Adds a new command and CLI subcommand that converts a GSD-2 `.gsd/`
project back to GSD v1 `.planning/` format — the reverse of the forward
migration GSD-2 ships.
Closes#2069
Maps GSD-2's Milestone → Slice → Task hierarchy to v1's flat
Milestone sections → Phase → Plan structure. Slices are numbered
sequentially across all milestones; tasks become numbered plans within
their phase. Completion state, research files, and summaries are
preserved.
New files:
- `get-shit-done/bin/lib/gsd2-import.cjs` — parser, transformer, writer
- `commands/gsd/from-gsd2.md` — slash command definition
- `tests/gsd2-import.test.cjs` — 41 tests, 99.21% statement coverage
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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