[codex] fix(config): remove flat results remote alias

[christso]

Summary

• Reject flat results.remote in persisted config parsing/validation instead of treating it as a local Git remote-name alias.
• Hard-deprecate legacy projects[].results.remote: registry loading ignores the whole results block when that removed field is present, and registry saving never serializes it.
• Update docs and stale examples to use nested results.repo.remote as the endpoint URL, omit persistent require_push, and omit default push_conflict_policy.

Migration and compatibility

• Move old same-repo config from flat results.repo_path/results.branch plus results.remote: origin to results.repo.path, results.repo.branch, and an endpoint URL in results.repo.remote when portability is needed.
• Do not configure a local alias in persisted config. Existing checkouts may still use their configured origin internally for fetch/push.
• results.sync.require_push remains a per-run CLI concern via --results-require-push, not persistent config.
• Existing project registry entries containing flat results.remote now load without a results repo configuration for that project until the config is manually corrected. This is intentional hard deprecation for an unreleased/PR surface rather than a warning-period migration.

Validation

• bun test packages/core/test/evaluation/loaders/config-loader.test.ts
• bun test packages/core/test/evaluation/validation/config-validator.test.ts
• bun test packages/core/test/projects.test.ts
• bun test apps/cli/test/commands/results/remote-auto-export.test.ts
• bun --filter @agentv/core typecheck
• bun --filter @agentv/core build
• bun --filter agentv typecheck
• bun --filter agentv build
• bun run typecheck:workspace
• bun run lint
• bun run validate:examples

Follow-up hard-deprecation validation also reran project registry, loader, and validator tests, bun --filter @agentv/core typecheck, and bun run lint.

Refs av-6t2e

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