[EPIC] Extensible Install Contracts

Issue Tracking work for the extensible install meta-workstream for workstream-to-workstream contracts

Contracts

Contract	Issue
Component flag	#3167
Install settings	#3172
Release layout	#3176
Settings change and removal mechanism	#3663
Bootstrap interface	#3175
Database identity setup	#3184
Sizing	#3168
Stable patch targets	#3188
Helm values	#3186 (sub-issue of #3170)
Release coordinates	#3664
Object-store plugin interface	#3665
`ate-setup` interface for provider installers	#3189

Decisions that block contracts

Decision	Contracts	Status
Neutral OpenTelemetry default	Install settings	Open (#1258)
Credential-provider default: keep GKE host paths, or no provider	Install settings, Stable patch targets, Helm values	Open (#2669, #3667)
Restart mechanism that keeps object names stable	Settings change and removal mechanism	Open (#3663)
Upgrade stage for ate-idp-server and bundled Postgres	Release layout	Resolved in #2891: `4-apiserver`
Release bundle committed on the tag, or published as an OCI artifact	Release layout, Release coordinates	Open (#3176, #3664)
Image and chart hosting, and anonymous pull, during the CNCF repository transfer	Release coordinates	Images publish to GHCR from v1.0.0-rc.1; charts open (#3664)
Helm upgrades as per-stage charts or one chart with a staged procedure	Release layout, Helm values, Release coordinates	Open (#3170)
Which sizing fields may be unmanaged	Sizing, Helm values	Open (#3168)
Whether an S3-compatible backend stays in core, and where the GCS plugin lives	Install settings, Object-store plugin interface	Open (#3675, ai-on-gke/substrate-gke#159)

Parent Issue: #3158

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