fix(gmail-sync,outcome): keep free-form tracker notes free of CSV-breaking characters (#454) (#455)

* fix(gmail-sync): strip CSV-breaking characters from the email subject

Step 7a interpolated the raw subject line of a received email into the
`notes` column of job_search_tracker.csv. No writer here emits a quoted
tracker field, so an unescaped comma splits the row - for csv.DictReader
just as much as for a naive split, which matters because
tools/rank_state.py is the repo's only machine reader and uses exactly
that. `notes` is column 10 of 14, so a subject as ordinary as
"Re: Your application, Data Scientist" shifted cv_file,
cover_letter_file and source a column left. A line break is worse: it
ends the row and starts a second one.

The rule now sits on the append instruction itself rather than in a
general note a writer can miss. The subject survives verbatim in the
archive's outcome.md, which is Markdown and carries no such constraint.

/outcome Step 4 (outcome.md:195) is also free-form and has the same
exposure, but its text is model-authored in a turn the user is watching
rather than copied from third-party mail unattended. Left out
deliberately, to be filed separately.

* fix(outcome): keep the Step 4 tracker note free of CSV-breaking characters

/outcome Step 4 appended "a short dated note" to `notes` with no
constraint on its content, the same exposure /gmail-sync Step 7a had:
nothing quotes a tracker field, so `rejected, no feedback given` shifts
cv_file, cover_letter_file and source a column left under
csv.DictReader, and a line break ends the row. The append instruction
now requires a note with no commas, double quotes or line breaks.

Folded in at the maintainer's request on #455 so one entry and one rule
cover both free-form writers. The CSV-safety tests move out of
test_gmail_sync_command.py into test_tracker_notes_csv_safe.py, where a
CASES table pins the rule on each writer's append line.

.claude/commands/outcome.md

@@ -192,7 +192,7 @@ Update rules: tick stage checkboxes as they are reached (add the date in parenth
 
 ## Step 4: Update the Tracker
 
-Update the matched row's `status` column using the canonical spellings from **Tracker status vocabulary** above (e.g. `drafted` → `applied` → `interview` → `offer` → `hired` / `rejected` / `no_response` / `offer_declined` / `withdrawn`) and append a short dated note to the `notes` column. Never restructure the CSV, reorder rows, or touch other rows. The rewrite touches only the `status` and `notes` columns: preserve every other field of the row, parsed or not, so a value the row carries - the `deadline` written by `/apply` Step 6b, or any column added in the future - is never blanked by a status update.
+Update the matched row's `status` column using the canonical spellings from **Tracker status vocabulary** above (e.g. `drafted` → `applied` → `interview` → `offer` → `hired` / `rejected` / `no_response` / `offer_declined` / `withdrawn`) and append a short dated note to the `notes` column, **containing no commas, double quotes or line breaks**. No writer here emits a quoted tracker field, so a comma in the note shifts `cv_file`, `cover_letter_file` and `source` a column left for `csv.DictReader` (`tools/rank_state.py`) as much as for a naive split, and a line break ends the row - `rejected, no feedback given` is exactly the sentence that corrupts it; write `rejected - no feedback given`. `/gmail-sync` Step 7a applies the same rule to the email subjects it appends. Never restructure the CSV, reorder rows, or touch other rows. The rewrite touches only the `status` and `notes` columns: preserve every other field of the row, parsed or not, so a value the row carries - the `deadline` written by `/apply` Step 6b, or any column added in the future - is never blanked by a status update.
 
 **Moving a row off `drafted`:** rows written by `/apply` Step 6b carry the date the documents were drafted, not the date they were sent. Whenever this step advances such a row to any other status - `applied`, or straight to `interview` or `rejected` when the user reports an outcome for something they submitted without recording it - overwrite its `date` column with the actual submission date. The `date` column is read as "applied on" by `/notion-sync` and drives `/html-report`'s year/season grouping and this command's own days-quiet count, so leaving the draft date in place would misreport the application.