docs: update TODO and ROADMAP with completed work

ROADMAP.md

@@ -221,17 +221,29 @@ PPF (Proxy Fetcher) is a Python 2 proxy scraping and validation framework design
 - [x] Make IP2Location optional (graceful fallback)
 - [x] Add --nobs flag for stdlib HTMLParser fallback (bs4 optional)
 
+### Rate Limiting & Stability (Done)
+- [x] InstanceTracker class in scraper.py with exponential backoff
+- [x] Configurable backoff_base, backoff_max, fail_threshold
+- [x] Exception logging with context (replaced bare except blocks)
+- [x] Unified _known_proxies cache in fetch.py
+
+### Monitoring & Maintenance (Done)
+- [x] Stats class in proxywatchd.py (tested/passed/failed tracking)
+- [x] Periodic stats reporting (configurable stats_interval)
+- [x] Stale proxy cleanup (cleanup_stale() with configurable stale_days)
+- [x] Timeout config options (timeout_connect, timeout_read)
+
 ---
 
 ## Technical Debt
 
 | Item | Description | Risk |
 |------|-------------|------|
-| Dual _known_proxies | ppf.py and fetch.py maintain separate caches | Medium - duplicates possible |
+| ~~Dual _known_proxies~~ | ~~ppf.py and fetch.py maintain separate caches~~ | **Resolved** |
 | Global config in fetch.py | set_config() pattern is fragile | Low - works but not clean |
 | No input validation | Proxy strings parsed without validation | Medium - could crash on bad data |
-| Silent exception catching | Some except: pass patterns hide errors | High - hard to debug |
-| Hardcoded timeouts | Various timeout values scattered in code | Low - works but not configurable |
+| ~~Silent exception catching~~ | ~~Some except: pass patterns hide errors~~ | **Resolved** |
+| ~~Hardcoded timeouts~~ | ~~Various timeout values scattered in code~~ | **Resolved** |
 
 ---