feat: improve scope up and down command & parse-prd improvements (#1079)

* feat: improve scope up and down command & parse-prd improvements

* chore: run format

.changeset/fuzzy-words-count.md

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+---
+"task-master-ai": patch
+---
+
+Fix scope-up/down prompts to include all required fields for better AI model compatibility
+
+- Added missing `priority` field to scope adjustment prompts to prevent validation errors with Claude-code and other models
+- Ensures generated JSON includes all fields required by the schema

.changeset/tender-trams-refuse.md

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+---
+"task-master-ai": patch
+---
+
+Fix MCP scope-up/down tools not finding tasks
+
+- Fixed task ID parsing in MCP layer - now correctly converts string IDs to numbers
+- scope_up_task and scope_down_task MCP tools now work properly

.changeset/vast-sites-leave.md

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+---
+"task-master-ai": patch
+---
+
+Improve AI provider compatibility for JSON generation
+
+- Fixed schema compatibility issues between Perplexity and OpenAI o3 models
+- Removed nullable/default modifiers from Zod schemas for broader compatibility
+- Added automatic JSON repair for malformed AI responses (handles cases like missing array values)
+- Perplexity now uses JSON mode for more reliable structured output
+- Post-processing handles default values separately from schema validation