feat(hal/ebds): log validator status bytes on change

Surface MEI SCR's full status-flag set in the journal — diagnostic
for stuck-bill / jam scenarios where the raw flag combination
(jammed, stalled, transportOpen, escrowed, etc.) reveals what state
the validator actually believes it's in. Dedup'd on change so 100ms
polling doesn't flood logs; firmware model + revision logged once.

packages/hal/src/validators/ebds/ebds-rs232.ts

@@ -211,6 +211,26 @@ function parseStatus(data: DestructedData): string | null {
   return null
 }
 
+/**
+ * Render destructed status bytes as a comma-separated list of truthy flags.
+ *
+ * Used for on-change diagnostic logging — produces a compact one-liner like
+ * `idling, cassetteAttached` or `escrowed, jammed, transportOpen` so the
+ * field operator can read the validator's full state out of the journal.
+ */
+function summarizeStatusFlags(dd: DestructedData): string {
+  const flags: string[] = []
+  for (const [name, on] of Object.entries(dd[0])) if (on) flags.push(name)
+  for (const [name, on] of Object.entries(dd[1])) if (on) flags.push(name)
+  // byte 2 has both boolean flags and a numeric noteValue — skip the number
+  for (const [name, on] of Object.entries(dd[2])) {
+    if (name === 'noteValue') continue
+    if (on) flags.push(name)
+  }
+  for (const [name, on] of Object.entries(dd[3])) if (on) flags.push(name)
+  return flags.join(', ') || '(none)'
+}
+
 /** Destruct the control byte (§6.4) */
 function destructCtlByte(ctl: number): { ack: number; devType: number; msgType: number } {
   return {
@@ -293,6 +313,8 @@ export class EbdsRs232 extends EventEmitter {
   private serial: SerialPort | null = null
   private ack: number = 0x0
   private enabledDenominations: number = 0x00
+  private lastStatusFlags: string | null = null
+  private firmwareLogged: boolean = false
 
   constructor(config: EbdsRs232Config) {
     super()
@@ -448,6 +470,7 @@ export class EbdsRs232 extends EventEmitter {
       validatePacket(packet)
       const result = interpret(packet)
       if (result) {
+        if (result.destructedData) this._logStatusOnChange(result.destructedData)
         this.emit('message', result)
       }
     } catch (ex) {
@@ -456,6 +479,23 @@ export class EbdsRs232 extends EventEmitter {
     }
   }
 
+  /**
+   * Log the validator's status bytes when they change. Polling runs at 100ms
+   * so we dedupe identical states — otherwise the journal would be unreadable.
+   * Logs firmware model + revision once on first parse for field diagnostics.
+   */
+  private _logStatusOnChange(dd: DestructedData): void {
+    if (!this.firmwareLogged) {
+      console.log(`[EBDS] firmware: model=${dd[4].modelNumber} revision=${dd[5].codeRevision}`)
+      this.firmwareLogged = true
+    }
+    const flags = summarizeStatusFlags(dd)
+    if (flags !== this.lastStatusFlags) {
+      console.log(`[EBDS] status: ${this.lastStatusFlags ?? '(initial)'} → ${flags}`)
+      this.lastStatusFlags = flags
+    }
+  }
+
   private _acquireSync(data: Buffer): Buffer {
     for (let i = 0; i < data.length; i++) {
       if (data[i] === STX) {
@@ -467,4 +507,4 @@ export class EbdsRs232 extends EventEmitter {
 }
 
 // Re-export for testing
-export { computeChecksum, interpret, destructData, parseStatus }
+export { computeChecksum, interpret, destructData, parseStatus, summarizeStatusFlags }