✨ Add pubv-based release.sh and npm run release

Release front-door: pubv runs preflight + the interactive semver
heuristic and graduates CHANGELOG.md [Unreleased] -> dated; npm version
syncs package.json + lockfile; git commit --amend folds them into
pubv's single release commit; the tag is created AFTER the amend so it
marks the exact commit on main that gets published; then push. Tags are
v-less (--tag-prefix=none) to match the changelog compare refs.

@runwisp/pubv added as a devDependency. The short "how we got here /
what was rejected" note lives as a comment atop the script; the docs/
exploration was removed as too much to read.

cspell.json

@@ -19,7 +19,16 @@
         "arethetypeswrong",
         "knip",
         "tsgolint",
-        "gitea"
+        "gitea",
+        "pubv",
+        "knope",
+        "runwisp",
+        "glab",
+        "postversion",
+        "Zilla",
+        "kacl",
+        "bestikk",
+        "silverwind"
     ],
     "ignorePaths": ["dist", "node_modules", "coverage", "*.svg", ".gitignore"]
 }