fix: resolve all mypy type errors for strict type checking (#48)

## Summary

Fixed 30 mypy type errors across 8 files to enable strict type checking.

## Changes by Category

### no-any-return errors (fixed with explicit type casts)
- alerter/history.py: Cast Redis zcount/zremrangebyscore returns to int
- ingestor/clob_client.py: Cast API response values appropriately
- ingestor/publisher.py: Cast Redis xack, xlen, xtrim returns to int
- ingestor/metadata_sync.py: Cast Redis delete return to int
- detector/scorer.py: Cast Redis delete return to int

### operator errors (fixed with null checks)
- alerter/formatter.py: Added `if age_hours is not None:` guards

### External library typing issues (fixed with type: ignore)
- ingestor/publisher.py: redis-py typing issue with xadd dict parameter
- profiler/funding.py: web3 typing issue with block parameters
- storage/repos.py: SQLAlchemy Result.rowcount typing issue

### assignment errors (fixed by renaming)
- storage/repos.py: Renamed SQLite insert stmt to avoid type conflict

Closes #48

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/polymarket_insider_tracker/alerter/formatter.py

@@ -190,10 +190,11 @@ class AlertFormatter:
         wallet_age_str = ""
         if assessment.fresh_wallet_signal:
             age_hours = assessment.fresh_wallet_signal.wallet_profile.age_hours
-            if age_hours < 1:
-                wallet_age_str = f" (Age: {int(age_hours * 60)}m)"
-            else:
-                wallet_age_str = f" (Age: {age_hours:.0f}h)"
+            if age_hours is not None:
+                if age_hours < 1:
+                    wallet_age_str = f" (Age: {int(age_hours * 60)}m)"
+                else:
+                    wallet_age_str = f" (Age: {age_hours:.0f}h)"
 
         fields: list[dict[str, object]] = [
             {
@@ -282,10 +283,11 @@ class AlertFormatter:
         wallet_line = f"*Wallet:* `{wallet_short}`"
         if assessment.fresh_wallet_signal:
             age_hours = assessment.fresh_wallet_signal.wallet_profile.age_hours
-            if age_hours < 1:
-                wallet_line += f" \\(Age: {int(age_hours * 60)}m\\)"
-            else:
-                wallet_line += f" \\(Age: {age_hours:.0f}h\\)"
+            if age_hours is not None:
+                if age_hours < 1:
+                    wallet_line += f" \\(Age: {int(age_hours * 60)}m\\)"
+                else:
+                    wallet_line += f" \\(Age: {age_hours:.0f}h\\)"
         lines.append(wallet_line)
 
         # Risk score
@@ -366,10 +368,11 @@ class AlertFormatter:
         wallet_line = f"Wallet: {wallet_short}"
         if assessment.fresh_wallet_signal:
             age_hours = assessment.fresh_wallet_signal.wallet_profile.age_hours
-            if age_hours < 1:
-                wallet_line += f" (Age: {int(age_hours * 60)}m)"
-            else:
-                wallet_line += f" (Age: {age_hours:.0f}h)"
+            if age_hours is not None:
+                if age_hours < 1:
+                    wallet_line += f" (Age: {int(age_hours * 60)}m)"
+                else:
+                    wallet_line += f" (Age: {age_hours:.0f}h)"
         lines.append(wallet_line)
 
         # Risk

src/polymarket_insider_tracker/alerter/history.py

@@ -362,7 +362,7 @@ class AlertHistory:
             start.timestamp(),
             end.timestamp(),
         )
-        return count
+        return int(count)
 
     async def cleanup_old_alerts(self) -> int:
         """Remove alerts older than retention period.
@@ -393,4 +393,4 @@ class AlertHistory:
         # Note: Individual alert records will expire via TTL
         # Wallet/market indexes will also expire via TTL
         logger.info(f"Cleaned up {removed} old alert references")
-        return removed
+        return int(removed)