVersion>latest</LangVersion>
+
+    <!-- Built-in Roslyn (.NET) analyzers + code-style enforced at build. -->
+    <EnableNETAnalyzers>true</EnableNETAnalyzers>
+    <AnalysisLevel>latest-recommended</AnalysisLevel>
+    <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
+
+    <!-- Treat warnings as errors in CI; keep local dev builds loud-but-green. -->
+    <TreatWarningsAsErrors Condition="'$(CI)' == 'true'">true</TreatWarningsAsErrors>
+    <!-- XML docs are a per-project opt-in: enabling globally turns CS1591
+         (missing doc comment) into a CI-breaking error for app projects.
+         Libraries that publish an API set <GenerateDocumentationFile>true</…>
+         in their own .csproj. -->
+  </PropertyGroup>
+</Project>
diff --git a/config/sql/.sqlfluff b/config/sql/.sqlfluff
new file mode 100644
index 0000000..78f044e
--- /dev/null
+++ b/config/sql/.sqlfluff
@@ -0,0 +1,16 @@
+# Canonical ResQ SQLFluff config — copy to a repo root as .sqlfluff.
+# Encodes docs/standards/02-languages.md (SQL). Dialect = Postgres (Supabase).
+[sqlfluff]
+dialect = postgres
+templater = jinja
+max_line_length = 100
+
+[sqlfluff:indentation]
+indent_unit = space
+tab_space_size = 2
+
+[sqlfluff:rules:capitalisation.keywords]
+capitalisation_policy = lower
+
+[sqlfluff:rules:capitalisation.identifiers]
+extended_capitalisation_policy = lower