fix(salary): convert the IDA workbook again ("Firmanavn og by" header) and list unreachable in the scrape schema (#615)

"firma" joins COMPOUND_PATTERNS so the glued Danish header "Firmanavn og by"
matches again; whole-token matching since #75 skipped both sheets of the
repository's own demonstration workbook with "Could not find header row".
Every other workbook converts byte-identically. Also folds the `unreachable`
status from #564 into the seen_jobs.json schema enum in the scrape spec.

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

.claude/skills/job-scraper/SKILL.md

@@ -161,7 +161,7 @@ It prints one line: the canonical key for that posting. The key must be a pure f
       "posted_date": "YYYY-MM-DD" | null,
       "deadline": "YYYY-MM-DD" | null,
       "fit": "high/medium/low",
-      "status": "new/skipped/ranked/expired",
+      "status": "new/skipped/ranked/expired/unreachable",
       "portal": "<source portal skill, e.g. jobindex-search>",
       "source": "cli/websearch"
     }