compliance: add unauthenticated /source route (AGPLv3 sec 13), bundle CHANGES.md

CHANGES.md

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+# Changes from upstream (DiD, LLC)
+
+This is a branding patch layer on top of docusealco/docuseal, maintained
+as a separate `did-branding` branch so it can be rebased against future
+upstream releases without editing upstream files directly. Base license
+is unchanged: AGPLv3, including the original DocuSeal attribution
+requirement in `LICENSE_ADDITIONAL_TERMS`.
+
+## did-branding branch
+
+- `tailwind.config.js`, `tailwind.dynamic.config.js`: replaced the default
+  daisyui theme's color palette with DiD's brand palette (Deep Navy
+  #022647, Lime Green #9BC73C, Light Blue #75B9FC, Soft Grey #CCD6D0),
+  and added a `heading` font family slot.
+- `app/views/layouts/_head_tags.html.erb`: added Google Fonts links for
+  Monda and Montserrat.
+- `app/javascript/application.scss`, `app/javascript/form.scss`: applied
+  the Monda/Montserrat heading font to h1-h6.
+- `app/views/shared/_logo.html.erb`: recolored the DocuSeal logo mark
+  from its default orange (#e97a42) to DiD's lime green (#9BC73C). The
+  logo shape and "DocuSeal" text attribution are unchanged, per
+  `LICENSE_ADDITIONAL_TERMS`.
+- `config/routes.rb`, `app/controllers/source_controller.rb`,
+  `app/views/source/index.html.erb`: added an unauthenticated `/source`
+  route publishing this instance's corresponding source (AGPLv3 §13),
+  this CHANGES.md, and the bundled LICENSE / LICENSE_ADDITIONAL_TERMS text.
+
+No application logic, data handling, or upstream file content was
+otherwise modified.