fix: repair broken helper paths across display, cache, odds, logging, resolver, repos, config, validator

Nine fixes for bugs surfaced while writing coverage for previously
untested modules (plus the bool-duration quirk pinned in PR #441):

- base_plugin.get_display_duration: exclude bools from both numeric
  branches — display_duration=True no longer reads as a 1-second slot;
  it falls through to config, then the 15.0 default.
- display_helper: draw_error_message/draw_no_data_message called
  _draw_centered_text with the wrong arguments and crashed with
  AttributeError — both now delegate to draw_centered_text.
  draw_scorebug_layout drew status and clock at the same y, overprinting
  each other — they now share one combined top line.
  draw_ticker_layout drew its text starting at x=display_width (fully
  off-canvas), returning a blank frame every time — now draws at x=0;
  scroll_speed stays accepted-but-unused and is documented as such.
- api_helper.clear_cache guarded on a nonexistent CacheManager.clear()
  method, silently never clearing anything; it now uses the real surface
  (clear_cache/delete/list_cache_files) and no-ops safely otherwise.
- base_odds_manager._extract_espn_data raised AttributeError when ESPN
  sent explicit JSON nulls ("homeTeamOdds": null) — every level now
  null-safes with 'or {}'. format_odds_summary gated on
  is_odds_available, which deliberately ignores money lines, so
  ML-only odds formatted as "No odds available" — it now gates only on
  empty/no_odds data and formats money lines.
- logging_config.ContextualFormatter mutated record.msg in place, so a
  second handler prepended the context prefix twice; it now formats a
  copy. log_error hardcoded exc_info=True and raised TypeError when the
  caller passed exc_info — now kwargs.setdefault.
- dynamic_team_resolver wrote its "shared" class cache through self,
  creating instance shadows — the cache was per-instance and every
  scoreboard refetched rankings. Writes now go through the class.
- saved_repositories cleaned URLs with an unanchored .replace('.git','')
  that mangled URLs merely containing '.git' (my.github.io -> myhub.io);
  now strips only a trailing suffix. add/remove also roll back the
  in-memory list when the save fails, so memory always matches disk.
- config_helper.merge_configs shallow-copied the base, aliasing every
  un-overridden nested dict into the result — now deep-copies.
- startup_validator.validate_all accumulated errors/warnings across
  calls — now resets both lists per run.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NohXi78cwsAKtN1sCfxjUh

src/plugin_system/base_plugin.py

@@ -364,8 +364,10 @@ class BasePlugin(ABC):
                 # Handle None case
                 if duration is None:
                     pass  # Fall through to config
-                # Try to convert to float if it's a number or numeric string
-                elif isinstance(duration, (int, float)):
+                # Try to convert to float if it's a number or numeric string.
+                # bool is excluded: it's an int subclass, and True would
+                # otherwise read as a 1-second duration.
+                elif isinstance(duration, (int, float)) and not isinstance(duration, bool):
                     if duration > 0:
                         return float(duration)
                     else:
@@ -403,8 +405,9 @@ class BasePlugin(ABC):
         # Fall back to config
         config_duration = self.config.get("display_duration", 15.0)
         try:
-            # Ensure config value is also a valid float
-            if isinstance(config_duration, (int, float)):
+            # Ensure config value is also a valid float (bool excluded — an
+            # int subclass that would otherwise read True as 1 second)
+            if isinstance(config_duration, (int, float)) and not isinstance(config_duration, bool):
                 if config_duration > 0:
                     return float(config_duration)
                 else: