diff --git a/.github/actions/portable-build-cache/action.yml b/.github/actions/portable-build-cache/action.yml
index ad127ce3dc..cee775ec52 100644
--- a/.github/actions/portable-build-cache/action.yml
+++ b/.github/actions/portable-build-cache/action.yml
@@ -1,14 +1,24 @@
 name: Portable build cache
-description: Reuse Turbo build outputs without serializing verification jobs.
+description: Restore portable Turbo build outputs from the current run or cross-run cache.
 inputs:
   save:
     description: Save newly built outputs after the job succeeds.
     default: "false"
+  build_cache_artifact:
+    description: Reuse portable Turbo outputs uploaded by the current workflow run.
+    default: ""
 runs:
   using: composite
   steps:
+    - name: Download portable build outputs from this workflow run
+      if: inputs.build_cache_artifact != ''
+      uses: actions/download-artifact@v4
+      with:
+        name: ${{ inputs.build_cache_artifact }}
+        path: .turbo/cache/
     - name: Resolve portable build task hashes
       id: plan
+      if: inputs.build_cache_artifact == ''
       shell: bash
       env:
         BUILD_CACHE_PREFIX: rea-portable-build-v2-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('.npmrc', '.nvmrc', 'package-lock.json') }}
@@ -28,14 +38,14 @@ runs:
             console.log(`prefix=${process.env.BUILD_CACHE_PREFIX}-`);
           ' >> "$GITHUB_OUTPUT"
     - name: Restore portable build outputs
-      if: inputs.save != 'true'
+      if: inputs.build_cache_artifact == '' && inputs.save != 'true'
       uses: actions/cache/restore@v4
       with:
         path: .turbo/cache/
         key: ${{ steps.plan.outputs.key }}
         restore-keys: ${{ steps.plan.outputs.prefix }}
     - name: Restore and save portable build outputs
-      if: inputs.save == 'true'
+      if: inputs.build_cache_artifact == '' && inputs.save == 'true'
       uses: actions/cache@v4
       with:
         path: .turbo/cache/
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 28373f89d2..e0516da850 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -190,7 +190,18 @@ jobs:
   build:
     name: Build package
     needs: changes
-    if: needs.changes.outputs.code == 'true'
+    # Reusable provider workflows consume this run's portable build artifact,
+    # even when a workflow-only edit selects the lane without portable tests.
+    if: >-
+      needs.changes.outputs.code == 'true' ||
+      needs.changes.outputs.browser == 'true' ||
+      needs.changes.outputs.binary_layout == 'true' ||
+      needs.changes.outputs.evm == 'true' ||
+      needs.changes.outputs.javascript_recovery == 'true' ||
+      needs.changes.outputs.recorded_crash == 'true' ||
+      needs.changes.outputs.web_network == 'true' ||
+      needs.changes.outputs.web_runtime == 'true' ||
+      needs.changes.outputs.web_source_map == 'true'
     runs-on: ubuntu-latest
     timeout-minutes: 10
     permissions:
@@ -673,44 +684,60 @@ jobs:
           if-no-files-found: error
 
   browser:
-    needs: [changes, static]
+    needs: [changes, static, build]
     if: needs.changes.outputs.browser == 'true'
     uses: ./.github/workflows/real-browser.yml
+    with:
+      build_cache_artifact: rea-build-cache
 
   binary_layout:
-    needs: [changes, static]
+    needs: [changes, static, build]
     if: needs.changes.outputs.binary_layout == 'true'
     uses: ./.github/workflows/real-binary-layout.yml
+    with:
+      build_cache_artifact: rea-build-cache
 
   evm:
-    needs: [changes, static]
+    needs: [changes, static, build]
     if: needs.changes.outputs.evm == 'true'
     uses: ./.github/workflows/real-evm-interface.yml
+    with:
+      build_cache_artifact: rea-build-cache
 
   javascript_recovery:
-    needs: [changes, static]
+    needs: [changes, static, build]
     if: needs.changes.outputs.javascript_recovery == 'true'
     uses: ./.github/workflows/real-javascript-recovery.yml
+    with:
+      build_cache_artifact: rea-build-cache
 
   recorded_crash:
-    needs: [changes, static]
+    needs: [changes, static, build]
     if: needs.changes.outputs.recorded_crash == 'true'
     uses: ./.github/workflows/real-recorded-crash.yml
+    with:
+      build_cache_artifact: rea-build-cache
 
