ci: auto-heal spec-sync PRs by regenerating the models

[wei-hai]

What

Adds a Sync spec auto-heal workflow that eliminates the manual generate step on the automated spec-sync PRs.

Why

The spec-sync automation opens a PR that updates only the vendored spec/openapi.yaml, not the generated client. The drift check then fails on every sync PR until a maintainer checks out the branch, regenerates, and commits. This makes that automatic.

How

• Triggers only on chore/sync-v2-spec-* branches (ordinary PRs untouched).
• Regenerates the low layer and, if it changed, commits and pushes back onto the PR branch — so CI re-runs and the drift check goes green.
• No drift ⇒ nothing pushed ⇒ cannot loop.
• Push uses a SPEC_SYNC_TOKEN secret (contents:write) instead of the default GITHUB_TOKEN, because a GITHUB_TOKEN push does not re-trigger required checks (GitHub's recursive-run guard). Workflow-level permissions stay contents: read.

Setup required

Add a SPEC_SYNC_TOKEN repo secret — a fine-grained PAT (or app token) with contents:write on this repo. Until it exists, the job fails fast with an actionable message and nothing else changes.

Verified

Hygiene scanner + YAML parse pass. The regen command mirrors the drift check exactly (byte-for-byte), so it produces precisely what the check expects.

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 0b062aba-133c-4876-9f35-01b5aed1b7d4

📥 Commits

Reviewing files that changed from the base of the PR and between 1d8d09b and 1a656ed.

📒 Files selected for processing (1)

• .github/workflows/sync-autoheal.yml

Warning

.coderabbit.yaml has a parsing error

The CodeRabbit configuration file in this repository has a parsing error and default settings were used instead. Please fix the error(s) in the configuration file. You can initialize chat with CodeRabbit to get help with the configuration file.

💥 Parsing errors (1)

Validation error: Too big: expected string to have <=250 characters at "tone_instructions"

⚙️ Configuration instructions

• Please see the configuration documentation for more information.
• You can also validate your configuration using the online YAML validator.
• If your editor has YAML language server enabled, you can add the path at the top of this file to enable auto-completion and validation: # yaml-language-server: $schema=https://coderabbit.ai/integrations/schema.v2.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/spec-sync-autoheal

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch ci/spec-sync-autoheal

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