fix(web): retire the stale homelab-era copy — neutral, accurate defaults on every page

Fixed: index.html meta description, empty-state sub and composer
placeholder (A1); app/config.py default suggestion chips → the four
neutral A2 defaults (BOR_SUGGESTIONS override unchanged); sources.html
KB page-sub → the current source model (git repos + local dirs +
uploaded archives, Sync pulls/imports); git-sources.html example URL
→ your-repo.git (A3); all 9 footers → neutral default in
span.footer-text (the phase-62 hook); E2E/unit conftests force the
code defaults so a local .env cannot leak corpus copy into tests;
new unit text pins + dedicated E2E suite.

Task 02 verification read-through — no change needed:
- sources.html sync result/error copy (matches the real sync behavior)
- tuning.html page-sub (accurate as written)
- history.html page-sub (accurate as written)
- doc-edit.html page-sub (accurate as written)
- git-sources.html page-sub (accurate as written)
- #sources-gate anonymous copy (accurate as written)

tests/e2e/test_response_to_docs.py

@@ -216,6 +216,11 @@ def _spawn_app(port: int, mock_port: int, docs_env: dict[str, str] | None) -> su
             "BOR_DOCS_WORK_DIR",
         ):
             env.pop(var, None)
+        # Phase 61 (defect fix): the pop only clears the process env —
+        # pydantic-settings would still pick up ``BOR_DOCS_REPO`` from an
+        # operator's local (gitignored) ``.env`` (``cwd=REPO``). Force
+        # empty so the "unconfigured" boot really is the inert default.
+        env["BOR_DOCS_REPO"] = ""
     else:
         env.update(docs_env)
     return subprocess.Popen(