fix(fs): close read-image review gaps

packages/support/llm-replay/tests/llm-replay.spec.ts

@@ -7,6 +7,7 @@ import type { SessionEvent } from '@deepseek-ai/dsh-session'
 import { CompactionId } from '@deepseek-ai/dsh-compact'
 import LlmService, { CallId, createUserMessage, GenerateOptions, LlmAdapter, StreamChunk } from '@deepseek-ai/dsh-llm'
 import {
+  type Config,
   type ReplayEntry,
   type SessionScript,
   apply,
@@ -1097,11 +1098,31 @@ describe('apply (the plugin entry)', () => {
     writeFileSync(file, sessionJsonl(TEXT_CHUNKS.map((c, i) => chunkEvent(i + 1, 1, 1, c))), 'utf8')
     const ctx = new Context()
     await ctx.plugin(LlmService)
-    apply(ctx, { file, providers: [{ id: 'm', models: [{ id: 'm' }] }], paceMs: 1 })
-    expect(ctx.llm.listProviders()).toEqual([{ id: 'm', name: 'm' }])
+    apply(ctx, {
+      file,
+      providers: [
+        { id: 'm', models: [{ id: 'm', inputModalities: ['image'] }, { id: 'text' }] },
+        { id: 'empty' },
+      ],
+      paceMs: 1,
+    })
+    expect(ctx.llm.listProviders()).toEqual([{ id: 'm', name: 'm' }, { id: 'empty', name: 'empty' }])
+    await expect(ctx.llm.resolveModelInfo('m', 'm')).resolves.toMatchObject({ inputModalities: ['image'] })
     expect(await drain(ctx.llm.stream({ provider: 'm', model: 'm', messages: [] }))).toEqual(TEXT_CHUNKS)
   })
 
+  it.each([
+    ['a string', 'image'],
+    ['an unknown modality', ['audio']],
+  ])('rejects inputModalities configured as %s during load', (_case, inputModalities) => {
+    const ctx = new Context()
+    const providers = [{ id: 'm', models: [{ id: 'm', inputModalities }] }] as unknown as
+      NonNullable<Config['providers']>
+    expect(() => { apply(ctx, { file, providers }) }).toThrow(
+      'llm-replay: provider "m" model "m" inputModalities must be an array containing only "text" and "image"',
+    )
+  })
+
   it('falls back to $DSH_SNAPSHOT_FILE / $DSH_SNAPSHOT_OVERRIDE when config is empty', async () => {
     writeFileSync(file, sessionJsonl([]), 'utf8')
     const overrideFile = join(dir, 'replay.override.json')