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>

tools/scripts/planning/__init__.py

@@ -0,0 +1,5 @@
+"""Planning stopgap — decisions + tickets written to .pql/pql.db.
+
+Time-limited per D-040; replaced by pql subcommands when feature parity
+lands. See ../README.md for the sunset clause.
+"""