diag(TEMP): stderr trace span IDs through chat.message + session.idle

rc4 trace still shows orphan turn parent despite shutdown hook running cleanly. Need to confirm chat.message fires + which span ID it creates, and whether session.idle's forceFlush actually exports it. Add stderr lines covering both branches plus their span IDs. To be removed with the rest of the diagnostics before v0.1.8 proper.

Author: bcode

packages/bcode-laminar/src/plugin.ts

@@ -127,10 +127,23 @@ export const LaminarPlugin: Plugin = ({ client }) => {
           const sessionId = event.properties.sessionID
           const span = sessionCurrentTurnSpan[sessionId]
           if (span) {
+            const sid = span.spanContext().spanId
+            process.stderr.write(`[bcode-laminar] session.idle: ending turn span ${sid} session=${sessionId}\n`)
             span.end()
             delete sessionCurrentTurnSpan[sessionId]
+            const start = Date.now()
+            try {
+              await processor.forceFlush()
+              process.stderr.write(`[bcode-laminar] session.idle: forceFlush done in ${Date.now() - start}ms\n`)
+            } catch (err) {
+              process.stderr.write(
+                `[bcode-laminar] session.idle: forceFlush threw after ${Date.now() - start}ms: ${(err as Error).message}\n`,
+              )
+            }
+          } else {
+            process.stderr.write(`[bcode-laminar] session.idle: no turn span for session=${sessionId}\n`)
+            await processor.forceFlush()
           }
-          await processor.forceFlush()
           break
         }
         case "server.instance.disposed": {
@@ -143,7 +156,9 @@ export const LaminarPlugin: Plugin = ({ client }) => {
           // which the sync `shutdown` hook's `processor.forceFlush()` is a
           // no-op and turn spans are silently dropped. The sync hook is now
           // the single drain point; this handler just ends spans.
-          for (const [sessionId, span] of Object.entries(sessionCurrentTurnSpan)) {
+          const entries = Object.entries(sessionCurrentTurnSpan)
+          process.stderr.write(`[bcode-laminar] server.instance.disposed: ending ${entries.length} open turn span(s)\n`)
+          for (const [sessionId, span] of entries) {
             span.end()
             delete sessionCurrentTurnSpan[sessionId]
           }
@@ -178,7 +193,12 @@ export const LaminarPlugin: Plugin = ({ client }) => {
       const isSubagent = Object.values(subagentSessionIds).some((children) =>
         children.has(sessionID),
       )
-      if (isSubagent || sessionCurrentTurnSpan[sessionID]) return
+      if (isSubagent || sessionCurrentTurnSpan[sessionID]) {
+        process.stderr.write(
+          `[bcode-laminar] chat.message: skip (isSubagent=${isSubagent}, hasOpen=${!!sessionCurrentTurnSpan[sessionID]}) session=${sessionID}\n`,
+        )
+        return
+      }
 
       const span = startTurnSpan({
         name: "turn",
@@ -195,6 +215,9 @@ export const LaminarPlugin: Plugin = ({ client }) => {
         },
       })
       sessionCurrentTurnSpan[sessionID] = span
+      process.stderr.write(
+        `[bcode-laminar] chat.message: created turn span ${span.spanContext().spanId} session=${sessionID}\n`,
+      )
     },
   })
 }