post-step: drop broad @\w+ from isNeedsInfoComment regex

The @\w+ pattern matched @ignore, @test, @OverRide etc. in backticked
code references inside plain-text comments. This caused the post-step
to misclassify an agent's 'Deleted the file...' claim on #483 as
agent/needs-info, because the comment text mentioned @ignore and @test
when describing why the class was dead.

Result: the issue got agent/needs-info, the orchestrator advanced
past it (treating needs-info as a completion signal), and the master
closed prematurely with no actual work merged.

Tighten the regex to only match explicit needs-info markers:
- 'needs more info'
- '## \ud83e\udd16 Triage' (the agent's heading)
- 'needs the following'

The proper way for the agent to signal needs-info is the \ud83e\udd16 Triage
heading; plain text is not reliable.

Author: LSantha

.github/scripts/opencode-post-step.js

@@ -30,7 +30,7 @@ function isRefusalComment(body) {
 
 function isNeedsInfoComment(body) {
   if (!body) return false;
-  return /needs more info|## 🤖 Triage|needs the following|@\w+/i.test(body);
+  return /needs more info|## 🤖 Triage|needs the following/i.test(body);
 }
 
 function isInvestigationReport(body) {