diff --git a/README.md b/README.md
index 01eda9d..1417f1c 100644
--- a/README.md
+++ b/README.md
@@ -22,13 +22,13 @@ One command. One report. One exit code.
 
 ---
 
-**ApiGate** is the fourth surface in the Stelnyx line ([LuxScope](https://github.com/Stelnyx/LuxScope), [LuxFaber](https://github.com/Stelnyx/LuxFaber), [SecGate](https://github.com/Stelnyx/SecGate), **ApiGate**). It reads source code and OpenAPI specs on disk and produces one report: every endpoint, its declared auth posture, the drift between code and spec, scored against five 0–100 rubrics. **100% static** — no HTTP requests, no credentials, no running server. Zero network calls. Same input → byte-identical output.
+**ApiGate** is part of the Stelnyx developer-tool family alongside [LuxScope](https://github.com/Stelnyx/LuxScope), [LuxFaber](https://github.com/Stelnyx/LuxFaber), and [SecGate](https://github.com/Stelnyx/SecGate). It reads source code and OpenAPI specs on disk and produces one report: every endpoint it can detect, its declared auth posture, code/spec drift, and five transparent 0–100 rubrics. **100% static** — no HTTP requests, credentials, or running server. Zero network calls. With a fixed report timestamp, the same input and configuration produce byte-identical output.
 
 **Honest positioning.** ApiGate is a **surface auditor**, not a runtime scanner and not a DAST tool. The report explicitly states what a static analysis CAN and CANNOT prove — it's a printed trust feature, not a footnote. ApiGate cannot verify runtime authorization (BOLA / object-level access). It can prove that an endpoint declares a guard. It cannot prove the guard is correct. See [What this does NOT prove](#what-this-does-not-prove).
 
 **Status.** Early release (`v0.3.3`). Releases publish from GitHub Actions with npm trusted publishing and provenance. Report vulnerabilities via [SECURITY.md](SECURITY.md).
 
-**Accuracy contract.** ApiGate's parsing + scoring pipeline is deterministic — same inputs produce JSON- and HTML-byte-identical reports across every run. Three test suites lock the contract:
+**Accuracy contract.** ApiGate's parsing + scoring pipeline is deterministic. With the same files, configuration, tool version, and report timestamp, it produces JSON- and HTML-byte-identical reports. Three test suites lock the contract:
 
 - `test/determinism.mjs` — byte-equality of JSON and HTML across reruns of every parser, classifier, diff, score, and renderer call.
 - `test/golden-apigate.mjs` — hand-crafted multi-framework fixture; expected endpoint count, posture distribution, drift buckets, and headline score are inline so any change surfaces in code review.
@@ -84,6 +84,8 @@ ApiGate walks source files in a directory and produces:
 
 ApiGate does not run code. It does not send HTTP requests. It does not require credentials or a running server. Everything happens at parse-time against source files.
 
+The bounded scan builds one sorted candidate-file index and shares it across all enabled parsers. File limits, default vendor/build exclusions, symlink skipping, depth limits, and progress reporting therefore apply once per scan rather than once per framework.
+
 ---
 
 ## Frameworks
@@ -540,7 +542,7 @@ If your codebase wants to drop the false signal entirely, remove `ApiBearerAuth`
 
 ## Design parity
 
-ApiGate is visually + structurally indistinguishable from SecGate, LuxScope, and LuxFaber. The HTML report is rendered through `@stelnyx/report-theme@^0.1.0` — the same version, same imports, same shell envelope, no fork, no local restyle. See [DESIGN_PARITY.md](DESIGN_PARITY.md) for the contract.
+ApiGate shares the same report shell, navigation, typography, and design tokens as SecGate, LuxScope, and LuxFaber. The HTML report is rendered through `@stelnyx/report-theme@^0.1.4` with no fork or parallel document shell. See [DESIGN_PARITY.md](DESIGN_PARITY.md) for the contract.
 
