Missing config.toml file should not error

[neekolas]

When a push to main comes in for a repo that does not have a file in .code-factory/config.toml we should not error the workflow. Make it set an empty config file instead.

[xmtp-coder-tasks]

Task is running: https://sandbox.xmtp.team/tasks/neekolas/f7037143-dbd4-4c94-ad8e-b7ac22b0424c

[xmtp-coder-agent]

Bugfix Spec

Current Behavior

When a push to the default branch arrives from a repository with no .code-factory/config.toml, runSyncRepoConfig only runs fetch-config-file. getRepoContentFile returns null (404), the !fileResult.present branch logs "No repo config file present; skipping DO write" and returns early — no write to RepoConfigDO.

Downstream, runCreateTask calls stub.getRepoConfig(), gets null, and falls back to the legacy template path: prompt: event.issue.url with no templateName, bypassing the new code-factory template. Repos without a config file never reach the new template.

Expected Behavior

When .code-factory/config.toml is absent at the pushed head SHA:

• fetch-config-file runs as before.
• Instead of returning early, the workflow proceeds to store-repo-config with an empty settings object (settings: {}). parse-and-validate is skipped (no content to parse).
• RepoConfigDO.setRepoConfig is invoked with { repositoryId, repositoryFullName, installationId, settings: {} }.
• Downstream getRepoConfig() returns a non-null RepoConfig with defaults: sandbox.size="medium", sandbox.docker=false, sandbox.volumes=[], harness.provider="claude_code", scheduled_jobs=[].
• Workflow completes successfully.

Unchanged Behavior

• File-present happy path: fetch → parse → store.
• Invalid TOML / Zod failures on a present file: still throw NonRetryableError from parse-and-validate.
• Non-default-branch pushes: still skipped at routePush.
• RepoConfigDO, StoredRepoConfigSettingsSchema, resolveRepoConfigSettings, buildTemplateInputs, and runCreateTask's template selection are unchanged.

[neekolas]

I changed my mind on the behavior. Instead, let's simply return early when no config is present