Make max snapshot artifacts limit configurable (#386)

* Make max snapshot artifacts limit configurable

Add `database.max_snapshot_artifacts` config option to control how many
program artifacts are included in worker process snapshots. Default
remains 100 for backward compatibility.

- Set to a higher number to include more artifacts in prompts
- Set to `null` (None) for unlimited artifacts (use with caution for
  large populations as this can significantly increase memory usage)

Note: This limit only affects artifacts passed to worker processes,
not the total artifacts stored. All program code is always available
regardless of this setting.

Closes #383

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add tests for recent features

Add comprehensive tests for recently merged PRs:

- test_llm_config_optional_params.py: Tests for optional temperature/top_p
  parameters (PR #385 - Anthropic model compatibility)

- test_snapshot_artifacts_limit.py: Tests for configurable max_snapshot_artifacts
  (PR #386)

- test_visualization_sanitization.py: Tests for -inf/+inf/NaN sanitization
  in visualization (PR #384)

- test_early_stopping_config.py: Tests for event-based early stopping
  configuration (PR #375)

- test_changes_description.py: Tests for large codebase support via
  changes description (PR #376)

Total tests increased from 264 to 326.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add integration tests for example validation

Add comprehensive integration tests that verify:
- Example config files load correctly
- Initial programs have EVOLVE-BLOCK markers
- Evaluators exist and have required functions
- Evaluators can run on initial programs
- Cascade evaluation functions are detected
- Database stores and retrieves programs correctly
- Program evolution tracking works

Tests cover function_minimization, circle_packing, and signal_processing
examples, plus general structure validation for all examples.

Total tests: 346 (was 326)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Merge pull request #363 from FunMelon/refactor-template-prompt

refactor(prompt): Replace hardcoded strings with template fragments

Merge pull request #358 from algorithmicsuperintelligence/fix-new-rel…

…ease

bump version for new release

Merge pull request #345 from algorithmicsuperintelligence/fix-better-…

…prog-calculation

Update controller.py

Merge pull request #329 from algorithmicsuperintelligence/fix-key-emb…

…edding-model

Fix key embedding model

Merge pull request #328 from algorithmicsuperintelligence/fix-embeddi…

…ng-async-error

Fix embedding async error

Merge pull request #322 from algorithmicsuperintelligence/fix-max-tok…

…en-bug

Simplify reasoning model detection logic

Merge pull request #310 from algorithmicsuperintelligence/feat-new-re…

…lease

Update _version.py

Merge pull request #292 from codelion/codelion-patch-1

Update _version.py

Merge pull request #280 from codelion/fixes-islands

Fixes islands