diff --git a/wasm-port/docs/compatibility-validation.md b/wasm-port/docs/compatibility-validation.md
index 245e481..a2730c5 100644
--- a/wasm-port/docs/compatibility-validation.md
+++ b/wasm-port/docs/compatibility-validation.md
@@ -236,6 +236,12 @@ machine-session validation remain future work.
 
 ## WASM/Browser Fixture Matrix
 
+The executable fixture lists for Node WASM and browser interpreter smoke tests
+are centralized in `tests/fixtures/interp-fixture-matrix.mjs`. Additions to the
+matrix must continue to route execution through the SDK and exported C ABI
+backed by vendored LinuxCNC interpreter code; the matrix is only a test
+coverage list, not a CNC behavior implementation.
+
 Node WASM `Interp::execute()` coverage currently includes:
 
 - `minimal_linear`
diff --git a/wasm-port/tests/browser/interp_smoke.html b/wasm-port/tests/browser/interp_smoke.html
index 0c6eb12..04d8590 100644
--- a/wasm-port/tests/browser/interp_smoke.html
+++ b/wasm-port/tests/browser/interp_smoke.html
@@ -8,6 +8,13 @@
   <pre id="status">running</pre>
   <script type="module">
     import { createLinuxCncInterpSdk } from "../../runtime/sdk/src/index.js";
+    import {
+      INTERP_BROWSER_FILE_FIXTURES,
+      INTERP_BROWSER_MDI_FIXTURES,
+      INTERP_ERROR_FIXTURES,
+      INTERP_INI_FIXTURE,
+      INTERP_POSITION_PARAMS_FILE_FIXTURE,
+    } from "../fixtures/interp-fixture-matrix.mjs";
 
     const status = document.getElementById("status");
 
@@ -49,47 +56,13 @@
         },
       });
 
-      for (const fixtureName of [
-        "minimal_linear",
-        "arc_semantics",
-        "length_units",
-        "modal_incremental",
-        "plane_selection",
-        "coordinate_offsets",
-        "g53_machine_coordinates",
-        "feed_control_modes",
-        "canned_cycles",
-        "numbered_params",
-        "comment_logging",
-        "tool_semantics",
-        "tool_table_setup",
-        "probe_semantics",
-        "spindle_orient",
-        "cutter_comp_motion",
-        "threading_sync",
-        "nurbs_g5_semantics",
-        "nurbs_g6_semantics",
-        "state_tag_motion",
-        "canon_runtime_edges",
-        "tool_reload",
-        "program_end_modal_reset",
-      ]) {
+      for (const fixtureName of INTERP_BROWSER_MDI_FIXTURES) {
         const programText = await fetchText(`../fixtures/gcode/${fixtureName}.ngc`);
         const expectedText = await fetchText(`../fixtures/canon/${fixtureName}.events`);
         verifyExpectedOutput(fixtureName, interp.runProgram(programText), expectedText.trimEnd());
       }
 
-      for (const errorFixtureName of [
-        "g1_zero_feed",
-        "arc_radius_mismatch",
-        "arc_zero_radius",
-        "g53_incremental",
-        "cutter_comp_plane_change",
-        "namedparam_readonly",
-        "numbered_param_readonly",
-        "tool_length_offset_not_found",
-        "tool_not_found",
-      ]) {
+      for (const errorFixtureName of INTERP_ERROR_FIXTURES) {
         verifyExpectedOutput(
           errorFixtureName,
           interp.runProgram(await fetchText(`../fixtures/gcode_errors/${errorFixtureName}.ngc`)),
@@ -97,16 +70,22 @@
         );
       }
 