 If a missing theme component blocks ApiGate, the resolution is an upstream PR to `report-theme`, not a local patch. That's how the four-tool shelf stays one product.
 
diff --git a/lib/inventory.mjs b/lib/inventory.mjs
index c27ab45..1505760 100644
--- a/lib/inventory.mjs
+++ b/lib/inventory.mjs
@@ -2,7 +2,9 @@ import { parseExpress } from "./parsers/express.mjs";
 import { parseFastify } from "./parsers/fastify.mjs";
 import { parseNest } from "./parsers/nest.mjs";
 import { parseOpenApi } from "./parsers/openapi.mjs";
-import { sortEndpoints } from "./utils.mjs";
+import { sortEndpoints, walkFiles } from "./utils.mjs";
+
+const CANDIDATE_EXTENSIONS = [".js", ".mjs", ".cjs", ".ts", ".tsx", ".yaml", ".yml", ".json"];
 
 /**
  * Orchestrate parsers, dedup by (framework, method, path, file, line),
@@ -22,26 +24,31 @@ export function buildInventory(targetDir, config) {
   const frameworksDetected = new Set();
   let specsDetected = [];
 
+  // One bounded, deterministic walk is shared by every enabled parser. Parser
+  // entrypoints still walk independently when called directly, preserving the
+  // public API used by consumers and focused parser tests.
+  const candidateFiles = walkFiles(targetDir, CANDIDATE_EXTENSIONS, excl, scan);
+
   if (fw.express) {
-    const r = parseExpress(targetDir, excl, scan);
+    const r = parseExpress(targetDir, excl, scan, candidateFiles);
     if (r.endpoints.length) frameworksDetected.add("express");
     code.push(...r.endpoints);
     warnings.push(...r.warnings);
   }
   if (fw.fastify) {
-    const r = parseFastify(targetDir, excl, scan);
+    const r = parseFastify(targetDir, excl, scan, candidateFiles);
     if (r.endpoints.length) frameworksDetected.add("fastify");
     code.push(...r.endpoints);
     warnings.push(...r.warnings);
   }
   if (fw.nest) {
-    const r = parseNest(targetDir, excl, scan);
+    const r = parseNest(targetDir, excl, scan, candidateFiles);
     if (r.endpoints.length) frameworksDetected.add("nest");
     code.push(...r.endpoints);
     warnings.push(...r.warnings);
   }
   if (fw.openapi) {
-    const r = parseOpenApi(targetDir, excl, scan);
+    const r = parseOpenApi(targetDir, excl, scan, candidateFiles);
     if (r.endpoints.length) frameworksDetected.add("openapi");
     spec.push(...r.endpoints);
     warnings.push(...r.warnings);
diff --git a/lib/parsers/express.mjs b/lib/parsers/express.mjs
index 8843879..037f3e1 100644
--- a/lib/parsers/express.mjs
+++ b/lib/parsers/express.mjs
@@ -1,7 +1,7 @@
 import path from "path";
 import * as acorn from "acorn";
 import * as walk from "acorn-walk";
-import { readTextFile, walkFiles, relPath } from "../utils.mjs";
+import { readTextFile, walkFiles, filterFilesByExtension, relPath } from "../utils.mjs";
 
 const HTTP_METHODS = new Set([
   "get", "post", "put", "delete", "patch", "head", "options", "all"
@@ -32,8 +32,10 @@ const TS_EXTS = new Set([".ts", ".tsx"]);
  *      name + MemberExpression last-property name + property names of inline
  *      array elements. Stored as `authMarkers` for the auth classifier.
  */
-export function parseExpress(targetDir, excludePaths = [], scanOptions = {}) {
-  const files = walkFiles(targetDir, EXTS, excludePaths, scanOptions);
+export function parseExpress(targetDir, excludePaths = [], scanOptions = {}, candidateFiles = null) {
+  const files = candidateFiles === null
+    ? walkFiles(targetDir, EXTS, excludePaths, scanOptions)
+    : filterFilesByExtension(candidateFiles, EXTS);
   const endpoints = [];
   const warnings = [];
 
diff --git a/lib/parsers/fastify.mjs b/lib/parsers/fastify.mjs
index a850afe..3177b2a 100644
--- a/lib/parsers/fastify.mjs
+++ b/lib/parsers/fastify.mjs
@@ -1,6 +1,6 @@
 import * as acorn from "acorn";
 import * as walk from "acorn-walk";
-import { readTextFile, walkFiles, relPath } from "../utils.mjs";
+import { readTextFile, walkFiles, filterFilesByExtension, relPath } from "../utils.mjs";
 
