Add --raw flag to csv command to skip aggregation

- Add `to_csv_entries()` to output.py: converts raw rows to write_csv
  entries one-for-one, without merging by (project, description)
- Add `--raw` flag to the csv subparser; _cmd_csv branches on it
- Add TestToCsvEntries with 6 tests
- Update README with --raw usage example
- Add .coverage and htmlcov/ to .gitignore

src/timesheets/cli.py

@@ -19,6 +19,7 @@ from .output import (
     print_summary_weekly,
     print_summary_weekly_short,
     print_summary_weekly_totals,
+    to_csv_entries,
     write_csv,
 )
 from .parser import (
@@ -130,6 +131,15 @@ def build_parser() -> argparse.ArgumentParser:
         help="Export timesheet entries as CSV.",
     )
     _add_shared_args(csv_parser)
+    csv_parser.add_argument(
+        "--raw",
+        action="store_true",
+        default=False,
+        help=(
+            "Skip aggregation: output one CSV row per timesheet entry instead of "
+            "combining entries that share the same project and story."
+        ),
+    )
 
     status_parser = subparsers.add_parser(
         "status",
@@ -389,15 +399,15 @@ def _cmd_csv(args: argparse.Namespace, config: dict) -> None:
     rows = _resolve_rows(args, config, target_date)
     if not rows:
         print("Warning: no timesheet rows found in input.", file=sys.stderr)
-    aggregated = aggregate_rows(rows)
+    entries = to_csv_entries(rows) if args.raw else aggregate_rows(rows)
     project_map = _resolve_project_map(args, config)
 
     if args.output:
         with open(args.output, "w", newline="", encoding="utf-8") as f:
-            write_csv(aggregated, f, date_str, project_map)
+            write_csv(entries, f, date_str, project_map)
         print(f"Written to {args.output}", file=sys.stderr)
     else:
-        write_csv(aggregated, sys.stdout, date_str, project_map)
+        write_csv(entries, sys.stdout, date_str, project_map)
 
 
 # ---------------------------------------------------------------------------

src/timesheets/output.py

@@ -11,6 +11,26 @@ from .projects import resolve_project_task
 from .utils import decimal_to_hhmm
 
 
+def to_csv_entries(rows: list[dict]) -> list[dict]:
+    """Convert raw parsed rows to write_csv-compatible entries without aggregating.
+
+    Each row becomes its own entry. Open entries (duration_hours is None) are
+    skipped. Rows are not combined, even if they share the same project and
+    description.
+    """
+    from .parser import build_description
+
+    return [
+        {
+            "project": row["project"].strip(),
+            "description": build_description(row["story"], row["note"]),
+            "quantity": row["duration_hours"],
+        }
+        for row in rows
+        if row["duration_hours"] is not None
+    ]
+
+
 def write_csv(
     aggregated: list[dict],
     output: IO[str],