-      const positionParamsText = await fetchText("../fixtures/gcode/position_params.ngc");
-      const positionParamsPath = "/work/position_params.ngc";
+      const positionParamsText = await fetchText(
+        `../fixtures/gcode/${INTERP_POSITION_PARAMS_FILE_FIXTURE}.ngc`,
+      );
+      const positionParamsPath = `/work/${INTERP_POSITION_PARAMS_FILE_FIXTURE}.ngc`;
       interp.writeTextFile(positionParamsPath, positionParamsText);
       verifyExpectedOutput(
-        "position_params_file",
+        `${INTERP_POSITION_PARAMS_FILE_FIXTURE}_file`,
         interp.runFile(positionParamsPath),
-        (await fetchText("../fixtures/canon_file/position_params.events")).trimEnd(),
+        (
+          await fetchText(
+            `../fixtures/canon_file/${INTERP_POSITION_PARAMS_FILE_FIXTURE}.events`,
+          )
+        ).trimEnd(),
       );
 
-      for (const fileFixtureName of ["file_open_reset", "percent_file_finish", "oword_subroutine"]) {
+      for (const fileFixtureName of INTERP_BROWSER_FILE_FIXTURES) {
         const programPath = `/work/${fileFixtureName}.ngc`;
         interp.writeTextFile(programPath, await fetchText(`../fixtures/gcode/${fileFixtureName}.ngc`));
         verifyExpectedOutput(
@@ -118,15 +97,15 @@
 
       const namedParamIniPath = "/work/namedparams.ini";
       interp.writeTextFile(namedParamIniPath, await fetchText("../fixtures/ini/namedparams.ini"));
-      const namedParamPath = "/work/namedparam_semantics.ngc";
+      const namedParamPath = `/work/${INTERP_INI_FIXTURE}.ngc`;
       interp.writeTextFile(
         namedParamPath,
-        await fetchText("../fixtures/gcode/namedparam_semantics.ngc"),
+        await fetchText(`../fixtures/gcode/${INTERP_INI_FIXTURE}.ngc`),
       );
       verifyExpectedOutput(
-        "namedparam_semantics_file",
+        `${INTERP_INI_FIXTURE}_file`,
         interp.runFileWithIni(namedParamPath, namedParamIniPath),
-        (await fetchText("../fixtures/canon/namedparam_semantics.events")).trimEnd(),
+        (await fetchText(`../fixtures/canon/${INTERP_INI_FIXTURE}.events`)).trimEnd(),
       );
 
       status.textContent = "browser_interp_smoke=ok";
diff --git a/wasm-port/tests/fixtures/interp-fixture-matrix.mjs b/wasm-port/tests/fixtures/interp-fixture-matrix.mjs
new file mode 100644
index 0000000..bcd4a00
--- /dev/null
+++ b/wasm-port/tests/fixtures/interp-fixture-matrix.mjs
@@ -0,0 +1,80 @@
+export const INTERP_MDI_FIXTURES = [
+  "minimal_linear",
+  "arc_semantics",
+  "length_units",
+  "modal_incremental",
+  "plane_selection",
+  "coordinate_offsets",
+  "g53_machine_coordinates",
+  "feed_control_modes",
+  "position_params",
+  "probe_semantics",
+  "spindle_orient",
+  "comment_logging",
+  "numbered_params",
+  "tool_semantics",
+  "tool_table_setup",
+  "tool_reload",
+  "canned_cycles",
+  "cutter_comp_motion",
+  "threading_sync",
+  "nurbs_g5_semantics",
+  "nurbs_g6_semantics",
+  "state_tag_motion",
+  "canon_runtime_edges",
+  "program_end_modal_reset",
+];
+
+export const INTERP_BROWSER_MDI_FIXTURES = INTERP_MDI_FIXTURES.filter(
+  (fixtureName) => fixtureName !== "position_params",
+);
+
+export const INTERP_ERROR_FIXTURES = [
+  "g1_zero_feed",
+  "arc_radius_mismatch",
+  "arc_zero_radius",
+  "cutter_comp_plane_change",
+  "g53_incremental",
+  "namedparam_readonly",
+  "numbered_param_readonly",
+  "tool_not_found",
+  "tool_length_offset_not_found",
+];
+
+export const INTERP_FILE_FIXTURES = [
+  "minimal_linear",
+  "arc_semantics",
+  "length_units",
+  "modal_incremental",
+  "plane_selection",
+  "coordinate_offsets",
+  "g53_machine_coordinates",
+  "feed_control_modes",
+  "probe_semantics",
+  "spindle_orient",
+  "comment_logging",
+  "numbered_params",
+  "tool_semantics",
+  "tool_table_setup",
+  "tool_reload",
+  "canned_cycles",
+  "cutter_comp_motion",
+  "threading_sync",
+  "nurbs_g5_semantics",
+  "nurbs_g6_semantics",
+  "state_tag_motion",
+  "canon_runtime_edges",
+  "program_end_modal_reset",
+  "file_open_reset",
+  "percent_file_finish",
+  "oword_subroutine",
+];
+
+export const INTERP_BROWSER_FILE_FIXTURES = [
+  "file_open_reset",
+  "percent_file_finish",
+  "oword_subroutine",
+];
+
+export const INTERP_INI_FIXTURE = "namedparam_semantics";
+export const INTERP_POSITION_PARAMS_FILE_FIXTURE = "position_params";
diff --git a/wasm-port/tests/wasm/node/verify_interp_wasm.mjs b/wasm-port/tests/wasm/node/verify_interp_wasm.mjs
index 1b52828..ee97a05 100644
--- a/wasm-port/tests/wasm/node/verify_interp_wasm.mjs
+++ b/wasm-port/tests/wasm/node/verify_interp_wasm.mjs
@@ -4,6 +4,13 @@ import { dirname, resolve } from "node:path";
 import assert from "node:assert/strict";
 
