chore(gitignore): quarantine agent runtime scratch and per-worktree memory buckets

autoresearch/ runs, agent/predict/ ngram models, local/ artifact dumps, wt/
worktrees and memories/--home-blank-.omp-wt-* buckets are runtime state keyed
on ephemeral paths; none were tracked, so the rules are purely additive.

.gitignore

@@ -59,3 +59,14 @@ puppeteer/
 
 # harness runtime transcripts: local-only, may contain raw session secrets
 agent/sessions/
+
+# --- agent runtime scratch: research runs, decode predictions, worktrees ----
+autoresearch/
+agent/predict/
+local/
+wt/
+
+# --- per-worktree memory buckets: keyed on ephemeral worktree paths ---------
+# A session run inside a git worktree mints a bucket named after the worktree
+# path; the worktree is deleted, the bucket is orphan state, not config.
+agent/memories/--home-blank-.omp-wt-*