What
The Phase 1 and Phase 2 plan-mode prompt text moved out of the inline prompt builder with no wording change.
Details
- both the parallel-subagent and the direct-exploration variants now come from a single helper returning
phase1andphase2 - the strings are byte-identical and there is exactly one caller, so behaviour is unchanged
Evidence
### Phase 1: Initial Understanding
Strings lifted out of the shipped bundle, so the claim above can be checked against them.