chore(gitignore): ignore dev-host noise (.311 venv, wiki clone, scratch logs)

- .311/ and .3[0-9][0-9]/ + .venv*/ — cpython-version-suffixed venvs
  (common convention) now covered alongside the existing .venv/.
- wiki-checkout/ — local nested clone of the wiki; never a submodule.
- hang.log / schem / *.pytest.log — scratch dumps from saved pytest
  output redirections.
- deps.txt — pydeps-style dependency graph from local analysis runs.

No tracked files affected; just stops new working-tree noise from
showing up in git status.

.gitignore

@@ -1,4 +1,7 @@
 .venv/
+.venv*/
+.311/
+.3[0-9][0-9]/
 logs/
 .claude/*
 CLAUDE.md
@@ -28,3 +31,16 @@ decnet.json
 .hypothesis/
 profiles/*
 tests/test_decnet.db*
+
+# Nested git clone of the wiki — not a submodule, just a local
+# working copy so we can edit docs without a full round-trip.
+wiki-checkout/
+
+# Scratch test/debug outputs that leak from saved `pytest > hang.log`
+# or `pytest > schem` redirections.
+hang.log
+schem
+*.pytest.log
+
+# pydeps-style dependency graph dumps from local analysis runs.
+deps.txt