feat: enable semantic CSS by default

docs/changelog/index.mdx

@@ -17,7 +17,7 @@ rss: true
 - Added the Semantic CSS editor under **Design → Custom Styles**, with live status, error line and column numbers, "selector matches nothing" warnings, stylesheet undo and redo, **Reset to applied stylesheet**, **Copy stylesheet**, and a focus mode that opens full-width on mobile. [d2ffbf961](https://github.com/amruthpillai/reactive-resume/commit/d2ffbf961)
 - Resumes still using the previous Custom Styles form get a converted stylesheet draft to review; the original legacy rules stay active until you select **Activate Semantic CSS**, and remain available for rollback. [d2ffbf961](https://github.com/amruthpillai/reactive-resume/commit/d2ffbf961)
 - Added semantic selectors, attributes, and template-specific parts for all 15 templates, plus pagination and page-size controls (`break-inside`, `orphans`, `widows`, `-resume-min-presence-ahead`, `size`) and PDF-dimension media queries. [d2ffbf961](https://github.com/amruthpillai/reactive-resume/commit/d2ffbf961)
-- Self-hosters control the rollout with the new `FLAG_SEMANTIC_CSS_AUTHORING` and `FLAG_SEMANTIC_CSS_DEFAULT` environment variables. [d2ffbf961](https://github.com/amruthpillai/reactive-resume/commit/d2ffbf961)
+- New resumes start in Semantic CSS mode automatically, while existing legacy styles remain active until their converted draft is explicitly activated.
 - Invalid style intents are now filtered out instead of discarding the whole rule set, so one bad entry no longer drops your valid custom styles. [689e7e24d](https://github.com/amruthpillai/reactive-resume/commit/689e7e24d)
 - Custom style numeric inputs are clamped to their supported ranges. [2a0782517](https://github.com/amruthpillai/reactive-resume/commit/2a0782517)
 - Award titles can now be un-bolded through custom styles. [08d859010](https://github.com/amruthpillai/reactive-resume/commit/08d859010)

docs/spec.json

@@ -9969,23 +9969,13 @@
 										"smtpEnabled": {
 											"type": "boolean",
 											"description": "Whether outbound email (SMTP) is configured on this instance."
-										},
-										"semanticCssAuthoring": {
-											"type": "boolean",
-											"description": "Whether Semantic CSS authoring is enabled on this instance."
-										},
-										"semanticCssDefault": {
-											"type": "boolean",
-											"description": "Whether new resumes start in Semantic CSS mode."
 										}
 									},
 									"required": [
 										"disableSignups",
 										"disableEmailAuth",
 										"showSponsors",
-										"smtpEnabled",
-										"semanticCssAuthoring",
-										"semanticCssDefault"
+										"smtpEnabled"
 									]
 								}
 							}