 const HTTP_METHODS = new Set([
   "get", "post", "put", "delete", "patch", "head", "options", "all"
@@ -17,8 +17,10 @@ const EXTS = [".js", ".mjs", ".cjs"];
  *   - fastify.register(plugin, { prefix: '/api/v1' }) — prefix bindings are
  *     not propagated across files in v0.1; declared here for future use.
  */
-export function parseFastify(targetDir, excludePaths = [], scanOptions = {}) {
-  const files = walkFiles(targetDir, EXTS, excludePaths, scanOptions);
+export function parseFastify(targetDir, excludePaths = [], scanOptions = {}, candidateFiles = null) {
+  const files = candidateFiles === null
+    ? walkFiles(targetDir, EXTS, excludePaths, scanOptions)
+    : filterFilesByExtension(candidateFiles, EXTS);
   const endpoints = [];
   const warnings = [];
 
diff --git a/lib/parsers/nest.mjs b/lib/parsers/nest.mjs
index ecdc76d..a062c35 100644
--- a/lib/parsers/nest.mjs
+++ b/lib/parsers/nest.mjs
@@ -1,4 +1,4 @@
-import { readTextFile, walkFiles, relPath } from "../utils.mjs";
+import { readTextFile, walkFiles, filterFilesByExtension, relPath } from "../utils.mjs";
 
 const EXTS = [".ts", ".js", ".mjs", ".tsx"];
 
@@ -32,8 +32,10 @@ const METHOD_DECORATORS = [
  * Unresolvable cases (controller path is a variable, dynamic decorator
  * argument, missing class body): record with resolved: false.
  */
-export function parseNest(targetDir, excludePaths = [], scanOptions = {}) {
-  const files = walkFiles(targetDir, EXTS, excludePaths, scanOptions);
+export function parseNest(targetDir, excludePaths = [], scanOptions = {}, candidateFiles = null) {
+  const files = candidateFiles === null
+    ? walkFiles(targetDir, EXTS, excludePaths, scanOptions)
+    : filterFilesByExtension(candidateFiles, EXTS);
   const endpoints = [];
   const warnings = [];
 
diff --git a/lib/parsers/openapi.mjs b/lib/parsers/openapi.mjs
index 0fe4daf..d1eef3d 100644
--- a/lib/parsers/openapi.mjs
+++ b/lib/parsers/openapi.mjs
@@ -1,5 +1,5 @@
 import * as YAML from "yaml";
-import { readTextFile, walkFiles, relPath } from "../utils.mjs";
+import { readTextFile, walkFiles, filterFilesByExtension, relPath } from "../utils.mjs";
 
 const EXTS = [".yaml", ".yml", ".json"];
 const HTTP_METHODS = new Set(["get", "post", "put", "delete", "patch", "head", "options", "trace"]);
@@ -15,8 +15,10 @@ const HTTP_METHODS = new Set(["get", "post", "put", "delete", "patch", "head", "
  * if a non-empty root `security` covers it. Operation-level `security: []`
  * explicitly removes auth → OPEN. Missing security blocks → UNKNOWN.
  */
-export function parseOpenApi(targetDir, excludePaths = [], scanOptions = {}) {
-  const files = walkFiles(targetDir, EXTS, excludePaths, scanOptions);
+export function parseOpenApi(targetDir, excludePaths = [], scanOptions = {}, candidateFiles = null) {
+  const files = candidateFiles === null
+    ? walkFiles(targetDir, EXTS, excludePaths, scanOptions)
+    : filterFilesByExtension(candidateFiles, EXTS);
   const endpoints = [];
   const warnings = [];
   const specsDetected = [];
diff --git a/lib/utils.mjs b/lib/utils.mjs
index fc87560..4f3d80d 100644
--- a/lib/utils.mjs
+++ b/lib/utils.mjs
@@ -136,6 +136,12 @@ export function walkFiles(targetDir, extensions, excludePatterns = [], scanOptio
   return out;
 }
 
