The routing-target check understood only a single-arrow clause naming a bare
skill, so most real boundary prose was silently skipped rather than verified.
Two of those silences were fail-open: an unrecognised token following a target
dropped that target from the check entirely, and a skill directory with no
SKILL.md still resolved as a valid routing target, so a broken route passed.
Multi-target arrow clauses now draw a SUGGESTION instead of being ignored,
hand-invocation phrasing is carved out so it is not read as a route, and a
dotted filename parses into a new `unparsed` status rather than disappearing.
Three test fixtures had been relying on the SKILL.md-less directory resolving
as a target; they are corrected alongside the check.
Addresses #107, #108, #110.
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