fix(triage): greptile — share auto-close marker + gate reconsider job on closed state

Address the two remaining concerns from Greptile's summary:

1. close_low_quality_prs.py duplicated the 'I'm **Agent Shin**' literal
   from triage_with_llm.AGENT_SHIN_AUTO_CLOSE_MARKER. The reconsider
   provenance check keys off that exact phrase, so silently drifting the
   two strings would break reconsider for Greptile-closed PRs without any
   test catching it. Import the marker from the sibling module instead.

2. triage_reconsider.yml fired on any '@agent-shin reconsider' comment
   regardless of whether the PR/issue was open or closed. Gating the job
   on github.event.issue.state == 'closed' skips runner provisioning for
   stray comments on open items; the triage script still re-checks state
   (skip-not-closed) as defense in depth.

.github/scripts/close_low_quality_prs.py

@@ -41,8 +41,19 @@ import json
 import re
 import subprocess
 import sys
+from pathlib import Path
 from typing import Iterable
 
+# Share the auto-close marker with the sibling Agent Shin script instead of
+# duplicating the literal — the reconsider provenance check
+# (`was_auto_closed_by_agent_shin`) keys off this exact phrase, so a drift
+# between the two files would silently break reconsider for Greptile-closed
+# PRs without any test catching it.
+_SCRIPTS_DIR = Path(__file__).resolve().parent
+if str(_SCRIPTS_DIR) not in sys.path:
+    sys.path.insert(0, str(_SCRIPTS_DIR))
+from triage_with_llm import AGENT_SHIN_AUTO_CLOSE_MARKER  # noqa: E402
+
 # Greptile's GitHub App appears as `greptile-apps[bot]` in REST API comments
 # and `greptile-apps` in `gh pr view --json` output. Accept either form.
 GREPTILE_BOT_LOGINS = frozenset({"greptile-apps", "greptile-apps[bot]"})
@@ -245,7 +256,7 @@ def close_pr(
         return
 
     comment_body = (
-        "👋 Hi, thanks for the PR! I'm **Agent Shin**, the automated triage "
+        f"👋 Hi, thanks for the PR! {AGENT_SHIN_AUTO_CLOSE_MARKER}, the automated triage "
         "bot for this repository. Closing as part of automated PR triage.\n\n"
         f"Greptile's most recent review scored this PR **{score}/5**, below "
         f"our merge bar of **{threshold}/5**.\n\n"

.github/workflows/triage_reconsider.yml

@@ -32,9 +32,16 @@ permissions:
 
 jobs:
   reconsider:
+    # Reconsider only makes sense on a CLOSED PR/issue — its job is to
+    # re-evaluate and (on pass) reopen. Gating the job here means a
+    # stray `@agent-shin reconsider` on an open PR/issue exits before
+    # checkout/Python/pip ever runs, instead of spinning up the runner
+    # to be a no-op. The triage script itself still re-checks state
+    # (`skip-not-closed`) as defense in depth.
     if: |
       github.repository == 'BerriAI/litellm'
       && contains(github.event.comment.body, '@agent-shin reconsider')
+      && github.event.issue.state == 'closed'
     runs-on: ubuntu-latest
     steps:
       - name: Authorize commenter