diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bec3e49..82479fb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,3 +27,14 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: ./coverage.out
           fail_ci_if_error: false
+
+  # The example (testdata/example) is a separate module with its own dependencies. It is checked
+  # but deliberately excluded from coverage, so it runs as its own job.
+  example:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: jdx/mise-action@v2
+        with:
+          cache: true
+      - run: mise run example
diff --git a/mise.toml b/mise.toml
index f80f915..588861b 100644
--- a/mise.toml
+++ b/mise.toml
@@ -37,3 +37,12 @@ run = 'go test -coverpkg=./... -covermode=atomic -coverprofile=coverage.out ./..
 [tasks.check]
 description = "Full gate: fmt, build, vet, lint, deadcode, test"
 depends = ["fmt", "build", "vet", "lint", "deadcode", "test"]
+
+# The example is a separate module (testdata/example, joined via go.work) with its own deps
+# (modernc.org/sqlite, samber/lo). It is checked but deliberately kept out of coverage, so it
+# runs as its own task/CI job rather than under `check`/`cover`. Formatting is already covered by
+# the root `fmt` task (gofmt -l . recurses into testdata/example).
+[tasks.example]
+description = "Check the example module (build, vet, lint, deadcode, test -race); no coverage"
+dir = "testdata/example"
+run = 'go build ./... && go vet ./... && golangci-lint run ./... && deadcode -test ./... && go test -race ./...'
diff --git a/e2e_test.go b/snapshot_test.go
similarity index 67%
rename from e2e_test.go
rename to snapshot_test.go
index 42901ed..5a4edc8 100644
--- a/e2e_test.go
+++ b/snapshot_test.go
@@ -12,21 +12,23 @@ import (
 	"github.com/mpyw/bisql/dialect"
 )
 
-// TestE2E exercises one comprehensive template that uses every directive kind at once — a CTE
-// bind, a recursive @include of reusable fragments, an if/elseif/else branch, an IN-list bind, a
-// PostgreSQL array bind, a tuple (row) IN, a /*%for*/ loop, an order-by conditional, and a /*^ */
-// inline literal — rendered across all four dialects to lock placeholder numbering.
+// TestSnapshots exercises one comprehensive template that uses every directive kind at once — a
+// CTE bind, a recursive @include of reusable fragments, an if/elseif/else branch, an IN-list
+// bind, a PostgreSQL array bind, a tuple (row) IN, a /*%for*/ loop, an order-by conditional, and
+// a /*^ */ inline literal — rendered across all four dialects to lock placeholder numbering.
 //
-// All fixtures are flat files under testdata/e2e, named by the template and (per case) the case:
+// The template and its fragments live under testdata/; every generated artifact lives under
+// testdata/snapshots/, named by the template and (per case) the case:
 //
-//	all_in_one.sql                  the template (@include-ing all_in_one.scope.sql, which in turn
-//	                                @include-s all_in_one.active.sql)
-//	all_in_one.expanded.sql         every @include resolved (dialect-independent)
-//	all_in_one.<case>.prepared.sql  parameterized SQL (placeholder form)
-//	all_in_one.<case>.embedded.sql  values-embedded SQL (when checked)
+//	testdata/all_in_one.sql                    the template (@include-s _all_in_one.scope.sql,
+//	                                           which in turn @include-s _all_in_one.active.sql)
+//	testdata/_all_in_one.{scope,active}.sql    reusable fragments (underscore-prefixed by convention)
+//	testdata/snapshots/all_in_one.expanded.sql every @include resolved (dialect-independent)
+//	testdata/snapshots/all_in_one.<case>.prepared.sql  parameterized SQL (placeholder form)
+//	testdata/snapshots/all_in_one.<case>.embedded.sql  values-embedded SQL (when checked)
 //
-// Regenerate with: go test -run TestE2E -update
-var update = flag.Bool("update", false, "update golden files in testdata/")
+// Regenerate with: go test -run TestSnapshots -update
+var update = flag.Bool("update", false, "update golden files in testdata/snapshots")
 
 func checkGolden(t *testing.T, path, got string) {
 	t.Helper()
@@ -38,23 +40,23 @@ func checkGolden(t *testing.T, path, got string) {
 	}
 	want, err := os.ReadFile(path)
 	if err != nil {
-		t.Fatalf("read golden %s: %v (regenerate with: go test -run TestE2E -update)", path, err)
+		t.Fatalf("read golden %s: %v (regenerate with: go test -run TestSnapshots -update)", path, err)
 	}
 	if got != string(want) {
 		t.Errorf("%s mismatch\n--- got ---\n%s\n--- want ---\n%s", path, got, want)
 	}
 }
 
