fix(salary): skip prose notes tabs instead of listing sentences as companies (#644)

* fix(salary): skip prose notes tabs instead of listing sentences as companies

A workbook's notes tab ("Each row is one company in the survey.") has no
table header, so the strict header pass finds nothing and the fallback
takes the first line mentioning a company word. With no salary column
beside it, every following sentence was emitted as a company entry and
showed up in --list-all and lookups. A fallback-detected header with no
salary columns now skips the sheet with a warning.

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

* docs(changelog): record fix for #644

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

* changelog: place the #644 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>

tools/convert_salary_excel.py

@@ -162,6 +162,7 @@ def parse_sheet(ws, sheet_label=None):
         return [str(cell.value).strip() for cell in row if cell.value]
 
     header_row = None
+    corroborated = True
     for row_idx, row in enumerate(rows, start=1):
         cell_texts = _cell_texts(row)
         company_idxs = {i for i, t in enumerate(cell_texts) if header_matches(t, COMPANY_PATTERNS)}
@@ -177,6 +178,7 @@ def parse_sheet(ws, sheet_label=None):
             break
 
     if header_row is None:
+        corroborated = False
         for row_idx, row in enumerate(rows, start=1):
             if any(header_matches(t, COMPANY_PATTERNS) for t in _cell_texts(row)):
                 header_row = row_idx
@@ -282,6 +284,18 @@ def parse_sheet(ws, sheet_label=None):
     for col_idx, col_header in untyped_cols:
         categories.append({"name": col_header.lower().replace(" ", "_"), "value_col": col_idx})
 
+    if not categories and not corroborated:
+        # The fallback pass matched a lone company word and no salary column
+        # sits beside it: this is prose (a "Notes" or "About the data" tab
+        # mentioning "company"), not a table. Reading it would turn every
+        # sentence below that line into a company entry.
+        print(
+            f"Warning: Skipping sheet '{ws.title}': no table header found "
+            "(a company word appears only in text, with no salary columns).",
+            file=sys.stderr,
+        )
+        return []
+
     if not categories:
         print(
             f"Warning: No salary data columns detected in sheet '{ws.title}' "