Rename AlphaEvolve strategy to OpenEvolve and credit the inspiration

[Copilot]

The alphaevolve strategy was misnamed — the playbook was modeled on algorithmicsuperintelligence/openevolve (the open-source implementation), not directly on DeepMind's AlphaEvolve paper. This PR renames it and adds proper attribution.

Renames (via git mv, history preserved)

• .autoloop/strategies/alphaevolve/ → .autoloop/strategies/openevolve/ (incl. strategy.md, CUSTOMIZE.md, prompts/)
• .autoloop/programs/tsb-perf-evolve/strategy/alphaevolve.md → openevolve.md

Text replacements

• AlphaEvolve → OpenEvolve and alphaevolve → openevolve across 12 files: the renamed strategy/playbook/prompts, all tsb-perf-evolve files (program.md, code/README.md, code/config.yaml, strategy/prompts/*), .github/workflows/autoloop.md, and the test-driven/CUSTOMIZE.md cross-reference.
• The only surviving AlphaEvolve mentions are deliberate — inside the new attribution block, crediting the paper.

Attribution block

Added at the top of .autoloop/strategies/openevolve/strategy.md and CUSTOMIZE.md, immediately after the title:

> **Inspiration.** This strategy is modeled on [OpenEvolve](https://github.com/algorithmicsuperintelligence/openevolve) — an open-source implementation of the evolutionary-code-search approach popularized by DeepMind's AlphaEvolve paper. We've adapted the core ideas (MAP-Elites niching, island model, four operators — exploitation / exploration / crossover / migration) into a playbook the autoloop agent follows at iteration time. Consult the OpenEvolve repo for background on the underlying algorithm and worked examples.

program.md pointer block

Updated tsb-perf-evolve/program.md Evolution Strategy section to:

This program uses the **OpenEvolve** strategy (modeled on [openevolve](https://github.com/algorithmicsuperintelligence/openevolve)). On every iteration, read `strategy/openevolve.md` and follow it literally …

Support files list also repointed to strategy/openevolve.md.

Out of scope

State files on the memory/autoloop branch are left as-is per the issue — that's iteration history, not behavior, and future entries will pick up the new name naturally.