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.

tsconfig.json

@@ -24,7 +24,6 @@
     { "path": "./vendor/hmr" },
     { "path": "./vendor/logger-console" },
     { "path": "./packages/util/brand" },
-    { "path": "./packages/util/home" },
     { "path": "./packages/util/paths" },
     { "path": "./packages/util/timeout" },
     { "path": "./packages/util/retention" },