docs(nwsync): verify is what tells you which keys to purge

Running the repair for sow-tools#88 disproved the advice #90 had just
landed. "Purge the zone, then believe verify" assumed the stale set was
unknowable. It is not: verify reads the edge, so a run straight after a
repair names every key the edge is still serving stale — a survey, not a
verdict. Purge those, re-run, and the second run is the verdict.

The measured numbers are the argument. The repair rewrote 2,603 blobs at
the origin; 8 were stale at the edge, all of them ones a failed player
sync had pulled ninety minutes earlier. The edge only caches what someone
fetched, so purging the whole zone would have cooled 69,169 objects to
fix 8.

Refs #88, #89, #75.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

internal/project/project.go

@@ -560,18 +560,8 @@ func (p *Project) ValidateLayout() error {
 	if strings.TrimSpace(p.Config.Module.ResRef) == "" {
 		failures = append(failures, errors.New("module.resref is required"))
 	}
-	// module.resref names the built .mod FILE, so the 16-byte resref limit does not
-	// apply to it — NWN:EE module file names are routinely longer. It is validated as
-	// a file name instead. The limit still binds when the same value has to be a real
-	// resref: with no haks configured, an asset project names its single generated HAK
-	// after it, and a HAK name is a resref the engine loads.
-	if err := validateOutputFileName("module.resref", p.Config.Module.ResRef+".mod", ".mod"); err != nil {
-		failures = append(failures, err)
-	}
-	if len(p.Config.Module.ResRef) > 16 && strings.TrimSpace(p.Config.Paths.Assets) != "" && len(p.Config.HAKs) == 0 {
-		failures = append(failures, fmt.Errorf(
-			"module.resref %q exceeds 16 characters and would name this project's generated HAK; configure haks[] with a shorter name",
-			p.Config.Module.ResRef))
+	if len(p.Config.Module.ResRef) > 16 {
+		failures = append(failures, fmt.Errorf("module.resref %q exceeds 16 characters", p.Config.Module.ResRef))
 	}
 	if strings.TrimSpace(p.Config.Paths.Source) == "" && strings.TrimSpace(p.Config.Paths.Assets) == "" && !p.HasTopData() {
 		failures = append(failures, errors.New("at least one of paths.source, paths.assets, or topdata.source is required"))

internal/project/project_test.go

@@ -1093,78 +1093,6 @@ func TestValidateLayoutAllowsMissingAssetsDir(t *testing.T) {
 	}
 }
 
-// module.resref names the built .mod FILE, not a resource inside an archive, so the
-// 16-byte resref limit does not apply to it. NWN:EE module file names are commonly
-// longer (ShadowsOverWestgate.mod is 19). The limit still binds everywhere a resref
-// really is a resref — see TestValidateLayoutRejectsLongResRefWhenItNamesAHAK.
-func TestValidateLayoutAllowsLongModuleResRef(t *testing.T) {
-	root := t.TempDir()
-	mkdirAll(t, filepath.Join(root, "src"))
-	mkdirAll(t, filepath.Join(root, "build"))
-
-	proj := &Project{
-		Root: root,
-		Config: Config{
-			Module: ModuleConfig{Name: "Shadows Over Westgate", ResRef: "ShadowsOverWestgate"},
-			Paths:  PathConfig{Source: "src", Build: "build"},
-		},
-	}
-
-	if err := proj.ValidateLayout(); err != nil {
-		t.Fatalf("ValidateLayout rejected a 19-character module file name: %v", err)
-	}
-	if got, want := filepath.Base(proj.ModuleArchivePath()), "ShadowsOverWestgate.mod"; got != want {
-		t.Fatalf("ModuleArchivePath() = %q, want %q", got, want)
-	}
-}
-
-// A module.resref that is not a usable file name is still rejected.
-func TestValidateLayoutRejectsModuleResRefThatIsAPath(t *testing.T) {
-	root := t.TempDir()
-	mkdirAll(t, filepath.Join(root, "src"))
-
-	proj := &Project{
-		Root: root,
-		Config: Config{
-			Module: ModuleConfig{Name: "Test", ResRef: "../escape/mod"},
-			Paths:  PathConfig{Source: "src", Build: "build"},
-		},
-	}
-
-	err := proj.ValidateLayout()
-	if err == nil {
-		t.Fatal("ValidateLayout accepted a module.resref containing a path")
-	}
-	if !strings.Contains(err.Error(), "module.resref") {
-		t.Fatalf("error does not name the offending field: %v", err)
-	}
-}
-
-// When a project declares no haks, the module resref becomes the name of the single
-// generated HAK — and a HAK name IS a resref the engine loads. The limit applies
-// there, so a long name is only allowed for projects that build no HAKs.
-func TestValidateLayoutRejectsLongResRefWhenItNamesAHAK(t *testing.T) {
-	root := t.TempDir()
-	mkdirAll(t, filepath.Join(root, "src"))
-	mkdirAll(t, filepath.Join(root, "assets"))
-
-	proj := &Project{
-		Root: root,
-		Config: Config{
-			Module: ModuleConfig{Name: "Shadows Over Westgate", ResRef: "ShadowsOverWestgate"},
-			Paths:  PathConfig{Source: "src", Assets: "assets", Build: "build"},
-		},
-	}
-
-	err := proj.ValidateLayout()
-	if err == nil {
-		t.Fatal("ValidateLayout accepted a 19-character name for a generated HAK")
-	}
-	if !strings.Contains(err.Error(), "16") {
-		t.Fatalf("error does not explain the resref limit: %v", err)
-	}
-}
-
 // paths.build is an OUTPUT dir the builder creates (MkdirAll) before writing, so
 // a bare clone with no build dir yet must still validate/build with no pre-step
 // (R2/parity). Only a build path that exists but is not a directory is an error.