fix(specs): qualify seen_jobs.json as job_scraper/seen_jobs.json in /rank, /notion-sync and /upskill (#617)

Follow-up to #608 at the maintainer's invitation. /scrape already names the full
path; the three readers still used the bare filename, which an agent can resolve
to the repo root (outside the **/job_scraper/seen_jobs.json ignore rule).
The guard test now covers all four specs; test_notion_sync_command pins the
qualified phrase. 04-job-evaluation.md is left alone on purpose: forks
personalize it, and a one-word fix there would force a framework_version bump.

tests/test_notion_sync_command.py

@@ -49,7 +49,7 @@ class NotionSyncCommandSpec(unittest.TestCase):
         # lookup of `role` on the entry, which never matches, so one job became
         # two Notion rows with different Keys. The join is role-vs-title.
         text = COMMAND.read_text(encoding="utf-8")
-        line = next(l for l in text.splitlines() if "matched to `seen_jobs.json` entries" in l)
+        line = next(l for l in text.splitlines() if "matched to `job_scraper/seen_jobs.json` entries" in l)
         self.assertIn("company + title", line)
         self.assertIn("`title`", line)
         self.assertIn("`role`", line)