Fix openrouter require_parameters flag not being supported by model providers

[piiq]

1. Resolves the issue that there are no model providers to process the request
2. Adds resilience mechanisms that prevent the bot from failing when one or multiple optimization models fail with initial optimization parameters

[Copilot]

Pull Request Overview

This PR fixes an OpenRouter issue where the require_parameters flag was causing model provider compatibility problems, and implements resilience mechanisms to prevent bot failures when portfolio optimization models encounter infeasible constraints.

• Removes require_parameters=True from OpenRouter model configurations to fix provider compatibility
• Modifies optimize_portfolio to handle individual model failures gracefully and return partial results
• Adds automatic constraint adjustment for infeasible optimization parameters

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
allocator_bot/agent.py	Removes require_parameters flag and adds failure handling for partial optimization results
allocator_bot/portfolio.py	Implements resilient optimization with individual model error handling and constraint validation
allocator_bot/prompts.py	Updates system prompts to handle partial optimization results and suggest constraint adjustments
tests/test_portfolio.py	Updates tests for new tuple return format and adds resilience testing
tests/test_agent.py	Updates mock data to include new Note column in allocation DataFrames
tasks/resiliense/RESILIENCE_PROPOSAL.md	Documents the resilience implementation proposal
tasks/resiliense/IMPLEMENTATION_SUMMARY.md	Summarizes the completed resilience implementation

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