API 0.3 removal inventory

The 0.44 release introduces these deprecations. They remain callable until the 0.45 breaking release. Do not remove an item until its deprecation has shipped in a stable SDK. See API versioning. Other PS-807 and PS-806 additions extend this inventory in their owning PRs.

Deprecated surface	Replacement	Last maintained caller	Data conversion	Removal
/extensions capability constants (WEBVIEW_*, ALWAYS_AVAILABLE_WEBVIEW_CAPABILITIES)	Hosts import from pstdio-api-contracts; authors use the typed webview client	Host imports migrated in PS-806 N	None	0.45
/extensions EXTENSION_EVENTS_SCOPE, resolveEventReferenceId, artifactMountId	Host contract exports	Host imports migrated in PS-806 N	None	0.45
/extensions qualifyNavigationTarget, page params and URL helpers, defaultPageResourceCodec, URL helper types, resolveDataTable*, mergeOrderedHistory	Host contract exports	Host imports migrated in PS-806 N	None	0.45
/extensions and /client AssetReference, AssetTransfer aliases	/resources	Existing external consumers may remain; in-repo code can import the canonical type	None	0.45
/extensions and /api notification type aliases	/resources	Existing external consumers may remain; command and client result types stay compatible	None	0.45
/hooks entry	Typed extension hooks and the regular SDK client	No extension caller	None	0.45
/client workspace/session listActivity	Their GET activity HTTP endpoints; use session queries for session history	None in repository source	None; HTTP paths stay available	0.45
/client sessions getConversationSources	GET session conversation sources HTTP endpoint	None in repository source	None; HTTP path stays available	0.45
/client skills updatePreferences	PUT project skill HTTP endpoint	None in repository source	None; HTTP path stays available	0.45

| ctx.notify.resolve, ctx.notify.dismiss, author expired | setStatus and setStatusByKey with done or dismissed; expiry stays host-owned | Planner, Reports and external consumers use the compatibility adapters until 0.45 adoption | None | 0.45 | | notification.action, .resolve, .dismiss bridge capabilities and parameter types | Invoke a command using ctx.notify; keep notification.show for toasts | Internal workbench fixture uses .action; no maintained extension callers | None | 0.45 | | HTTP notification /read, /done, /dismiss, /snooze, /resolve-by-dedupe-key; matching SDK methods | POST /:id/status and /status-by-key; SDK setStatus and setStatusByKey | CLI and dashboard compatibility callers; external consumers unknown | None | 0.45 | | HTTP PATCH notifications/:id snoozedUntil, UpdateNotificationInput.snoozedUntil | Status route with status: "snoozed" and a timestamp | External consumers unknown | None | 0.45 | | Unpaged HTTP GET /v1/sessions, SDK sessions.list and ListSessionsInput | GET /v1/projects/:projectId/sessions; SDK query or iterate with ExtensionSessionQuery | CLI session listing; external consumers unknown | None | 0.45 |

host.dispatchKeyboardEvent is private guest plumbing, outside the public capability union. Keyboard forwarding continues through the private runtime path and requires no declaration.

The API report covers the eight public SDK subpaths from api-report-entries.json. /hooks is host-only and deprecated. Export aliases keep their existing type and runtime behavior for the window above. The 0.45 removal must inspect both SDK exports and real HTTP/bridge registrations.