fix(web): return every service a host row injects, and run the browser lane

The browser e2e lane had been failing wholesale since this stack moved the
agent plane into presets, and nothing caught it: 34 of 48 files. Two of the
causes are product defects, not test breakage.

`bashEnv` goes back to the host plane. `apps/cli/src/web.ts` injects it to
publish `DSH_WEB_URL`/`DSH_WEB_MODE`, so the earlier note that "nothing outside
the agent plane injects bashEnv" was simply wrong — behind a preset's `shell`
realm those variables reached no shell at all, and a `dsh web` agent could not
find the address of its own interface. This is the same criterion that returned
`subagents`: a host row that injects a service resolves before any session
exists and has no agent to key by, so the service is host-plane. `tool-bash`
consumes the host registry from inside the preset, which works because an
agent context chains to the host; only the reverse is invisible.

`tool-subagent-report` goes back with it. It is not a tool this agent calls: it
registers a continuable SETUP on the host `subagents` singleton, and that list
is not scope-aware. One copy per mounted preset meant every child was handed
`report` once per live session, so the second registration threw and a cold
subagent resume failed with `subagent-not-resumable` — a diagnostic three
layers removed from the cause.

The lane's own composition facts follow. Skill roots resolve inside a preset
now, a subtree include patches cannot reach, so the scaffold pins the roots'
documented environment fallback for its whole lifetime rather than for the boot
— presets mount per session. Without it the developer's real `~/.dsh/skills`
enters replay requests and goldens while CI sees none. The `apps/cli`
composition test pins `storage-json` for the same reason: unpinned it wrote,
and then read back, the developer's own `~/.dsh/storages/`.

Three tests now address through an agent what they used to read off the root
context, because that is where the thing lives: the tool catalog, the skill
registry, and the token meter. The seeded-history projection baseline asserts
the opposite of what it did — a detached session yields a preset-plane
projection only from a durable checkpoint written while it was live, and this
seed was written straight to persistence and never ran.

Goldens re-recorded for the hero's preset chip and the settings nav entry.

apps/web/tests/shipped-composition.e2e.ts

@@ -11,6 +11,8 @@ import type {} from '@deepseek-ai/dsh-tools'
 import type {} from '@deepseek-ai/dsh-sandbox-policy'
 import type {} from '@deepseek-ai/dsh-user-approval'
 import type {} from '@deepseek-ai/dsh-permission'
+import { SessionId } from '@deepseek-ai/dsh-session'
+import type {} from '@deepseek-ai/dsh-agent-presets'
 import { launchWebScaffold, type WebScaffold } from './scaffold.ts'
 
 /**
@@ -63,11 +65,26 @@ afterEach(async () => {
 
 it('assembles the shipped Web catalog with the confined access default', async () => {
   scaffold = await launchWebScaffold()
-  const names = scaffold.ctx.tools.schemas().map(schema => schema.name).sort()
-  expect(names.filter(name => !RIPGREP_TOOLS.includes(name))).toEqual(EXPECTED_TOOLS)
-  // The packaged ripgrep binary ships with the dependency, so the pair is a
-  // fixed roster member on every host.
-  expect(names.filter(name => RIPGREP_TOOLS.includes(name))).toEqual(RIPGREP_TOOLS)
+  const ctx = scaffold.ctx
+  // The catalog belongs to an AGENT, not to the process: every model-facing row
+  // now lives in a preset mounted under one session's scope, so the global
+  // layer holds nothing and a caller must name the agent to see anything. This
+  // composes from the deployment default — what a session that names no preset
+  // gets — which is the shape this test has always been about.
+  expect(ctx.tools.schemas().map(schema => schema.name)).toEqual([])
+  const handle = await ctx.agents.create({
+    sessionId: SessionId('shipped-composition'),
+    setup: agentCtx => ctx.agentPresets.mount(agentCtx).then(() => undefined),
+  })
+  try {
+    const names = ctx.tools.schemas(handle.agent).map(schema => schema.name).sort()
+    expect(names.filter(name => !RIPGREP_TOOLS.includes(name))).toEqual(EXPECTED_TOOLS)
+    // The packaged ripgrep binary ships with the dependency, so the pair is a
+    // fixed roster member on every host.
+    expect(names.filter(name => RIPGREP_TOOLS.includes(name))).toEqual(RIPGREP_TOOLS)
+  } finally {
+    await handle.dispose()
+  }
   // `workspace-write` is not "the workspace and nothing else": the shared roots
   // helper always admits the temp directories too. Pinning it against an
   // explicit mode keeps the claim independent of this surface's default, and