v1.18.0

Highlight: a keyword's casing is read the way OpenSpec reads it. spek marked one casing rule across every keyword it highlights, and the keywords do not carry the same obligation. A scenario body is free text that no version of OpenSpec parses, so uppercase WHEN / THEN is a template convention — a spec written with **Given** / **When** / **Then** is perfectly valid and rendered with no highlighting at all. SHALL / MUST is the opposite: OpenSpec matches it case-sensitively and reports a requirement carrying no uppercase one. The rule is now decided per keyword group, against what OpenSpec actually does with each.

• Title-case Gherkin steps are highlighted (#53). Given, When, Then and And are marked when the whole emphasised run is the keyword — **Given** a project is registered — which is how such specs are written. Uppercase is unchanged
• Ordinary prose is not marked. A requirement beginning "When the server receives a request, it SHALL respond" marks only SHALL, as before. Recognising a step by its position instead was measured across 300 specs from 242 repositories and rejected: it marks that sentence, which every repository has, to reach the 2% that write title case
• MUST / SHALL and the four delta operations stay uppercase-only. Red means normative here and lowercase "must" is an ordinary verb; **Modified**: heads an impact list in many proposals and names no delta operation there
• No keyword is highlighted inside a heading. An emphasised one used to be — ## **ADDED** Requirements showed a badge while the unemphasised form every spec actually uses did not
• A requirement or scenario heading drops its keyword whatever the casing. ### requirement: Foo displays as Foo, in the rendered content and in every table of contents, as ### Requirement: Foo already did. OpenSpec's own parser accepts the variant, so leaving the keyword visible showed formatting noise in place of the heading's name
• Internal: @spekjs/core 1.13.0 changes specHeadingLabel's behaviour on a heading whose keyword differs only in case