 import { createLinuxCncInterpSdk } from "../../../runtime/sdk/src/index.js";
+import {
+  INTERP_ERROR_FIXTURES,
+  INTERP_FILE_FIXTURES,
+  INTERP_INI_FIXTURE,
+  INTERP_MDI_FIXTURES,
+  INTERP_POSITION_PARAMS_FILE_FIXTURE,
+} from "../../fixtures/interp-fixture-matrix.mjs";
 
 function verifyExpectedOutput(fixtureName, output, expectedText) {
   const expectedLines = expectedText.split("\n").filter(Boolean);
@@ -40,34 +47,7 @@ const interp = await createLinuxCncInterpSdk({
   },
 });
 
-const fixtureNames = [
-  "minimal_linear",
-  "arc_semantics",
-  "length_units",
-  "modal_incremental",
-  "plane_selection",
-  "coordinate_offsets",
-  "g53_machine_coordinates",
-  "feed_control_modes",
-  "position_params",
-  "probe_semantics",
-  "spindle_orient",
-  "comment_logging",
-  "numbered_params",
-  "tool_semantics",
-  "tool_table_setup",
-  "tool_reload",
-  "canned_cycles",
-  "cutter_comp_motion",
-  "threading_sync",
-  "nurbs_g5_semantics",
-  "nurbs_g6_semantics",
-  "state_tag_motion",
-  "canon_runtime_edges",
-  "program_end_modal_reset",
-];
-
-for (const fixtureName of fixtureNames) {
+for (const fixtureName of INTERP_MDI_FIXTURES) {
   const programText = readFileSync(
     resolve(rootDir, `tests/fixtures/gcode/${fixtureName}.ngc`),
     "utf8",
@@ -86,32 +66,20 @@ interp.writeTextFile(
   readFileSync(resolve(rootDir, "tests/fixtures/ini/namedparams.ini"), "utf8"),
 );
 const namedParamProgramText = readFileSync(
-  resolve(rootDir, "tests/fixtures/gcode/namedparam_semantics.ngc"),
+  resolve(rootDir, `tests/fixtures/gcode/${INTERP_INI_FIXTURE}.ngc`),
   "utf8",
 );
 const namedParamExpected = readFileSync(
-  resolve(rootDir, "tests/fixtures/canon/namedparam_semantics.events"),
+  resolve(rootDir, `tests/fixtures/canon/${INTERP_INI_FIXTURE}.events`),
   "utf8",
 ).trimEnd();
 verifyExpectedOutput(
-  "namedparam_semantics",
+  INTERP_INI_FIXTURE,
   interp.runProgramWithIni(namedParamProgramText, namedParamIniPath),
   namedParamExpected,
 );
 
