Compress the speculative 452-line architecture spec into a constraint-focused
experiment brief. Reduce the initial behaviour set to five patterns
(Acknowledge, Clarify, Summarise, Continue, Pause) — the smallest useful
subset for testing whether behaviour selection improves over 'always ask'.
Remove: arbitrary weights/scores, convergence requirements, phase-constrained
tables (design preferences not discoveries), rationale output infrastructure,
Behaviour Readiness dimension specs.
Keep: five behaviours with plain condition-matching rules, explicit v0.1 scope
boundary, Future Considerations section for deferred architecture items.
Also add Behaviour Selection entry to reasoning-contract-backlog and mark
Stage 4 (State Assessment) as implemented in investigation-turn-cycle.
