PR 11: Remove public definition launch surfaces

[cm2435]

Review Guide

Stack position: PR 11, base codex/episode-sample-pr10-dashboard, head codex/episode-sample-pr11-delete-definition-runtime.

Implements RFC Docs

• Part of 09-implementation-plan/12-pr-11-delete-definition-runtime-path.md: public launch/API cleanup.
• Part of 09-implementation-plan/14-remediation-plan.md: definition launch surface cleanup.

Why This PR Exists

This PR removes the most visible public definition launch surfaces from the API, CLI-facing tests, routes, and docs. It is an important cleanup step, but the actual diff is narrower than the full destructive-migration section of the planning doc.

What Actually Changes

• Removes persist_benchmark from the root ergon_core.api export.
• Deletes POST /experiments/{definition_id}/run from core/infrastructure/http/routes/experiments.py.
• Updates sample CLI tests away from direct definition-backed SQLModel fixtures toward read-service fakes.
• Adds/updates route guards proving the removed definition-run route is unavailable.
• Updates the benchmark README to stop advertising persist_benchmark / definition-run flows.

Gotchas / Review Risks

• This PR should not be reviewed as the full destructive definition-runtime deletion unless the branch is updated. The diff reviewed by the subagent did not delete persistence/definitions, definition_writer.py, launch.py, definition columns, or the associated destructive migration.
• Definition persistence/runtime internals still remain in the stack at this point.
• The planning doc title overstates the current patch. Review the actual files changed, not just the PR name.
• At agent review time, dashboard e2e and three smokes were failing while Python unit/state, integration, lint/type, and frontend lint/type were passing.

Cleaned Later

• Full deletion of definition tables, bridge columns, definition writer/launch services, and old runtime tests must happen in a later cleanup/remediation patch if it is not added to this PR.
• PR 12 builds on the sample/experiment path for trainer rollouts.

Validation Notes

Focus validation on public API exports, removed REST route behavior, CLI/parser expectations, and documentation changes. Do not assume this PR has completed every destructive migration item from the RFC.

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[cm2435]

Closed after landing the cumulative episode/sample stack snapshot through PR132 directly onto dev in merge commit 1c22130. This PR's changes are included in dev.