[opencode] Add reasoning options

[rekram1-node]

Summary

• add normalized reasoning controls to all 63 OpenCode Zen model gaps
• map effort sets to the exact OpenAI, Anthropic, Google, and OpenAI-compatible routes used by Zen
• mark aliased or fixed-reasoning presets as fixed-control and avoid unbounded token budgets

Coverage

• 65 reasoning-capable models total
• 43 effort-controlled models
• 1 toggle-controlled model
• 21 fixed-control models
• 0 token-budget controls

Validation

• bun validate
• git diff --check
• complete coverage and zero-budget assertions