   web_network:
-    needs: [changes, static]
+    needs: [changes, static, build]
     if: needs.changes.outputs.web_network == 'true'
     uses: ./.github/workflows/real-web-network-captures.yml
+    with:
+      build_cache_artifact: rea-build-cache
 
   web_runtime:
-    needs: [changes, static]
+    needs: [changes, static, build]
     if: needs.changes.outputs.web_runtime == 'true'
     uses: ./.github/workflows/real-web-runtime.yml
+    with:
+      build_cache_artifact: rea-build-cache
 
   web_source_map:
-    needs: [changes, static]
+    needs: [changes, static, build]
     if: needs.changes.outputs.web_source_map == 'true'
     uses: ./.github/workflows/real-web-source-map.yml
+    with:
+      build_cache_artifact: rea-build-cache
 
   nativeaot:
     needs: [changes, static]
diff --git a/.github/workflows/real-binary-layout.yml b/.github/workflows/real-binary-layout.yml
index 8dd6f98667..5cec952ce7 100644
--- a/.github/workflows/real-binary-layout.yml
+++ b/.github/workflows/real-binary-layout.yml
@@ -8,6 +8,12 @@ on:
         type: boolean
         default: false
   workflow_call:
+    inputs:
+      build_cache_artifact:
+        description: Portable build cache artifact from the calling CI run.
+        required: false
+        type: string
+        default: ""
 
 permissions:
   contents: read
@@ -29,6 +35,8 @@ jobs:
           cache: npm
       - run: npm ci
       - uses: ./.github/actions/portable-build-cache
+        with:
+          build_cache_artifact: ${{ inputs.build_cache_artifact }}
       - name: Acquire exact upstream libraries in an isolated runner environment
         shell: bash
         run: |
diff --git a/.github/workflows/real-browser.yml b/.github/workflows/real-browser.yml
index 11a8b7a539..912fdafb1b 100644
--- a/.github/workflows/real-browser.yml
+++ b/.github/workflows/real-browser.yml
@@ -2,6 +2,12 @@ name: Real browser verification
 
 on:
   workflow_call:
+    inputs:
+      build_cache_artifact:
+        description: Portable build cache artifact from the calling CI run.
+        required: false
+        type: string
+        default: ""
   workflow_dispatch:
 
 env:
@@ -22,6 +28,8 @@ jobs:
           cache: npm
       - run: npm ci
       - uses: ./.github/actions/portable-build-cache
+        with:
+          build_cache_artifact: ${{ inputs.build_cache_artifact }}
       - run: npm run verify:browser
         env:
           REA_BROWSER_EXECUTABLE: /usr/bin/google-chrome
diff --git a/.github/workflows/real-evm-interface.yml b/.github/workflows/real-evm-interface.yml
index b335f13911..dfdd3970fe 100644
--- a/.github/workflows/real-evm-interface.yml
+++ b/.github/workflows/real-evm-interface.yml
@@ -3,6 +3,12 @@ name: Real offline EVM interface
 on:
   workflow_dispatch:
   workflow_call:
+    inputs:
+      build_cache_artifact:
+        description: Portable build cache artifact from the calling CI run.
+        required: false
+        type: string
+        default: ""
 
 permissions:
   contents: read
@@ -23,6 +29,8 @@ jobs:
           cache: npm
       - run: npm ci
       - uses: ./.github/actions/portable-build-cache
+        with:
+          build_cache_artifact: ${{ inputs.build_cache_artifact }}
       - name: Acquire unchanged fixture compiler in isolated runner storage
         shell: bash
         run: |
diff --git a/.github/workflows/real-javascript-recovery.yml b/.github/workflows/real-javascript-recovery.yml
index d94127d639..817dc4dc06 100644
--- a/.github/workflows/real-javascript-recovery.yml
+++ b/.github/workflows/real-javascript-recovery.yml
@@ -2,6 +2,12 @@ name: Real JavaScript recovery
 
 on:
   workflow_call:
+    inputs:
+      build_cache_artifact:
+        description: Portable build cache artifact from the calling CI run.
+        required: false
+        type: string
+        default: ""
   workflow_dispatch:
 