-func TestE2E(t *testing.T) {
-	const dir = "testdata/e2e"
-	fsys := os.DirFS(dir)
+func TestSnapshots(t *testing.T) {
+	fsys := os.DirFS("testdata")
+	snap := func(name string) string { return filepath.Join("testdata", "snapshots", name) }
 
 	// Expanded snapshot: every @include resolved, still two-way, independent of dialect.
 	expanded, err := bisql.ExpandFile(fsys, "all_in_one.sql")
 	if err != nil {
 		t.Fatalf("expand: %v", err)
 	}
-	checkGolden(t, filepath.Join(dir, "all_in_one.expanded.sql"), expanded)
+	checkGolden(t, snap("all_in_one.expanded.sql"), expanded)
 
 	// The full case supplies every optional predicate; rendered under all four dialects it locks
 	// the placeholder numbering. pg_array adds the PostgreSQL-only array bind; the pending/else
@@ -109,9 +111,9 @@ func TestE2E(t *testing.T) {
 			if !reflect.DeepEqual(stmt.Args, c.args) {
 				t.Errorf("Args\n got: %#v\nwant: %#v", stmt.Args, c.args)
 			}
-			checkGolden(t, filepath.Join(dir, "all_in_one."+c.name+".prepared.sql"), stmt.SQL)
+			checkGolden(t, snap("all_in_one."+c.name+".prepared.sql"), stmt.SQL)
 			if c.embedded {
-				checkGolden(t, filepath.Join(dir, "all_in_one."+c.name+".embedded.sql"), stmt.SQLWithArgs())
+				checkGolden(t, snap("all_in_one."+c.name+".embedded.sql"), stmt.SQLWithArgs())
 			}
 		})
 	}
diff --git a/testdata/e2e/all_in_one.active.sql b/testdata/_all_in_one.active.sql
similarity index 100%
rename from testdata/e2e/all_in_one.active.sql
rename to testdata/_all_in_one.active.sql
diff --git a/testdata/e2e/all_in_one.scope.sql b/testdata/_all_in_one.scope.sql
similarity index 65%
rename from testdata/e2e/all_in_one.scope.sql
rename to testdata/_all_in_one.scope.sql
index 1031593..1b7d9fe 100644
--- a/testdata/e2e/all_in_one.scope.sql
+++ b/testdata/_all_in_one.scope.sql
@@ -1,2 +1,2 @@
-/*%! @include all_in_one.active.sql */
+/*%! @include _all_in_one.active.sql */
 /*%if departmentId != null*/and u.department_id = /*departmentId*/0/*%end*/
diff --git a/testdata/e2e/all_in_one.sql b/testdata/all_in_one.sql
similarity index 93%
rename from testdata/e2e/all_in_one.sql
rename to testdata/all_in_one.sql
index 559f833..7a67817 100644
--- a/testdata/e2e/all_in_one.sql
+++ b/testdata/all_in_one.sql
@@ -5,7 +5,7 @@ select u.id, u.name
 from users u
 join active_depts d on d.id = u.department_id
 where 1 = 1
-/*%! @include all_in_one.scope.sql */
+/*%! @include _all_in_one.scope.sql */
 /*%if ageBand == 'adult'*/ and u.age >= 18/*%elseif ageBand == 'senior'*/ and u.age >= 65/*%else*/ and u.age >= 0/*%end*/
 /*%if ids != null*/and u.id in /*ids*/(0)/*%end*/
 /*%if tags != null*/and u.tags && /*tags*/'{}'::text[]/*%end*/
diff --git a/testdata/example/src/app/infrastructure/query/query.go b/testdata/example/src/app/infrastructure/query/query.go
index be53373..24a5fee 100644
--- a/testdata/example/src/app/infrastructure/query/query.go
+++ b/testdata/example/src/app/infrastructure/query/query.go
@@ -1,6 +1,7 @@
 // Package query implements the app/query ports over a *sql.DB, building each statement from the
 // embedded bisql templates (SQLite dialect). The .sql templates live under sql/, organized by
-// domain, with reusable fragments under a fragment/ subdirectory pulled in via @include.
+// domain; reusable fragments are underscore-prefixed (_name.sql) by convention and pulled in via
+// @include. The embed uses the all: prefix so those _-prefixed files are included.
 package query
 
 import (
@@ -16,7 +17,7 @@ import (
 	port "github.com/mpyw/bisql/example/src/app/query"
 )
 
