Configuration Hardening 2

What changed:

  - Added visible runtime override reporting with masking for sensitive values.
  - Expanded effective config for build cleanup, script compiler discovery/env, extract layout/cleanup/
    HAK discovery, wiki deploy defaults, autogen cache policy, and release-source env names.
  - Wired configured values into build, script compiler resolution, extract, autogen cache refresh/max
    age, parts manifest release source, wiki generation/deploy, and TLK output naming.
  - Added config sources override output and validation-rule hints in config explain.
  - Added CONFIGURATION_HARDENING_AUDIT.md.
  - Updated README.md with config commands, schema defaults, and JSON artifact boundaries.
  - Added regression tests for override visibility/masking, compiler/extract/wiki/autogen config,
    configured HAK discovery, and config sources output.

internal/app/app.go

@@ -149,7 +149,7 @@ var commands = []command{
 	},
 	{
 		name:        "extract",
-		description: "Extract a module archive back into the src/ tree.",
+		description: "Extract built archives back into the configured source and asset trees.",
 		run:         runExtract,
 	},
 	{
@@ -169,7 +169,7 @@ var commands = []command{
 	},
 	{
 		name:        "apply-hak-manifest",
-		description: "Apply a generated HAK manifest to src/module/module.ifo.json.",
+		description: "Apply a generated HAK manifest to the configured module source.",
 		run:         runApplyHAKManifest,
 	},
 	{
@@ -749,6 +749,9 @@ func runConfig(ctx context) error {
 		if provenance.Deprecated {
 			fmt.Fprintf(ctx.stdout, "deprecated: true\n")
 		}
+		if rules := configValidationRules(key); len(rules) > 0 {
+			fmt.Fprintf(ctx.stdout, "validation: %s\n", strings.Join(rules, "; "))
+		}
 		return nil
 	case "sources":
 		if len(ctx.args) > 2 {
@@ -759,12 +762,42 @@ func runConfig(ctx context) error {
 		fmt.Fprintf(ctx.stdout, "format: %s\n", p.ConfigSource.Format)
 		fmt.Fprintf(ctx.stdout, "legacy: %t\n", p.ConfigSource.Legacy)
 		fmt.Fprintf(ctx.stdout, "candidates: %s\n", strings.Join(project.ConfigFileCandidates, ", "))
+		overrides := p.ActiveOverrides()
+		if len(overrides) == 0 {
+			fmt.Fprintln(ctx.stdout, "active overrides: none")
+			return nil
+		}
+		fmt.Fprintln(ctx.stdout, "active overrides:")
+		for _, override := range overrides {
+			fmt.Fprintf(ctx.stdout, "  %s=%s (%s)\n", override.Key, override.Value, override.Source)
+		}
 		return nil
 	default:
 		return fmt.Errorf("unknown config subcommand %q", ctx.args[1])
 	}
 }
 
+func configValidationRules(key string) []string {
+	switch {
+	case strings.HasPrefix(key, "paths."), strings.Contains(key, ".root"), strings.Contains(key, ".dir"), strings.Contains(key, ".cache"):
+		return []string{"relative paths must not escape the repository root unless explicitly documented"}
+	case strings.HasPrefix(key, "outputs."):
+		return []string{"generated output names must use the configured extension and must not escape the repository root"}
+	case key == "extract.layout":
+		return []string{"supported value: nwn_canonical_json"}
+	case key == "extract.hak_discovery":
+		return []string{"supported values: build_glob, configured_haks"}
+	case key == "autogen.cache.max_age":
+		return []string{"Go duration string, for example 1h or 30m"}
+	case strings.HasPrefix(key, "topdata.package_hak"):
+		return []string{"must be a .hak file name"}
+	case strings.HasPrefix(key, "topdata.package_tlk"), strings.HasPrefix(key, "topdata.compiled_tlk"):
+		return []string{"must be a .tlk file name"}
+	default:
+		return nil
+	}
+}
+
 func parseConfigFormatArgs(commandName string, args []string) (string, error) {
 	format := "yaml"
 	for _, arg := range args {