add Python stopgap planning tooling under tools/scripts/plan

Ports settled-reach's decisions_sync.py + ticket + decision scripts,
Scrum-stripped. Writes to .pql/pql.db (gitignored). Verb shape
mirrors the eventual `pql` subcommands so migration is a call-site
find-replace once pql ships feature parity (D-040, R-011).

Ticket IDs are T-NNN (TEXT PKs) — reshape from settled-reach's
integer auto-increment so the stopgap's writes are compatible with
pql's future reads without a data migration. No `sprints` table; the
pyramid is kanban / waterfall (D-035).

Verified end-to-end: sync parses 71 records (39 confirmed, 23 open
questions, 9 rejected) with 62 cross-refs and zero broken links;
`ticket new`, `ticket status`, `ticket board`, and `decisions show
--with-refs` all round-trip correctly.

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -48,9 +48,14 @@ coverage.*
 /tmp/
 
 # -- pql per-repo state (clide dogfoods against itself; pql's index lands
-#    here when running queries locally). Mirror what `pql init` writes.
+#    here when running queries locally). `pql.db` is also where the
+#    `tools/scripts/plan` stopgap writes decisions + tickets (D-040).
 /.pql/
 
+# -- Python stopgap tooling under tools/scripts/plan ------------------
+tools/scripts/__pycache__/
+tools/scripts/planning/__pycache__/
+
 # -- SQLite index files (defensive; should never land at repo root) ----
 *.sqlite
 *.sqlite-journal