ci: fix build workflow — remove deprecated setup-xcode action, update to macos-15

feat(widget): Hook up Widget Extension target v2.3.0

fix(nova): correct NovaAPIServer compilation errors

docs: add Nova/Claude API integration section

chore(nova): add NovaAPIServer.swift to Xcode target

feat(nova): add NovaAPIServer local HTTP API

security: Redact Disney project references from public repo

security: Redact hardcoded home path from documentation

docs: Add issue template config (disable blank issues, security link)

fix: Change Dependabot to github-actions ecosystem (no SPM)

docs: Add community files (SECURITY.md, CONTRIBUTING.md, issue templates, Dependabot)

chore: Remove .DS_Store and xcuserdata from tracking

chore: Standardize .gitignore, remove tracked artifacts

docs(readme): Expand acronyms on first use

docs(readme): Add security hardening details for February 2026 audit