Reorganize packages into a modular hierarchy

Move the 18 flat packages/<name> packages into role-grouped dirs:
core/, llm/, bash/, session-persistence/, ui/, support/. Group dirs are
pure containers; each package keeps its @deepseek-ai/dsh-* name.

Collapse the per-package tsconfig paths maps (base + typecheck) into one
@deepseek-ai/dsh-* wildcard with a candidate per group, and derive the
publint list from the hierarchy. Update all depth-coupled globs/configs
(workspace, tsdown, vitest, eslint, knip, tsconfig includes/refs,
per-package tsconfigs, generators, doc-script scopes, type-equiv manifest)
and the cross-package/script relative imports in tests.

Fix doc-typecheck's workspacePaths() to parse tsconfig JSONC via the
TypeScript API instead of a regex comment-strip, which corrupted the
new wildcard `/*/` path candidates.

WIP: doc cross-links and package/RFC docs still to update.

eslint.config.mjs

@@ -30,7 +30,7 @@ export default tseslint.config(
 
   // --- our packages: full strictness -------------------------------------
   {
-    files: ['packages/*/src/**/*.ts', 'examples/**/*.ts', 'scripts/**/*.ts'],
+    files: ['packages/*/*/src/**/*.ts', 'examples/**/*.ts', 'scripts/**/*.ts'],
     extends: [
       ...tseslint.configs.strictTypeChecked,
     ],
@@ -81,7 +81,7 @@ export default tseslint.config(
 
   // --- tests: same rules, minus the friction that fights test ergonomics --
   {
-    files: ['packages/*/tests/**/*.ts'],
+    files: ['packages/*/*/tests/**/*.ts'],
     extends: [
       ...tseslint.configs.strictTypeChecked,
     ],