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.

knip.json

@@ -50,11 +50,6 @@
       "project": ["src/**/*.ts"],
       "ignoreDependencies": ["cordis"]
     },
-    "packages/util/home": {
-      "entry": ["tests/**/*.spec.ts"],
-      "project": ["src/**/*.ts", "tests/**/*.ts"],
-      "ignoreDependencies": ["cordis"]
-    },
     "packages/util/timeout": {
       "entry": ["tests/**/*.spec.ts"],
       "project": ["src/**/*.ts", "tests/**/*.ts"],