feat(dsh-plugin-browserskill): host-side ObservationService for the PiP overlay (Phase 1-A)

Per-session live observation for owned sessions only, feeding the
upcoming client overlay:

- State model: SessionObservation (sessionId/url/action/since/
  thumbnailAttachmentId/lastError), one entry per owned session;
  added on start, removed on stop, cleared on dispose.
- Instrumentation: the shared runBsk wrapper begins/ends an action
  (tool name mapped to a verb) around every model-facing call and tags
  the child with its session id; action end triggers an immediate
  thumbnail refresh.
- Thumbnail loop: 1.5s cadence while active, 8s idle downclock, x3
  failure backoff, silent frame retention on errors; captures run
  OUTSIDE the instrumentation (no action events, no current-pointer
  movement) and land in the attachment store by reference.
- Interrupt: runner.killFor(tag) kills exactly the tagged in-flight bsk
  children — chat-Stop-equivalent semantics for the current or a named
  owned session; foreign ids and the no-in-flight case return false.
- Remote seam: dsh 0.1's Typert Remote pipeline and forwarded-event
  allowlist are closed to out-of-tree packages, so state/events/
  interrupt are served over the documented webServer route seam:
  GET /bsk-observation/state, GET /bsk-observation/events (SSE),
  POST /bsk-observation/interrupt; routes mount only when a webServer
  service exists (headless compositions skip them).
- Config: observationEnabled (true), thumbnailIntervalMs (1500),
  idleIntervalMs (8000).

Tests (+13, 72 total): state machine + event stream, cadence fast/idle/
backoff, headless no-store silence, observation-traffic isolation,
interrupt routing (default/specified/none/foreign), HTTP route
handlers, disabled-webServer no-op.

packages/dsh-plugin-browserskill/tests/dispose.test.ts

@@ -58,6 +58,7 @@ describe("dispose cleanup ownership", () => {
         return fail(`unexpected command: ${joined}`);
       },
       killAll() {},
+      killFor: () => 0,
     };
     const tools = new Map<string, ToolDefinition>();
     const disposers: Array<() => Promise<void>> = [];