chore: swap pyproject author email to GitHub noreply, 0.2.19 (#111)

Pre-publish hygiene per #98: pyproject.toml carried the maintainer's
personal Gmail in the [authors] block, which becomes world-readable
the moment the repo is flipped public (and gets scraped by PyPI-style
metadata indexers regardless).

Swaps to the GitHub privacy-protected noreply alias
(41453723+constk@users.noreply.github.com) that already serves as
the git-author identity across develop/main history. Same contact
identity, less personal-data leak.

Closes #98. Also closes #97 — the artifact-tracking audit ran clean
on the current checkout (no .coverage, .venv, __pycache__, .pyc, or
node_modules tracked).

Self-version bump 0.2.18 -> 0.2.19 (chore = PATCH).

Author: constk

pyproject.toml

@@ -1,13 +1,13 @@
 [project]
 name = "harness-python-react"
-version = "0.2.18"
+version = "0.2.19"
 description = "Production-quality LLM-driven coding harness — Python (FastAPI) backend, Vite + React + TypeScript frontend."
 readme = "README.md"
 requires-python = ">=3.14"
 license = "MIT"
 license-files = ["LICENSE"]
 authors = [
-    { name = "Constantinos Koutsakis", email = "constantinos.koutsakis@gmail.com" },
+    { name = "Constantinos Koutsakis", email = "41453723+constk@users.noreply.github.com" },
 ]
 keywords = [
     "template",