+/** Return the deterministic subset of an existing candidate index for `extensions`. */
+export function filterFilesByExtension(files, extensions) {
+  const exts = new Set(extensions.map(e => e.toLowerCase()));
+  return files.filter(file => exts.has(path.extname(file).toLowerCase()));
+}
+
 export function readTextFile(file, maxBytes = DEFAULT_SCAN_OPTIONS.maxFileBytes) {
   let st;
   try {
diff --git a/test/scan-safeguards.mjs b/test/scan-safeguards.mjs
index 90a2f0e..7574df7 100644
--- a/test/scan-safeguards.mjs
+++ b/test/scan-safeguards.mjs
@@ -3,7 +3,13 @@ import fs from "fs";
 import os from "os";
 import { spawnSync } from "child_process";
 import { fileURLToPath } from "url";
-import { runner, assertEq, assertIncludes, assertNotIncludes } from "./_runner.mjs";
+import { runner, assertEq, assertDeepEq, assertIncludes, assertNotIncludes } from "./_runner.mjs";
+import { buildInventory } from "../lib/inventory.mjs";
+import { loadConfig } from "../lib/config.mjs";
+import { parseExpress } from "../lib/parsers/express.mjs";
+import { parseFastify } from "../lib/parsers/fastify.mjs";
+import { parseNest } from "../lib/parsers/nest.mjs";
+import { parseOpenApi } from "../lib/parsers/openapi.mjs";
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const root = path.resolve(__dirname, "..");
@@ -80,4 +86,43 @@ t.test("max-files limit exits clearly instead of hanging", () => {
   assertNotIncludes(run.stderr, "Error:");
 });
 
+t.test("inventory performs one candidate walk for all enabled parsers", () => {
+  const dir = makeDir();
+  fs.writeFileSync(path.join(dir, "package.json"), JSON.stringify({ name: "single-walk" }));
+  fs.writeFileSync(path.join(dir, "app.js"), "import express from 'express'; const app = express(); app.get('/ok', handler);\n");
+  fs.writeFileSync(path.join(dir, "controller.ts"), "@Controller('users') class Users { @Get(':id') one() {} }\n");
+  fs.writeFileSync(path.join(dir, "openapi.yaml"), "openapi: 3.0.0\npaths: {}\n");
+
+  const config = loadConfig(dir);
+  let progressCalls = 0;
+  config.scan = { ...config.scan, progressEvery: 1, onProgress: () => { progressCalls++; } };
+  const inventory = buildInventory(dir, config);
+
+  assertEq(progressCalls, 4, "one progress event per visited file, not per parser");
+  assertDeepEq(inventory.code.map(e => `${e.framework}:${e.method}:${e.path}`).sort(), [
+    "express:GET:/ok",
+    "nest:GET:/users/:id"
+  ]);
+});
+
+t.test("shared index preserves endpoint keys on framework fixtures", () => {
+  const cases = [
+    ["express", path.join(root, "test/fixtures/realworld-express"), parseExpress, "code"],
+    ["fastify", path.join(root, "test/fixtures/fastify-app"), parseFastify, "code"],
+    ["nest", path.join(root, "test/fixtures/nest-app"), parseNest, "code"],
+    ["openapi", path.join(root, "test/fixtures/sample-app"), parseOpenApi, "spec"]
+  ];
+  const keys = endpoints => endpoints.map(e =>
+    `${e.framework}|${e.method}|${e.path ?? "<unresolved>"}|${e.file ?? ""}|${e.line ?? ""}`
+  ).sort();
+
+  for (const [framework, fixture, parser, bucket] of cases) {
+    const config = loadConfig(fixture);
+    config.frameworks = { express: false, fastify: false, nest: false, openapi: false, [framework]: true };
+    const legacyKeys = keys(parser(fixture, config.excludePaths, config.scan).endpoints);
+    const sharedKeys = keys(buildInventory(fixture, config)[bucket]);
+    assertDeepEq(sharedKeys, legacyKeys, `${framework} endpoint keys`);
+  }
+});
+
 t.finish();