fix(status): correct context percentage calculation and sync consolidator

- Pass resolved self.context_window_tokens to Consolidator instead of
  raw parameter that could be None, preventing consolidation failures
- Calculate percentage against input budget (ctx - max_completion - 1024)
  instead of raw context window, consistent with Consolidator/snip formulas
- Pass actual max_completion_tokens from provider to build_status_content
- Cap percentage display at 999 to prevent runaway values
- Add tests for budget-based percentage and cap behavior

nanobot/command/builtin.py

@@ -91,6 +91,9 @@ async def cmd_status(ctx: CommandContext) -> OutboundMessage:
             context_tokens_estimate=ctx_est,
             search_usage_text=search_usage_text,
             active_task_count=task_count,
+            max_completion_tokens=getattr(
+                getattr(loop.provider, "generation", None), "max_tokens", 8192
+            ),
         ),
         metadata={**dict(ctx.msg.metadata or {}), "render_as": "text"},
     )