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)

src/cliCommandNames.ts

@@ -1,6 +1,7 @@
 /** Canonical names used by every one-shot CLI command registration. */
 export const CLI_COMMANDS = Object.freeze({
   inspectPacketCapture: "inspect-packet-capture",
+  decodeSignalRecording: "decode-signal-recording",
   inspectWasmArtifact: "inspect-wasm-artifact",
   inspectSqliteDatabase: "inspect-sqlite-database",
   inspectEvmInterface: "inspect-evm-interface",