fix(FN-2897): harden npm bundle packaging and merge recovery flows

- Strip private @fusion/* workspace devDependencies from the published CLI manifest via prepare-publish-manifest and package metadata updates
- Replace cross-spawn usage and add staged bundle layout assertions to verify resolver output in dist packaging
- Add per-task/project model override resolution across core, dashboard settings/task modals, and route coverage with new regression tests
- Strengthen engine merge/recovery handling for paused/interrupted/squash paths and surface merger timeline activity with additional self-healing and merger tests
- Add changesets for npm bundle dependency fixes, project model override stabilization, and FTS5 corruption recovery

Fusion-Task-Id: FN-2897

packages/cli/src/commands/claude-cli-extension.ts

@@ -49,13 +49,15 @@ export type ClaudeCliExtensionResolution =
  * module's location, and fall back to `require.resolve` for monorepo
  * dev/test runs where this file executes from `src/` rather than `dist/`.
  */
-export function resolveClaudeCliExtension(): ClaudeCliExtensionResolution {
+export function resolveClaudeCliExtensionFromModuleUrl(
+  moduleUrl: string,
+): ClaudeCliExtensionResolution {
   let pkgJsonPath: string | undefined;
 
   // Bundled lookup: when running from dist/, sibling dir dist/pi-claude-cli/
   // holds the staged extension. Walk up a few levels to also catch nested
   // layouts (e.g. dist/commands/foo.js) without hard-coding depth.
-  const here = dirname(fileURLToPath(import.meta.url));
+  const here = dirname(fileURLToPath(moduleUrl));
   for (const rel of ["pi-claude-cli", "../pi-claude-cli", "../../pi-claude-cli"]) {
     const candidate = resolve(here, rel, "package.json");
     if (existsSync(candidate)) {
@@ -113,6 +115,10 @@ export function resolveClaudeCliExtension(): ClaudeCliExtensionResolution {
   };
 }
 
+export function resolveClaudeCliExtension(): ClaudeCliExtensionResolution {
+  return resolveClaudeCliExtensionFromModuleUrl(import.meta.url);
+}
+
 /**
  * Compute the paths to append to `discoverAndLoadExtensions`' configuredPaths
  * based on the user's `useClaudeCli` setting.