Rename to stealergram, add pyproject.toml, purge em-dashes

- Rename project to stealergram throughout
- Add pyproject.toml (replaces requirements.txt split, folds pytest.ini)
- Replace all em-dashes with hyphens across all source files

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

core/notifier.py

@@ -1,5 +1,5 @@
 """
-notifier.py — Persists hits to disk and sends Telegram bot alerts.
+notifier.py - Persists hits to disk and sends Telegram bot alerts.
 
 Includes:
   - Severity scoring via scorer.py
@@ -31,7 +31,7 @@ log = logging.getLogger(__name__)
 MAX_PREVIEW = 10   # hits to show per severity group in alert
 DEDUP_FILE  = Path("./data/dedup.json")
 
-# Only alert immediately for these severities — LOW hits are silent
+# Only alert immediately for these severities - LOW hits are silent
 ALERT_SEVERITIES = {CRITICAL, HIGH, MEDIUM}
 
 
@@ -124,7 +124,7 @@ def write_hits(scored_hits: list, source: str) -> None:
 
 
 def write_hits_csv(scored_hits: list, source: str, filename: str) -> None:
-    """Append new hits to hits.csv — one row per hit, easy to import."""
+    """Append new hits to hits.csv - one row per hit, easy to import."""
     HITS_CSV.parent.mkdir(parents=True, exist_ok=True)
     write_header = not HITS_CSV.exists()
     timestamp = _timestamp()
@@ -152,13 +152,13 @@ async def send_alert(
 ) -> None:
     """
     Send a Telegram alert grouped by severity.
-    Only includes CRITICAL, HIGH, MEDIUM — LOW hits are omitted from alerts.
+    Only includes CRITICAL, HIGH, MEDIUM - LOW hits are omitted from alerts.
     """
     summary  = summarize(scored_hits)
     alertable = [h for h in scored_hits if h.severity in ALERT_SEVERITIES]
 
     if not alertable:
-        log.info("  No alertable hits (all LOW) — skipping Telegram notification.")
+        log.info("  No alertable hits (all LOW) - skipping Telegram notification.")
         return
 
     lines = [
@@ -210,7 +210,7 @@ async def notify(bot: TelegramClient, hits: list[str], source: str, filename: st
 
     # Score first
     scored = score_hits(hits)
-    log.info(f"  Scored {len(scored)} hit(s) — {summarize(scored)}")
+    log.info(f"  Scored {len(scored)} hit(s) - {summarize(scored)}")
 
     # Deduplicate
     new_hits, dupe_hits = deduplicate(scored)
@@ -222,7 +222,7 @@ async def notify(bot: TelegramClient, hits: list[str], source: str, filename: st
         insert_hits(dupe_hits, source, filename, seen_before=True)
 
     if not new_hits:
-        log.info("  All hits already seen before — no alert sent.")
+        log.info("  All hits already seen before - no alert sent.")
         return
 
     # Push hits to TUI