 permissions:
@@ -24,6 +30,8 @@ jobs:
           cache: npm
       - run: npm ci
       - uses: ./.github/actions/portable-build-cache
+        with:
+          build_cache_artifact: ${{ inputs.build_cache_artifact }}
       - name: Fetch pinned Wakaru release into the job workspace
         shell: bash
         run: |
diff --git a/.github/workflows/real-recorded-crash.yml b/.github/workflows/real-recorded-crash.yml
index dc56034c8f..04467a6089 100644
--- a/.github/workflows/real-recorded-crash.yml
+++ b/.github/workflows/real-recorded-crash.yml
@@ -3,6 +3,12 @@ name: Real recorded crash evidence
 on:
   workflow_dispatch:
   workflow_call:
+    inputs:
+      build_cache_artifact:
+        description: Portable build cache artifact from the calling CI run.
+        required: false
+        type: string
+        default: ""
 
 permissions:
   contents: read
@@ -26,6 +32,8 @@ jobs:
           cache: npm
       - run: npm ci
       - uses: ./.github/actions/portable-build-cache
+        with:
+          build_cache_artifact: ${{ inputs.build_cache_artifact }}
       - name: Install GDB on the disposable CI runner
         shell: bash
         run: |
diff --git a/.github/workflows/real-web-network-captures.yml b/.github/workflows/real-web-network-captures.yml
index df340520d4..d41bb37a56 100644
--- a/.github/workflows/real-web-network-captures.yml
+++ b/.github/workflows/real-web-network-captures.yml
@@ -3,6 +3,12 @@ name: Real historical web network captures
 on:
   workflow_dispatch:
   workflow_call:
+    inputs:
+      build_cache_artifact:
+        description: Portable build cache artifact from the calling CI run.
+        required: false
+        type: string
+        default: ""
 
 permissions:
   contents: read
@@ -25,6 +31,8 @@ jobs:
         run: npm install --global npm@11.16.0
       - run: npm ci
       - uses: ./.github/actions/portable-build-cache
+        with:
+          build_cache_artifact: ${{ inputs.build_cache_artifact }}
       - name: Acquire fixed upstream native profile in runner temporary storage
         shell: bash
         run: |
diff --git a/.github/workflows/real-web-runtime.yml b/.github/workflows/real-web-runtime.yml
index 0ecdb92c65..2575c55f9c 100644
--- a/.github/workflows/real-web-runtime.yml
+++ b/.github/workflows/real-web-runtime.yml
@@ -1,6 +1,12 @@
 name: Real website runtime attribution
 on:
   workflow_call:
+    inputs:
+      build_cache_artifact:
+        description: Portable build cache artifact from the calling CI run.
+        required: false
+        type: string
+        default: ""
   workflow_dispatch:
 permissions:
   contents: read
@@ -18,6 +24,8 @@ jobs:
           cache: npm
       - run: npm ci
       - uses: ./.github/actions/portable-build-cache
+        with:
+          build_cache_artifact: ${{ inputs.build_cache_artifact }}
       - run: npm run verify:browser:runtime
         env:
           REA_BROWSER_EXECUTABLE: /usr/bin/google-chrome
diff --git a/.github/workflows/real-web-source-map.yml b/.github/workflows/real-web-source-map.yml
index b946621299..8e0869eb78 100644
--- a/.github/workflows/real-web-source-map.yml
+++ b/.github/workflows/real-web-source-map.yml
@@ -1,6 +1,12 @@
 name: Real website source-map verification
 on:
   workflow_call:
+    inputs:
+      build_cache_artifact:
+        description: Portable build cache artifact from the calling CI run.
+        required: false
+        type: string
+        default: ""
   workflow_dispatch:
 permissions:
   contents: read
@@ -18,6 +24,8 @@ jobs:
           cache: npm
       - run: npm ci
       - uses: ./.github/actions/portable-build-cache
+        with:
+          build_cache_artifact: ${{ inputs.build_cache_artifact }}
       - name: Install the pinned compiler into an isolated fixture directory
         run: npm install --prefix "$RUNNER_TEMP/rea-web-source-map-compiler" --no-audit --no-fund --package-lock=false esbuild@0.25.10
       - run: npm run verify:browser:source-maps
diff --git a/docs/testing.md b/docs/testing.md
index 03121e172e..1288a954a1 100644
--- a/docs/testing.md
+++ b/docs/testing.md
@@ -982,6 +982,16 @@ timing data is reused; live provider results are never cached. Turbo outputs are
 restored by task hash, with trusted default-branch runs as cache writers and PRs
 as restore-only consumers. npm caches hold downloads, not `node_modules`.
 
