fix(scripts): repoint package paths.mts re-exports to scripts/fleet/paths.mts

The scripts/{fleet,repo} segmentation renamed repo-root scripts/paths.mts to
scripts/fleet/paths.mts (git rename in the cascade commit). Three packages
(boringssl-builder, dawn-builder, node-smol-builder) inherit via
`export * from '../../../scripts/paths.mts'`, which now points at the deleted
path — breaking any test suite or script that imports build paths through them
(e.g. node-smol's smol-features-helper suite). Repoint all three re-exports to
'../../../scripts/fleet/paths.mts' (exports are identical; the move was a pure
rename).

With this + the vitest config repoint, node-smol-builder's 4 detection/compile/
gate/features unit suites pass (33 passed, 1 skipped).

Note: paths-mts-inherit-guard's findAncestorPathsMts() walks up for an ancestor
'scripts/paths.mts' and no longer finds the moved root, so it now treats these
package files as exempt (fail-open). That guard's ancestor-walk should learn the
scripts/fleet/ location — tracked separately for the cascade.

Author: jdalton

packages/boringssl-builder/scripts/paths.mts

@@ -2,7 +2,7 @@
  * Centralized path resolution for boringssl-builder.
  */
 
-export * from '../../../scripts/paths.mts'
+export * from '../../../scripts/fleet/paths.mts'
 
 import path from 'node:path'
 import process from 'node:process'

packages/dawn-builder/scripts/paths.mts

@@ -13,7 +13,7 @@
 // Inherit canonical roots (REPO_ROOT, CONFIG_DIR, NODE_MODULES_CACHE_DIR,
 // etc.) from the repo-root paths module per fleet rule
 // `paths-mts-inherit-guard`.
-export * from '../../../scripts/paths.mts'
+export * from '../../../scripts/fleet/paths.mts'
 
 import path from 'node:path'
 import { fileURLToPath } from 'node:url'

packages/node-smol-builder/scripts/paths.mts

@@ -10,7 +10,7 @@
  * Use getExistingPaths() to filter to only existing directories when needed.
  */
 
-export * from '../../../scripts/paths.mts'
+export * from '../../../scripts/fleet/paths.mts'
 
 import { existsSync } from 'node:fs'
 import path from 'node:path'