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feat: add --effort support via model[:effort] syntax

Extends task_model/review_model config and --task-model/--review-model CLI
flags to carry Claude's --effort level using model[:effort] syntax (e.g.,
opus:high, :medium). Both parts are optional and independently usable.

- ClaudeExecutor gains Effort field; --effort is injected alongside --model
  and deduped from claude_args (handles --effort=val and bare --effort)
- ParseModelEffort helper splits spec on first colon; exported for external
  test package access
- Runner.New compares parsed (model, effort) tuples when deciding whether
  to build a separate review executor, so "opus" and "opus:" don't produce
  redundant executors
- Integration test verifies New wiring across 7 spec combinations, including
  same-model-different-effort (the main feature motivation)
- docs/custom-providers.md command template updated to show --effort
- Updated README, CLAUDE.md, llms.txt, config defaults, field godoc