+The eight automatic browser, binary-layout, EVM, JavaScript-recovery,
+recorded-crash, and web provider lanes download `rea-build-cache` from their own
+run after the build and static jobs succeed. Their existing build commands still
+validate task hashes and rebuild mismatched inputs; provider observations always
+run. Provider-workflow-only edits also admit the build without enabling source
+test shards. Direct provider dispatches retain the cross-run restore-only cache.
+This removes repeated compilation on fresh source revisions, but adds the build
+as a prerequisite: a delayed build can delay provider admission. Compare queue
+and execution times before claiming an end-to-end speedup.
+
 These native baseline checks complement the Linux source-test shards and the
 separate Apple-artifact and real-provider lanes. Actual Hopper, Ghidra, IDA,
 browser and managed-tool claims require their corresponding verification lanes.
diff --git a/tests/boundary/filesystem/ciChangeScope.test.ts b/tests/boundary/filesystem/ciChangeScope.test.ts
index fa4b71ebf2..163219c39d 100644
--- a/tests/boundary/filesystem/ciChangeScope.test.ts
+++ b/tests/boundary/filesystem/ciChangeScope.test.ts
@@ -680,7 +680,9 @@ it.each([
   async (scope, name) => {
     const workflow = z
       .object({
-        on: z.object({ workflow_call: z.null() }).passthrough(),
+        on: z
+          .object({ workflow_call: z.object({}).passthrough().nullable() })
+          .passthrough(),
       })
       .parse(
         parse(
diff --git a/tests/boundary/filesystem/ciRequiredLanes.test.ts b/tests/boundary/filesystem/ciRequiredLanes.test.ts
index e460bb52b5..b6e02b54af 100644
--- a/tests/boundary/filesystem/ciRequiredLanes.test.ts
+++ b/tests/boundary/filesystem/ciRequiredLanes.test.ts
@@ -168,6 +168,115 @@ it("holds native and provider fan-out behind static validation while portable fe
   expect(jobs["test-shard"]?.needs).not.toContain("static");
 });
 