-const errorFixtureNames = [
-  "g1_zero_feed",
-  "arc_radius_mismatch",
-  "arc_zero_radius",
-  "cutter_comp_plane_change",
-  "g53_incremental",
-  "namedparam_readonly",
-  "numbered_param_readonly",
-  "tool_not_found",
-  "tool_length_offset_not_found",
-];
-
-for (const fixtureName of errorFixtureNames) {
+for (const fixtureName of INTERP_ERROR_FIXTURES) {
   const programText = readFileSync(
     resolve(rootDir, `tests/fixtures/gcode_errors/${fixtureName}.ngc`),
     "utf8",
@@ -124,36 +92,7 @@ for (const fixtureName of errorFixtureNames) {
   verifyExpectedOutput(fixtureName, interp.runProgram(programText), expectedOutput);
 }
 
-const fileFixtureNames = [
-  "minimal_linear",
-  "arc_semantics",
-  "length_units",
-  "modal_incremental",
-  "plane_selection",
-  "coordinate_offsets",
-  "g53_machine_coordinates",
-  "feed_control_modes",
-  "probe_semantics",
-  "spindle_orient",
-  "comment_logging",
-  "numbered_params",
-  "tool_semantics",
-  "tool_table_setup",
-  "tool_reload",
-  "canned_cycles",
-  "cutter_comp_motion",
-  "threading_sync",
-  "nurbs_g5_semantics",
-  "nurbs_g6_semantics",
-  "state_tag_motion",
-  "canon_runtime_edges",
-  "program_end_modal_reset",
-  "file_open_reset",
-  "percent_file_finish",
-  "oword_subroutine",
-];
-
-for (const fixtureName of fileFixtureNames) {
+for (const fixtureName of INTERP_FILE_FIXTURES) {
   const programPath = `/work/${fixtureName}.ngc`;
   const programText = readFileSync(
     resolve(rootDir, `tests/fixtures/gcode/${fixtureName}.ngc`),
@@ -168,7 +107,7 @@ for (const fixtureName of fileFixtureNames) {
   verifyExpectedOutput(fixtureName, interp.runFile(programPath), expectedEvents);
 }
 
-const namedParamFilePath = "/work/namedparam_semantics.ngc";
+const namedParamFilePath = `/work/${INTERP_INI_FIXTURE}.ngc`;
 interp.writeTextFile(namedParamFilePath, namedParamProgramText);
 verifyExpectedOutput(
   "namedparam_semantics_file",
@@ -179,13 +118,19 @@ verifyExpectedOutput(
 const positionParamsFilePath = "/work/position_params.ngc";
 interp.writeTextFile(
   positionParamsFilePath,
-  readFileSync(resolve(rootDir, "tests/fixtures/gcode/position_params.ngc"), "utf8"),
+  readFileSync(
+    resolve(rootDir, `tests/fixtures/gcode/${INTERP_POSITION_PARAMS_FILE_FIXTURE}.ngc`),
+    "utf8",
+  ),
 );
 verifyExpectedOutput(
-  "position_params_file",
+  `${INTERP_POSITION_PARAMS_FILE_FIXTURE}_file`,
   interp.runFile(positionParamsFilePath),
   readFileSync(
-    resolve(rootDir, "tests/fixtures/canon_file/position_params.events"),
+    resolve(
+      rootDir,
+      `tests/fixtures/canon_file/${INTERP_POSITION_PARAMS_FILE_FIXTURE}.events`,
+    ),
     "utf8",
   ).trimEnd(),
 );