-//go:embed sql
+//go:embed all:sql
 var embedded embed.FS
 
 // templates is the query tree rooted at sql/, so a name like "users/search.sql" resolves and its
diff --git a/testdata/example/src/app/infrastructure/query/sql/audit_logs/fragment/since.sql b/testdata/example/src/app/infrastructure/query/sql/audit_logs/_since.sql
similarity index 100%
rename from testdata/example/src/app/infrastructure/query/sql/audit_logs/fragment/since.sql
rename to testdata/example/src/app/infrastructure/query/sql/audit_logs/_since.sql
diff --git a/testdata/example/src/app/infrastructure/query/sql/audit_logs/fragment/window.sql b/testdata/example/src/app/infrastructure/query/sql/audit_logs/_window.sql
similarity index 59%
rename from testdata/example/src/app/infrastructure/query/sql/audit_logs/fragment/window.sql
rename to testdata/example/src/app/infrastructure/query/sql/audit_logs/_window.sql
index b28530d..f3da1db 100644
--- a/testdata/example/src/app/infrastructure/query/sql/audit_logs/fragment/window.sql
+++ b/testdata/example/src/app/infrastructure/query/sql/audit_logs/_window.sql
@@ -1,2 +1,2 @@
-/*%! @include audit_logs/fragment/since.sql */
+/*%! @include audit_logs/_since.sql */
 /*%if until != null*/and a.created_at < /*until*/'2026-01-01'/*%end*/
diff --git a/testdata/example/src/app/infrastructure/query/sql/audit_logs/activity-report.sql b/testdata/example/src/app/infrastructure/query/sql/audit_logs/activity-report.sql
index 6551558..c1b8d14 100644
--- a/testdata/example/src/app/infrastructure/query/sql/audit_logs/activity-report.sql
+++ b/testdata/example/src/app/infrastructure/query/sql/audit_logs/activity-report.sql
@@ -11,7 +11,7 @@ from audit_logs a
 join users u on u.id = a.user_id
 join departments d on d.id = u.department_id
 where 1 = 1
-/*%! @include audit_logs/fragment/window.sql */
+/*%! @include audit_logs/_window.sql */
 /*%if actions != null*/and a.action in /*actions*/('login')/*%end*/
 group by d.name
 order by events desc, d.name
diff --git a/testdata/example/src/app/infrastructure/query/sql/users/fragment/active.sql b/testdata/example/src/app/infrastructure/query/sql/users/_active.sql
similarity index 100%
rename from testdata/example/src/app/infrastructure/query/sql/users/fragment/active.sql
rename to testdata/example/src/app/infrastructure/query/sql/users/_active.sql
diff --git a/testdata/example/src/app/infrastructure/query/sql/users/fragment/scope.sql b/testdata/example/src/app/infrastructure/query/sql/users/_scope.sql
similarity index 88%
rename from testdata/example/src/app/infrastructure/query/sql/users/fragment/scope.sql
rename to testdata/example/src/app/infrastructure/query/sql/users/_scope.sql
index 1b56b33..81f8f60 100644
--- a/testdata/example/src/app/infrastructure/query/sql/users/fragment/scope.sql
+++ b/testdata/example/src/app/infrastructure/query/sql/users/_scope.sql
@@ -1,5 +1,5 @@
 -- Row-visibility scope shared by every users query: an optional active-only filter (its own
 -- reusable fragment) and an optional single-department filter. Both are conjunctions, so the
 -- scope contributes nothing when neither is requested.
-/*%! @include users/fragment/active.sql */
+/*%! @include users/_active.sql */
 /*%if departmentId != null*/and u.department_id = /*departmentId*/0/*%end*/
diff --git a/testdata/example/src/app/infrastructure/query/sql/users/search.sql b/testdata/example/src/app/infrastructure/query/sql/users/search.sql
index d794500..a2e3b04 100644
--- a/testdata/example/src/app/infrastructure/query/sql/users/search.sql
+++ b/testdata/example/src/app/infrastructure/query/sql/users/search.sql
@@ -22,7 +22,7 @@ select
