fix(scrape): use the full job_scraper/seen_jobs.json path in every step of the spec (#608)

* fix(scrape): use the full job_scraper/seen_jobs.json path in every step of the spec

Step 0 reads job_scraper/seen_jobs.json but Steps 1-4 and the rules used the bare
filename. Step 4 is where the file is written, so an agent following it literally
can create seen_jobs.json in the repo root, outside the **/job_scraper/seen_jobs.json
ignore rule, where it gets committed with the user's scrape history.

Adds a spec test that rejects bare references; relaxes the existing dedup-continuity
regex to accept the qualified path.

* docs(changelog): entry for #608

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

---------

Co-authored-by: Mads Lorentzen <madslorentzen_17@hotmail.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

tests/test_scrape_contract.py

@@ -143,7 +143,7 @@ class SeenJobsDedupContinuityTests(unittest.TestCase):
         text = SCRAPER_SKILL.read_text(encoding="utf-8")
         self.assertRegex(
             text,
-            r"URL matches any existing `seen_jobs\.json` entry, regardless of\s+that entry's key",
+            r"URL matches any existing `(?:job_scraper/)?seen_jobs\.json` entry, regardless of\s+that entry's key",
             "legacy seen_jobs entries must be matched by URL during the key-rule transition",
         )