Revert "feat: wire RooMessage storage into Task.ts and all providers"

[mrubens]

Reverts #11386

Important

Migrated the entire codebase from custom RooMessage types to Anthropic SDK message types, replacing dual-format message handling with direct Anthropic.Messages.MessageParam usage and introducing a centralized convertToAiSdkMessages function for message conversion.

Message Type Migration

• Type System Overhaul: Replaced custom RooMessage type with Anthropic.Messages.MessageParam throughout the codebase, removing dual-format message handling that supported both AI SDK and legacy Anthropic formats.
• Removed Custom Types: Eliminated RooMessage, RooRoleMessage, UserContentPart, ContentBlockParam, LegacyToolUseBlock, LegacyToolResultBlock, AnyToolCallBlock, and AnyToolResultBlock type definitions and their associated helper functions from task-persistence module.
• Centralized Message Conversion: Introduced convertToAiSdkMessages function as the single point for converting messages to AI SDK format, replacing scattered type assertions across provider implementations.

Tool Block Format Changes

• Tool Call Blocks: Changed from custom "tool-call" type with toolCallId/toolName properties to Anthropic "tool_use" type with id/name properties.
• Tool Result Blocks: Changed from custom "tool-result" type with toolCallId/output structure to Anthropic "tool_result" type with tool_use_id/content properties and is_error boolean.
• Image Blocks: Updated image structure from flat format with image and mimeType properties to nested source object with type, data, and media_type properties.

Provider Updates

• All Provider Classes (anthropic.ts, azure.ts, bedrock.ts, openai.ts, gemini.ts, ... and 20+ others): Updated createMessage method signatures to accept Anthropic.Messages.MessageParam[] instead of RooMessage[], replaced direct type casting with convertToAiSdkMessages function calls.
• Cache Control Methods: Updated applyCacheControlToAiSdkMessages and applyCachePointsToAiSdkMessages methods in Anthropic and Bedrock providers to accept original messages and properly map cache control to converted AI SDK messages.
• Message Filtering: Simplified message filtering logic by removing custom type guards and using direct Anthropic type checks.

Core Message Processing

• Task.ts: Replaced pendingToolResults array with direct storage in userMessageContent array, updated pushToolResultToUserContent to work with Anthropic.ToolResultBlockParam, changed apiConversationHistory type from RooMessage[] to ApiMessage[].
• Message Merging: Updated mergeConsecutiveApiMessages.ts to work directly with Anthropic types, removed special handling for RooReasoningMessage.
• Tool Result Validation: Refactored validateToolResultIds.ts to use Anthropic SDK types directly, replaced helper function calls with direct property access.
• Condense Logic: Updated condense/index.ts to work with ApiMessage and Anthropic block types, simplified tool block processing by removing helper functions.

Message Content Processing

• Image Cleaning: Updated image-cleaning.ts to use ApiMessage type and work with Anthropic image block format.
• OpenAI Format Conversion: Completely refactored openai-format.ts to accept Anthropic.Messages.MessageParam[] instead of RooMessage[], removed legacy format handling, simplified message processing logic.
• User Content Mentions: Updated processUserContentMentions.ts to handle Anthropic.Messages.ContentBlockParam[] and added comprehensive support for tool_result blocks with both string and array content.
• Response Formatting: Updated responses.ts to return Anthropic SDK types (Anthropic.TextBlockParam, Anthropic.ImageBlockParam) instead of custom types.

Test Updates

• Provider Tests: Updated 25+ provider test files to use Anthropic.Messages.MessageParam[] type annotations instead of RooMessage[], updated test data structures to match Anthropic SDK format.
• Core Tests: Updated tests in condense, context-management, task, and assistant-message modules to use ApiMessage type and Anthropic block format, removed type assertions where proper typing is now available.
• Tool Result Tests: Updated test data to use tool_result type with tool_use_id and content properties instead of custom format.

Type Safety Improvements

• Removed Type Assertions: Eliminated numerous as any type assertions throughout the codebase by using proper Anthropic SDK types.
• Improved Type Inference: Replaced explicit type casts with TypeScript's type inference where types are now properly defined.
• Better Type Guards: Simplified type checking by using direct property access and Anthropic SDK type checks instead of custom helper functions.

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[linear]

Issue reopened: EXT-647 Implement ModelMessage storage layer

[roomote]

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