refactor(lint): remove dead files and consolidate schema cluster from smell audit

- Delete 10 dead files left over from earlier fusion-lint split/rename commits, confirmed to have zero importers and no package.json export references:
  - cli-plugins/ai-index/src/bin/create-file-stream.ts (superseded by diverged, actively-used createFileStream$ in embed.ts)
  - cli/src/lib/app/{assert-package,resolve-app-package,resolve-entry-point}.ts
  - cli/src/lib/utils/{assert-file-exists,assert-git-repository,assert-number,assert-object-entries,fetch-multiple-package-info}.ts
  - react/router/src/routes/route-factories.ts
- Consolidate cli/src/bin/helpers/template-*-schema.ts (5 tiny mutually-referencing zod schema files) into template.schemas.ts

Verified via fusion-lint (0 warnings, 1203 files), tsc -b --force (cli, cli-plugin-ai-index, react-router), and vitest (19/19 passed).

Author: odinr

.changeset/cli-plugin-ai-index_remove-dead-create-file-stream.md

@@ -0,0 +1,5 @@
+---
+"@equinor/fusion-framework-cli-plugin-ai-index": patch
+---
+
+Internal: Remove dead `src/bin/create-file-stream.ts` left over from the fusion-lint file-splitting cleanup. Its `createFileStream` export had zero importers and was superseded by the actively-used, diverged local `createFileStream$` in `embed.ts`. No change to CLI behavior.

.changeset/cli_remove-dead-lint-split-files.md

@@ -0,0 +1,5 @@
+---
+"@equinor/fusion-framework-cli": patch
+---
+
+Internal: Remove dead code left over from the fusion-lint file-splitting cleanup — `src/lib/app/assert-package.ts`, `resolve-app-package.ts`, `resolve-entry-point.ts`, and `src/lib/utils/assert-file-exists.ts`, `assert-git-repository.ts`, `assert-number.ts`, `assert-object-entries.ts`, `fetch-multiple-package-info.ts` had zero importers and were not exported from any package entry point. Also consolidate the `src/bin/helpers/template-*-schema.ts` cluster (5 tiny mutually-referencing zod schema files) into a single `template.schemas.ts`. No change to the public API or CLI behavior.

.changeset/react-router_remove-dead-route-factories.md

@@ -0,0 +1,5 @@
+---
+"@equinor/fusion-framework-react-router": patch
+---
+
+Internal: Remove dead `src/routes/route-factories.ts` barrel file left over from the fusion-lint filename-convention cleanup. It had zero importers and was never wired into the package's public entry point. No change to the public API.

packages/cli-plugins/ai-index/src/bin/create-file-stream.ts

@@ -1,6 +1,5 @@
 import type { ConsoleLogger } from '@equinor/fusion-framework-cli/bin';
-import type { TemplateResource } from './template-resource-schema.js';
-import type { TemplateItem } from './template-item-schema.js';
+import type { TemplateResource, TemplateItem } from './template.schemas.js';
 import { copyFileSync, cpSync, existsSync } from 'node:fs';
 import { join } from 'node:path';
 

packages/cli/src/bin/helpers/ProjectTemplate.ts

@@ -1,5 +1,5 @@
 import { z } from 'zod';
-import { TemplatesManifestSchema, type TemplatesManifest } from './templates-manifest-schema.js';
+import { TemplatesManifestSchema, type TemplatesManifest } from './template.schemas.js';
 
 /**
  * Validates and parses a template manifest JSON string.