feat: Add generated YARD docs and deprecation metadata to Ruby SDK codegen

[razor-x]

Motivation

• Improve the generated Ruby SDK by emitting YARD-style documentation, parameter/return descriptions, and deprecation notes for resources and client methods so the SDK is more discoverable and self-documenting.
• Surface resource- and endpoint-level descriptions from the blueprint into the templates so generated code includes meaningful comments and per-attribute docs.

Description

• Added Handlebars helpers in codegen/lib/handlebars-helpers.ts (rubyDoc, rubyParamDoc, rubyReturnDoc, rubyDeprecatedDoc) to format Ruby comments and deprecation lines.
• Updated Handlebars layouts (codegen/layouts/partials/client-method.hbs, codegen/layouts/resource.hbs) to emit documentation blocks, parameter docs, return docs, and deprecation notices where applicable.
• Extended layout/context builders to carry documentation metadata: codegen/lib/layouts/client.ts, codegen/lib/layouts/resource.ts, codegen/lib/routes.ts, and codegen/lib/ruby-client.ts now include description, isDeprecated, deprecationMessage, parameter descriptions, and responseDescription fields.
• Plumbed resource documentation through getResources so templates receive resource-level descriptions and property-level metadata.
• Regenerated Ruby SDK files (many lib/seam/resources/*.rb and lib/seam/routes/*.rb) to include per-attribute comments, split date_accessor entries into individual lines with comments, YARD @param/@return comments on client methods, and @deprecated annotations where relevant.

Testing

• No automated tests were executed as part of this change.

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Codex Task