refactor(experimental)!: classify optional packages and move prototypes

packages/README.md

@@ -55,7 +55,6 @@ Every package lives in exactly one group; new packages join existing groups, and
 | [`jobs/`](jobs/README.md) | Generic background-job runtime and model-facing job control tools |
 | [`experimental/`](experimental/README.md) | Pre-stable prototypes with explicit private exceptions |
 | [`workflow/`](workflow/README.md) | Workflow seam, PTC process engine, and model-facing `workflow`/`ralph` tools |
-| [`webhook/`](webhook/README.md) | Verified external events, trusted rules, and fire-and-forget Workspace Sessions |
 | [`web/`](web/README.md) | Web capability family: seam, search/fetch providers, model-facing web tools |
 | [`document/`](document/README.md) | Shared Host Office-to-PDF conversion |
 | [`attachment/`](attachment/README.md) | Durable attachment identity, validation, local content-addressed storage |
@@ -67,7 +66,6 @@ Every package lives in exactly one group; new packages join existing groups, and
 | [`bundle/`](bundle/README.md) | Installable `dsh --profile` patch layers |
 | [`extensions/`](extensions/README.md) | Agent runtime self-modification: live plugin/service inspection and model-written mount/unmount |
 | [`mcp/`](mcp/README.md) | External Model Context Protocol servers exposed as native tools |
-| [`hooks/`](hooks/README.md) | Hook bridges + the shared Claude Code / Codex wire-protocol library |
 | [`session/`](session/README.md) | Durable session data plane: persistence seam + backends, projection seam, log-backed titles, session reporting |
 | [`session-query/`](session-query/README.md) | Session retrieval family: logical corpus, bounded reads, lineage, semantic filtering, SQLite full-text search |
 | [`settings/`](settings/README.md) | User-settings seam + file-backed provider |
@@ -88,7 +86,7 @@ Every package lives in exactly one group; new packages join existing groups, and
 <a id="release-expectations"></a>
 ## Release expectations
 
-Most groups are product — stable API. The exceptions: `experimental/` publishes without stability or support promises, and `test-support/` and `util/` are support with lower compatibility expectations.
+Product groups have maintained product roles, while their public APIs remain pre-stable. [Experimental status](experimental/README.md#status) is independent of publication, installation, and optional delivery. Nonexperimental runtime packages must have product use or an explicit [package classification](../scripts/product-package-policy.ts); SDK, build, test, and declaration infrastructure have separate classifications.
 
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