fix(rank): report a tracker that is not UTF-8 instead of a traceback (#639)

* fix(rank): report a tracker that is not UTF-8 instead of a traceback

A job_search_tracker.csv saved with a spreadsheet's plain "CSV" type is
written in the ANSI code page, so one accented company name raised a
UnicodeDecodeError traceback in `rank_state.py candidates` and stopped
/rank at Step 1. Exit 1 with a one-line message instead.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* changelog: place the #639 entry under [Unreleased]

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Mads Lorentzen <madslorentzen_17@hotmail.com>

CHANGELOG.md

@@ -83,6 +83,12 @@ per-file diff commands.
   whole batch, although `apply` already collects per-result problems in `errors`. Each now becomes an
   `errors` row (exit 1) and the valid results in the same file are still written.
 
+- **`rank_state.py candidates` reports a tracker that is not UTF-8 instead of crashing** (#639, `tools/rank_state.py`,
+  `tests/test_rank_state.py`) - a `job_search_tracker.csv` saved with a spreadsheet's plain "CSV" type is
+  written in the ANSI code page (cp1252 on most Western installs), so one accented company name such as
+  "Ørsted" raised a `UnicodeDecodeError` traceback and stopped `/rank` at Step 1. It now exits 1 with a
+  one-line message naming the file and asking for a CSV UTF-8 save, as `load_state` does for invalid JSON.
+
 ## [1.7.3] - 2026-10-19
 
 ### Added

tests/test_rank_state.py

@@ -160,6 +160,19 @@ class Candidates(RankStateCase):
                 )
                 self.assertEqual(out["excluded_by_tracker"], int(excluded))
 
+    def test_tracker_saved_in_a_legacy_code_page_is_reported_not_a_traceback(self):
+        # A spreadsheet's plain "CSV" save on Windows writes cp1252, not UTF-8.
+        self.write_state({"a": entry()})
+        tracker = self.tmp / "tracker.csv"
+        tracker.write_bytes("date,company,role\r\n2026-08-01,Ørsted,SOC Analyst\r\n".encode("cp1252"))
+        proc = subprocess.run(
+            [sys.executable, str(TOOL), "candidates", "--state", str(self.state), "--tracker", str(tracker)],
+            capture_output=True, text=True, encoding="utf-8",
+        )
+        self.assertEqual(proc.returncode, 1)
+        self.assertIn("is not UTF-8 text - re-save it as CSV UTF-8", proc.stderr)
+        self.assertNotIn("Traceback", proc.stderr)
+
     def test_focus_filters_on_title_company_and_stored_fit_notes(self):
         self.write_state(
             {

tools/rank_state.py

@@ -149,11 +149,16 @@ def tracker_pairs(path: Path) -> set[tuple[str, str]]:
     import csv
 
     pairs = set()
-    with path.open(encoding="utf-8-sig", newline="") as fh:
-        for row in csv.DictReader(fh):
-            company, role = norm(row.get("company")), norm(row.get("role"))
-            if company:
-                pairs.add((company, role))
+    try:
+        with path.open(encoding="utf-8-sig", newline="") as fh:
+            for row in csv.DictReader(fh):
+                company, role = norm(row.get("company")), norm(row.get("role"))
+                if company:
+                    pairs.add((company, role))
+    except UnicodeDecodeError:
+        # A spreadsheet's plain "CSV" save writes the ANSI code page (cp1252 on
+        # most Western installs), so any accented company name stops decoding.
+        sys.exit(f"{path} is not UTF-8 text - re-save it as CSV UTF-8")
     return pairs