 from users u
 /*%if withDepartment*/join departments d on d.id = u.department_id/*%end*/
 where 1 = 1
-/*%! @include users/fragment/scope.sql */
+/*%! @include users/_scope.sql */
 /*%if ageBand == 'adult'*/ and u.age >= 18/*%elseif ageBand == 'senior'*/ and u.age >= 65/*%else*/ and u.age >= 0/*%end*/
 /*%if q != null*/and u.name like /*q*/'%alice%'/*%end*/
 /*%if departmentIds != null*/and u.department_id in /*departmentIds*/(0)/*%end*/
diff --git a/testdata/e2e/all_in_one.expanded.sql b/testdata/snapshots/all_in_one.expanded.sql
similarity index 100%
rename from testdata/e2e/all_in_one.expanded.sql
rename to testdata/snapshots/all_in_one.expanded.sql
diff --git a/testdata/e2e/all_in_one.mysql_full.embedded.sql b/testdata/snapshots/all_in_one.mysql_full.embedded.sql
similarity index 100%
rename from testdata/e2e/all_in_one.mysql_full.embedded.sql
rename to testdata/snapshots/all_in_one.mysql_full.embedded.sql
diff --git a/testdata/e2e/all_in_one.mysql_full.prepared.sql b/testdata/snapshots/all_in_one.mysql_full.prepared.sql
similarity index 100%
rename from testdata/e2e/all_in_one.mysql_full.prepared.sql
rename to testdata/snapshots/all_in_one.mysql_full.prepared.sql
diff --git a/testdata/e2e/all_in_one.mysql_pending.embedded.sql b/testdata/snapshots/all_in_one.mysql_pending.embedded.sql
similarity index 100%
rename from testdata/e2e/all_in_one.mysql_pending.embedded.sql
rename to testdata/snapshots/all_in_one.mysql_pending.embedded.sql
diff --git a/testdata/e2e/all_in_one.mysql_pending.prepared.sql b/testdata/snapshots/all_in_one.mysql_pending.prepared.sql
similarity index 100%
rename from testdata/e2e/all_in_one.mysql_pending.prepared.sql
rename to testdata/snapshots/all_in_one.mysql_pending.prepared.sql
diff --git a/testdata/e2e/all_in_one.oracle_full.prepared.sql b/testdata/snapshots/all_in_one.oracle_full.prepared.sql
similarity index 100%
rename from testdata/e2e/all_in_one.oracle_full.prepared.sql
rename to testdata/snapshots/all_in_one.oracle_full.prepared.sql
diff --git a/testdata/e2e/all_in_one.pg_array.embedded.sql b/testdata/snapshots/all_in_one.pg_array.embedded.sql
similarity index 100%
rename from testdata/e2e/all_in_one.pg_array.embedded.sql
rename to testdata/snapshots/all_in_one.pg_array.embedded.sql
diff --git a/testdata/e2e/all_in_one.pg_array.prepared.sql b/testdata/snapshots/all_in_one.pg_array.prepared.sql
similarity index 100%
rename from testdata/e2e/all_in_one.pg_array.prepared.sql
rename to testdata/snapshots/all_in_one.pg_array.prepared.sql
diff --git a/testdata/e2e/all_in_one.pg_else.prepared.sql b/testdata/snapshots/all_in_one.pg_else.prepared.sql
similarity index 100%
rename from testdata/e2e/all_in_one.pg_else.prepared.sql
rename to testdata/snapshots/all_in_one.pg_else.prepared.sql
diff --git a/testdata/e2e/all_in_one.postgres_full.embedded.sql b/testdata/snapshots/all_in_one.postgres_full.embedded.sql
similarity index 100%
rename from testdata/e2e/all_in_one.postgres_full.embedded.sql
rename to testdata/snapshots/all_in_one.postgres_full.embedded.sql
diff --git a/testdata/e2e/all_in_one.postgres_full.prepared.sql b/testdata/snapshots/all_in_one.postgres_full.prepared.sql
similarity index 100%
rename from testdata/e2e/all_in_one.postgres_full.prepared.sql
rename to testdata/snapshots/all_in_one.postgres_full.prepared.sql
diff --git a/testdata/e2e/all_in_one.sqlserver_full.prepared.sql b/testdata/snapshots/all_in_one.sqlserver_full.prepared.sql
similarity index 100%
rename from testdata/e2e/all_in_one.sqlserver_full.prepared.sql
rename to testdata/snapshots/all_in_one.sqlserver_full.prepared.sql