Add release pipeline and upgrade toolchain to TypeScript 7

Publishing infrastructure
- Three Gitea workflows: ci.yml (PRs, non-main pushes), publish-snapshot.yml
  (main -> Gitea under dist-tag @main) and release.yml (tags -> Gitea + npmjs)
- Tag-driven releases as <package-dir>-v<version>; the manifest stays the
  source of truth and release.yml refuses to run if tag and manifest disagree
- Every publish is idempotent: each step checks the registry first, so a run
  that fails on the second registry can simply be re-run
- Hard coverage gate (85% branches) shared by CI, the pre-push hook and local
  runs, since the thresholds live in vitest.config.ts rather than a CI flag
- README.PUBLISH.md documents the whole mechanism

Toolchain
- TypeScript 7 native compiler; drop tsgo and ts-node, use tsx for dev runs
- Biome 1.9 -> 2.x, Vitest 1 -> 4, zod 3 -> 4, inquirer 8 -> 14, pnpm 11.17.0
- Replace inquirer-checkbox-plus-prompt, which is peer-capped at inquirer <9,
  with enquirer's AutoComplete; the CubeSelection contract is unchanged
- Stand in for zod 4's removed z.AnyZodObject with a local AnyObjectSchema

Repo hygiene
- Stop tracking dist/; ignore coverage/, *.tsbuildinfo, .npmrc* and release.json
- Drop package-lock.json in favour of pnpm-lock.yaml

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

biome.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
+  "$schema": "https://biomejs.dev/schemas/2.5.5/schema.json",
   "vcs": {
     "enabled": true,
     "clientKind": "git",
@@ -7,11 +7,9 @@
   },
   "files": {
     "ignoreUnknown": true,
-    "ignore": ["dist", "node_modules", ".yarn", "*.lock"]
-  },
-  "organizeImports": {
-    "enabled": true
+    "includes": ["**", "!**/dist", "!**/node_modules", "!**/.yarn", "!**/*.lock"]
   },
+  "assist": { "actions": { "source": { "organizeImports": "on" } } },
   "formatter": {
     "enabled": true,
     "indentStyle": "space",
@@ -21,7 +19,7 @@
   "linter": {
     "enabled": true,
     "rules": {
-      "recommended": true,
+      "preset": "recommended",
       "complexity": {
         "noForEach": "off"
       },
@@ -38,5 +36,17 @@
       "quoteStyle": "single",
       "trailingCommas": "es5"
     }
-  }
+  },
+  "overrides": [
+    {
+      "includes": ["**/tests/**"],
+      "linter": {
+        "rules": {
+          "performance": {
+            "noDelete": "off"
+          }
+        }
+      }
+    }
+  ]
 }