feat(cli): add *.eval.ts auto-discovery

[christso]

Summary

Adds auto-discovery and execution of *.eval.ts files alongside YAML evals. Each TS file exports an EvalConfig and runs through evaluate() with the same output/artifact pipeline.

Closes #1116
Depends on #1119 (#1115)

Changes

New: TS Eval Loader (packages/core/src/evaluation/loaders/ts-eval-loader.ts)

• Loads *.eval.ts via dynamic import() (native in Bun)
• Tries exports in priority order: default, config, evalConfig
• Clear error when no valid EvalConfig export found

Discovery (apps/cli/src/commands/eval/shared.ts)

• Extension regex and auto-glob include .ts
• Default patterns: **/evals/**/*.eval.ts added

Format Detection (packages/core/src/evaluation/loaders/jsonl-parser.ts)

• detectFormat() returns 'typescript' for .ts/.mts

CLI Integration (apps/cli/src/commands/eval/run-eval.ts)

• TS files separated from YAML files and processed via evaluate()
• CLI options forwarded: --workers, --threshold, --filter, --cache, --verbose, --max-retries, --agent-timeout
• Results flow through same artifact writer and reporter
• Tag filtering: TS files skipped when --tag/--exclude-tag active (TS files don't carry YAML tags)
• Boolean options correctly forwarded (uses !== undefined checks)

Tests

• 5 unit tests for loadTsEvalFile (default export, named exports, error case)
• Format detection tests for .ts extension
• resolveEvalPaths tests for .eval.ts inclusion
• All 475 tests pass

E2E Verification

Green (.eval.ts file discovered and executed):

$ bun apps/cli/src/cli.ts eval run greeting.eval.ts --dry-run
Running TS eval: greeting.eval.ts
RESULT: PASS  (1/1 scored >= 80%, mean: 100%)

Test Results

475/475 pass, 0 failures

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