experiment: add passive behaviour selection

Implement Experiment 19: deterministic behaviour selector with five
behaviours (Acknowledge, Clarify, Summarise, Continue, Pause).

- lib/behaviour-selection/behaviour-selector.js — Pure function selector
  applying v0.1 rules in priority order (acknowledge > clarify > summarise >
  pause > continue). Defaults to Continue with low confidence when no rule
  matches or assessment is incomplete. Guards against partial objects.

- tests/behaviour-selector.test.js — 51 tests covering all five behaviours,
  priority ordering, contract conformance, determinism, edge cases, and
  scenario-based validation with mock investigations.

- docs/design-evolution-log.md — Close Experiment 18 (record what assessor
  enabled for Behaviour Selection), add Experiment 19 section with hypothesis,
  scope, evaluation criteria, and open questions.

Passive integration only: no changes to reasoning engine, prompts, graph
generation, decomposition, narrative generation, API contracts, UI behaviour,
or Ollama integration.
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