Define deployment and release controls

### Description

Define a deployment and release-control model appropriate to the project’s actual hosting, environments, operational ownership, and rollback capability.

### Action Items

- [ ] Refine the scope by inventorying the current hosting, deployment, release, and environment model.
- [ ] Define environment boundaries, deployment approvals, credentials/secrets ownership, and protection rules where applicable.
- [ ] Define release validation, health checks, monitoring, rollback, and incident-response expectations.
- [ ] Evaluate whether GitHub Environments, deployment records, or release automation fit the project.
- [ ] Produce a phased implementation proposal with dependencies, costs, and operational owners before changing deployment controls.

### Additional Information

Status: Triage — contingent on confirming the project’s deployment architecture and operational ownership. Do not assume a specific hosting platform or release process.

Start by inventorying the project's current hosting, deployment, release, and environment model, along with operational ownership. Define environment boundaries, approvals, credential ownership, validation, monitoring, rollback, and incident-response expectations. Done means a phased implementation proposal documents dependencies, costs, operational owners, and whether GitHub Environments or release automation fit.

Written by the indexing model from the issue text.