fix(results): remove selected run publish workflow

[christso]

Summary

• Removes the Dashboard Publish run / Replace published run action.
• Removes selected-run publish preview/client helpers, wire types, routes, and core overwrite helper exports.
• Keeps project-level Sync Project as the user-facing results exchange workflow.

Acceptance Evidence

• Local run detail no longer triggers a publish-preview path that clones/fetches/touches the remote results repo.
• Removed unscoped and project-scoped /api/.../runs/:id/publish GET/POST routes.
• Existing project-level sync tests still cover pull/push of results and dirty remote tag metadata.

Verification From Bead av-hbv.5

• bunx biome check on touched files
• git diff --check
• bun test packages/core/test/evaluation/results-repo.test.ts
• bun run build
• bun test apps/cli/test/commands/results/serve.test.ts
• bun run typecheck
• bun --filter @agentv/dashboard test
• bun run lint
• Pre-push hook reran typecheck and Biome successfully

Closes av-hbv.5.