feat(signals): decode recordings with bounded sigrok output (#2339)

Decode caller-selected protocols from existing recordings through shared
CLI/MCP Evidence. Page literal output lines after complete decoding;
preserve explicit full output, source identity and failed cleanup ownership.

Verified real sigrok-cli 0.7.2 workflows, published UART/SPI/I2C recordings,
independent UART values, selector limits, SDK schemas and cleanup regressions.

Co-authored-by: Olorinm <59321404+Olorinm@users.noreply.github.com>
Assisted-by: Kogasa (gensokyo-skills:kogasa-surprise-testing)

.github/workflows/real-signal-recording.yml

@@ -0,0 +1,50 @@
+name: Real signal recording
+on:
+  workflow_dispatch:
+  pull_request:
+    paths:
+      - "tests/boundary/signals/**"
+      - "tests/boundary/cli/signalCleanup.test.ts"
+      - "tests/boundary/mcp/signalRecordingMcp.test.ts"
+      - "src/signals/**"
+      - "src/domain/signals/**"
+      - "src/application/signals/**"
+      - "src/contracts/signals/**"
+      - "src/composition/signals.ts"
+      - "src/cli/signalCommands.ts"
+      - "src/server/registerSignalTools.ts"
+      - "src/server/createServer.ts"
+      - "src/server/sessionAvailabilityPolicy.ts"
+      - "src/application/CapabilityInventory.ts"
+      - "src/contracts/toolContracts.ts"
+      - "src/contracts/toolEffects.ts"
+      - "src/cli.ts"
+      - "src/cliCommandNames.ts"
+      - "src/process/**"
+      - "src/artifacts/readStableArtifact.ts"
+      - "scripts/verify-signal-recording.mjs"
+      - ".github/workflows/real-signal-recording.yml"
+      - "package*.json"
+      - ".nvmrc"
+permissions:
+  contents: read
+concurrency:
+  group: real-signal-recording-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+jobs:
+  sigrok:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+          cache: npm
+      - run: sudo apt-get update && sudo apt-get install -y sigrok-cli util-linux python3
+      - run: npm ci
+      - run: npm run build:cached
+      - run: npm run test:focused -- src/process/LinuxResourceLimits.test.ts src/domain/signals/annotationTextWindow.test.ts tests/boundary/signals/recordingProvider.test.ts tests/boundary/signals/recordingDescriptorCleanup.test.ts tests/boundary/signals/resourceLimits.test.ts tests/boundary/mcp/signalRecordingMcp.test.ts tests/boundary/cli/signalCleanup.test.ts
+      - run: node scripts/verify-signal-recording.mjs
+        env:
+          REA_SIGROK_COMMAND: /usr/bin/sigrok-cli