test: add unit tests for eval-outcomes, objective-default-models, and mock-recommendations

[roomote]

Adds test coverage for the new utility modules introduced in #11444:

• eval-outcomes.ts: Tests for EVAL_OUTCOMES data integrity, isEvalOutcomeId(), and getEvalOutcomeBySlug()
• objective-default-models-v1.ts: Tests for pickObjectiveDefaultModelV1() across all outcome/mode combinations, verifying quality floor, speed, and cost optimization invariants
• mock-recommendations.ts: Tests for getEngineerRoles(), getEngineerRole(), getRoleRecommendation(), getAllRecommendations(), getCloudSetupUrl(), TASKS_PER_DAY, and MODEL_TIMELINE

28 tests total, all passing.

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[roomote]

Rooviewer   See task

Reviewed 3 new test files (28 tests). One suggestion:

• Derive ALL_OUTCOME_IDS from EVAL_OUTCOMES in objective-default-models-v1.test.ts to avoid silent coverage gaps when new outcomes are added (comment)

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[roomote]

ALL_OUTCOME_IDS is hardcoded here rather than derived from the source of truth. TypeScript enforces that each listed value is a valid EvalOutcomeId union member, but it does not enforce completeness -- if a new outcome is added to the union type, this array won't cause a compile error and the new outcome silently won't be tested. Consider deriving the list from EVAL_OUTCOMES.map(o => o.id) (imported from ../eval-outcomes) so coverage stays in sync automatically.

Suggested change

	import type { EvalOutcomeId } from "../eval-outcomes"
	const ALL_OUTCOME_IDS: EvalOutcomeId[] = [
	"prototype_to_pr",
	"paper_cuts",
	"sentry_triage",
	"repro_to_fix",
	"review_guardrails",
	"issue_to_pr",
	]
	import { EVAL_OUTCOMES } from "../eval-outcomes"
	const ALL_OUTCOME_IDS = EVAL_OUTCOMES.map((o) => o.id)

_{Fix it with Roo Code or mention @roomote and request a fix.}

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