+it("binds provider build reuse to the current run while keeping standalone dispatches independent", async () => {
+  const { jobs } = await workflow();
+  const consumers = [
+    "browser",
+    "binary_layout",
+    "evm",
+    "javascript_recovery",
+    "recorded_crash",
+    "web_network",
+    "web_runtime",
+    "web_source_map",
+  ];
+  const buildTerms = z
+    .string()
+    .parse(jobs.build?.if)
+    .split("||")
+    .map((term) => term.trim());
+  // Provider workflow edits select their lane without code=true. The build
+  // producer must still run, without selecting the portable test shards.
+  expect(new Set(buildTerms)).toEqual(
+    new Set(
+      ["code", ...consumers].map(
+        (scope) => `needs.changes.outputs.${scope} == 'true'`,
+      ),
+    ),
+  );
+  expect(jobs["test-shard"]?.if).toBe("needs.changes.outputs.code == 'true'");
+  for (const name of consumers) {
+    const caller = jobs[name];
+    expect(caller?.needs).toContain("build");
+    expect(caller?.with).toEqual({ build_cache_artifact: "rea-build-cache" });
+    const path = z.string().parse(caller?.uses);
+    const called = z
+      .object({
+        on: z.object({
+          workflow_call: z.object({
+            inputs: z.record(z.string(), z.unknown()),
+          }),
+          workflow_dispatch: z.unknown(),
+        }),
+        jobs: z.record(
+          z.string(),
+          z.object({
+            steps: z.array(
+              z.object({
+                uses: z.string().optional(),
+                with: z.record(z.string(), z.unknown()).optional(),
+              }),
+            ),
+          }),
+        ),
+      })
+      .parse(
+        parse(
+          await readFile(new URL(`../../../${path}`, import.meta.url), "utf8"),
+        ),
+      );
+    expect(called.on.workflow_call.inputs.build_cache_artifact).toMatchObject({
+      type: "string",
+      default: "",
+    });
+    expect(Object.hasOwn(called.on, "workflow_dispatch")).toBe(true);
+    for (const job of Object.values(called.jobs))
+      expect(
+        job.steps.find(
+          (step) => step.uses === "./.github/actions/portable-build-cache",
+        )?.with,
+      ).toEqual({ build_cache_artifact: "${{ inputs.build_cache_artifact }}" });
+  }
+  const action = z
+    .object({
+      runs: z.object({
+        steps: z.array(
+          z.object({
+            id: z.string().optional(),
+            uses: z.string().optional(),
+            if: z.string().optional(),
+            with: z.record(z.string(), z.unknown()).optional(),
+            "continue-on-error": z.boolean().optional(),
+          }),
+        ),
+      }),
+    })
+    .parse(
+      parse(
+        await readFile(
+          new URL(
+            "../../../.github/actions/portable-build-cache/action.yml",
+            import.meta.url,
+          ),
+          "utf8",
+        ),
+      ),
+    );
+  const download = action.runs.steps.find(
+    (step) => step.uses === "actions/download-artifact@v4",
+  );
+  expect(download?.with).toEqual({
+    name: "${{ inputs.build_cache_artifact }}",
+    path: ".turbo/cache/",
+  });
+  expect(download?.if).toBe("inputs.build_cache_artifact != ''");
+  expect(download?.["continue-on-error"]).not.toBe(true);
+  for (const step of action.runs.steps.filter(
+    (step) => step.id === "plan" || step.uses?.startsWith("actions/cache"),
+  ))
+    expect(step.if).toContain("inputs.build_cache_artifact == ''");
+});
+
 it("runs workflow validation inside required static checks when selected", async () => {
   const { jobs } = await workflow();
   const steps = z
diff --git a/tests/boundary/filesystem/testTaskCache.test.ts b/tests/boundary/filesystem/testTaskCache.test.ts
index 7e06ce1a1a..5d877e8292 100644
--- a/tests/boundary/filesystem/testTaskCache.test.ts
+++ b/tests/boundary/filesystem/testTaskCache.test.ts
@@ -1,6 +1,6 @@
 import { execFile } from "node:child_process";
-import { readFile, writeFile } from "node:fs/promises";
-import { join } from "node:path";
+import { cp, readFile, writeFile } from "node:fs/promises";
+import { basename, join } from "node:path";
 import { promisify } from "node:util";
 
 import { expect, it } from "vitest";
@@ -78,7 +78,7 @@ it.skipIf(process.platform === "android")(
     await workflowGit(root, ["init", "--initial-branch=main"]);
     await workflowGit(root, ["add", "."]);
     await workflowGit(root, ["commit", "-m", "test: seed cache fixture"]);
-    const run = () =>
+    const run = (cwd = root) =>
       execute(
         process.execPath,
         [
@@ -87,7 +87,7 @@ it.skipIf(process.platform === "android")(
           "test:run",
           "--output-logs=errors-only",
         ],
-        { cwd: root, env: { ...process.env, TURBO_DAEMON: "false" } },
+        { cwd, env: { ...process.env, TURBO_DAEMON: "false" } },
       );
     await run();
     await writeFile(join(root, "README_zh.md"), "wrong command");
@@ -104,5 +104,32 @@ it.skipIf(process.platform === "android")(
         "prepared\n",
       );
     }
+    // Provider jobs receive the producer's cache in a fresh checkout, not its
+    // outputs. Turbo must restore identical inputs and rebuild changed ones.
+    const consumer = await createTestTempDirectory("rea-cache-consumer-");
+    await cp(root, consumer, {
+      recursive: true,
+      filter: (path) =>
+        basename(path) !== ".turbo" &&
+        !/^prepared-\d+\.txt$/u.test(basename(path)),
+    });
+    await cp(join(root, ".turbo/cache"), join(consumer, ".turbo/cache"), {
+      recursive: true,
+    });
+    const restored = await run(consumer);
+    expect(restored.stdout).toContain(`${dependencies.length} cached`);
+    for (const index of dependencies.keys())
+      expect(
+        await readFile(join(consumer, `prepared-${index}.txt`), "utf8"),
+      ).toBe("prepared\n");
+    await writeFile(
+      join(consumer, "artifact-input.txt"),
+      "changed producer input",
+    );
+    await run(consumer);
+    for (const index of dependencies.keys())
+      expect(
+        await readFile(join(consumer, `prepared-${index}.txt`), "utf8"),
+      ).toBe("prepared\nprepared\n");
   },
 );