fix: group telegram digest by posting's real location, not search label

fetch.ts already parses each job card's own location, but index.ts
discarded it and stored only the search-area label in the CSV, so
daily.ts's telegram grouping used the query that found a job instead
of where it actually is (e.g. a Bern search surfacing a Lausanne job).
Now the location is written to a new CSV column and used for grouping,
with a one-time migration for existing rows.

CLAUDE.md

@@ -50,9 +50,10 @@ plans/             # LinkedIn post drafts
     - **Basel Institute on Governance** — `baselgovernance.org/about/careers`. Each vacancy is a linked PDF, so there's no HTML description to language-check. The `rounded-3xl` card class is what separates vacancy tiles from the annual-report PDF link.
     - These boards use UN-flavoured titles ("Information Management Officer", "ICT Specialist") that `SOFTWARE_TITLE_RE` alone drops, so `INTL_TECH_RE` widens the net **for these sources only**. Boards this small can afford the noise; missing a rare opening can't.
   - **itjobs.ch** is swept Switzerland-wide (no `location` param) — the board is small, ~210 jobs over 7 pages, and locking it to Basel returned only ~9. It 404s one page past the end instead of serving an empty list. Each item embeds its full `description`, so the DE/FR check runs in-process via `isEnglishDescription` rather than costing a page fetch per job. Use `job_location.name` for location — it's the English form; the bare `location` field is German.
-- **`index.ts`** — orchestrator: loads existing IDs from `results/jobs.csv`, calls `fetchJobs`, calls `isEnglishContent` for each new job, appends survivors to CSV.
+- **`index.ts`** — orchestrator: loads existing IDs from `results/jobs.csv`, calls `fetchJobs`, calls `isEnglishContent` for each new job, appends survivors to CSV. Writes both `search` (the query/source that found the job) and `location` (the posting's own location, as parsed off its card by `fetch.ts`/`fetch-other.ts` — no extra page fetch) to the CSV. Migrates old CSVs on startup: adds `source` if missing, then `location` (backfilled `""` for rows written before the column existed).
 - **`recheck.ts`** — calls `fetchJobs(..., { raw: true })` to bypass `SOFTWARE_TITLE_RE`, then lists every new job that *would* be filtered out and prints word-frequency suggestions.
 - **`daily.ts`** — the notification layer on top of `index.ts`. Snapshots the CSV's links, shells out to `bun fetch`, then diffs to find what's new. Survivors are filtered through `matchesProfile` and grouped by area (Basel / Remote / Zürich / Bern) so the message scans on a phone. `results/sent.txt` is written **only after a successful send**, so a Telegram failure retries next run instead of silently losing jobs. A non-zero exit from `bun fetch` sends a failure notice rather than failing quietly.
+  - The area grouping matches against the CSV's `location` column (the posting's real location) first, falling back to `search` (the query/source label) only when `location` is empty — i.e. for rows written before the `location` column existed. This fixed two real mislabels: a LinkedIn "Bern" sweep can surface a job actually based in Lausanne (search label ≠ real location), and `fetch-other.ts` sources (job-room.ch, itjobs.ch, stellen-basel.ch, datacareer.ch) write the source name into `search` instead of a city, which used to dump their jobs into "⚪️ Other" regardless of where they actually were.
 - **`profile.ts`** — `matchesProfile(title, company, minScore = 4)`. Hard rejects run first (Microsoft stack, Java/C++/SAP, life-science, non-software functions, blocked companies Jobgether and ALLPS), then `SIGNALS` scores stack and seniority terms from `cv/polo.md`. This is a **second, stricter gate than the fetch filters**: `fetch.ts` decides what lands in the CSV, `profile.ts` decides what's worth a phone buzz. Widen `SOFTWARE_TITLE_RE` to catch more in the CSV; tune `SIGNALS`/`minScore` to change what gets sent.
 - **`telegram.ts`** — reads `.env` directly (no dotenv dep). Accepts `TELEGRAM_BOT` or `TELEGRAM_TOKEN` for the token. Splits at 3900 chars on line boundaries (Telegram hard-caps at 4096) and sleeps 400 ms between parts to stay under the rate limit. Messages are HTML — run titles/companies through `escapeHtml`.
 
@@ -150,6 +151,8 @@ Read `cv/polo.md` for the full profile. Key signals:
 
 Links use just the job ID as anchor text: `[4192954199](https://www.linkedin.com/jobs/view/4192954199/)`
 
+Some employers (Optiml, LocalBini seen repeatedly) repost the same role under a new job ID every few weeks rather than keeping one listing open. When several rows share the same title + company, show only the most recent job ID and drop the older duplicates from the table — they're the same opening, not new leads.
+
 ## Workflow: "find jobs in X city / remote / custom search"
 
 1. Write a temp script in `scripts/` with the right `SearchConfig` (city, workType, custom keywords).