refactor(paths): collapse harness home resolution into one resolver

Delete @deepseek-ai/dsh-home and make dsh-paths the sole owner of the
single-root harness home ($DSH_HOME || ~/.dsh). Migrate tool-bash,
skill-local, and agent-spine-demo off dsh-home, and fold telemetry's
divergent globalConfigDir onto the shared resolver, dropping its second
XDG/APPDATA policy and the deepseek-harness namespace so the anonymous
id lives under the harness home. Add dshHomeDisplay() for symbolic
user-facing paths, replacing workspace-context's bespoke check.

packages/skill/skill-local/src/index.ts

@@ -17,7 +17,7 @@ import z from 'schemastery'
 import type Schema from 'schemastery'
 import { parse as parseYaml } from 'yaml'
 import type { FileSystem, FsDirEntry, FsTarget } from '@deepseek-ai/dsh-fs'
-import { resolveDshHome } from '@deepseek-ai/dsh-home'
+import { resolveDshHome } from '@deepseek-ai/dsh-paths'
 import {
   isSkillName,
   type SkillCandidate,