fix(ai,tasks): Enhance AI provider robustness and task processing

This commit introduces several improvements to AI interactions and
task management functionalities:

- AI Provider Enhancements (for Telemetry & Robustness):
    - :
        - Added a check in  to ensure
          is a string, throwing an error if not. This prevents downstream
           errors (e.g., in ).
    - , , :
        - Standardized return structures for their respective
          and  functions to consistently include /
          and  fields. This aligns them with other providers (like
          Anthropic, Google, Perplexity) for consistent telemetry data
          collection, as part of implementing subtask 77.14 and similar work.

- Task Expansion ():
    - Updated  to be more explicit
      about using an empty array  for empty  to
      better guide AI output.
    - Implemented a pre-emptive cleanup step in
      to replace malformed  with
      before JSON parsing. This improves resilience to AI output quirks,
      particularly observed with Perplexity.

- Adjusts issue in commands.js where successfulRemovals would be undefined. It's properly invoked from the result variable now.

- Updates supported models for Gemini
These changes address issues observed during E2E tests, enhance the
reliability of AI-driven task analysis and expansion, and promote
consistent telemetry data across multiple AI providers.

scripts/modules/supported-models.json

@@ -99,34 +99,39 @@
 	],
 	"google": [
 		{
-			"id": "gemini-2.5-pro-exp-03-25",
+			"id": "gemini-2.5-pro-preview-05-06",
 			"swe_score": 0.638,
 			"cost_per_1m_tokens": null,
-			"allowed_roles": ["main", "fallback"]
+			"allowed_roles": ["main", "fallback"],
+			"max_tokens": 1048000
+		},
+		{
+			"id": "gemini-2.5-pro-preview-03-25",
+			"swe_score": 0.638,
+			"cost_per_1m_tokens": null,
+			"allowed_roles": ["main", "fallback"],
+			"max_tokens": 1048000
 		},
 		{
 			"id": "gemini-2.5-flash-preview-04-17",
 			"swe_score": 0,
 			"cost_per_1m_tokens": null,
-			"allowed_roles": ["main", "fallback"]
+			"allowed_roles": ["main", "fallback"],
+			"max_tokens": 1048000
 		},
 		{
 			"id": "gemini-2.0-flash",
 			"swe_score": 0.754,
 			"cost_per_1m_tokens": { "input": 0.15, "output": 0.6 },
-			"allowed_roles": ["main", "fallback"]
+			"allowed_roles": ["main", "fallback"],
+			"max_tokens": 1048000
 		},
 		{
-			"id": "gemini-2.0-flash-thinking-experimental",
-			"swe_score": 0.754,
-			"cost_per_1m_tokens": { "input": 0.15, "output": 0.6 },
-			"allowed_roles": ["main", "fallback"]
-		},
-		{
-			"id": "gemini-2.0-pro",
+			"id": "gemini-2.0-flash-lite",
 			"swe_score": 0,
 			"cost_per_1m_tokens": null,
-			"allowed_roles": ["main", "fallback"]
+			"allowed_roles": ["main", "fallback"],
+			"max_tokens": 1048000
 		}
 	],
 	"perplexity": [