- UX: unknown-target message now reads "don't know any direction or place
called '...'" so direction typos (e.g. 'go nroth') make sense
- clarity: resolveVisited uses equalsIgnoreCase for id/name matching;
add null-world guard comment pointing to CommandTestSupport
- Javadoc: note that 'to' filler word is stripped, making go-to forms equivalent
- tests: assert 'through the Hallway' in 3-node route; update unknown message
assertion; add adjacentWalkUsesShortSummary covering the n==2 short-form path
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>