fix(ruby): fix Rubocop Naming/VariableNumber and Lint/Void offenses in generated SDKs

[fern-support]

Description

Fixes 9 Rubocop offenses (6 × Naming/VariableNumber, 3 × Lint/Void) that cause CI failures in generated Ruby SDKs such as Schematic's.

Changes Made

Fix 1: Naming/VariableNumber (6 offenses)

The generator's snake_case conversion (via lodash) inserts underscores before trailing digits — e.g. account_last4 → :account_last_4. The generator's own .rubocop.yml enforces normalcase, which disallows this.

• Added rubyPropertyName() helper in AbstractRubyGeneratorContext.ts that uses the existing rubySnakeCase() function (which does not treat letter→digit as a word boundary) and preserves any reserved-word suffix the IR adds
• Exported rubySnakeCase so SDK-layer code can use it for non-property names (e.g. auth parameter names)
• Replaced all snakeCase.safeName / snakeCase.unsafeName usages for property/field names across 8 generator files:
  • generateFields.ts, UnionGenerator.ts, HttpEndpointGenerator.ts, WrappedEndpointRequest.ts, FileUploadEndpointRequest.ts, RootClientGenerator.ts, SubPackageClientGenerator.ts

Fix 2: Lint/Void (3 offenses)

Static runtime template files had bare value expressions in void context (other branches used explicit return, so the case return value was discarded).

• boolean.Template.rb:20 — value → return value
• utils.Template.rb:84,87 — value → return value (two locations)

Fix 3: Hyphen handling in rubySnakeCase

The custom rubySnakeCase function originally only handled camelCase→snake_case transitions but did not convert hyphens to underscores. This caused invalid Ruby identifiers when IR original names contained hyphens (e.g. favorite-number → favorite-number instead of favorite_number, nested-no-auth → def nested-no-auth which is a syntax error).

• Added .replace(/[-\s]+/g, "_") as the first step in rubySnakeCase to normalize hyphens and spaces to underscores before case conversion

Seed snapshots

• Updated all ruby-sdk-v2 seed snapshots (113/114 pass; the one failure exhaustive:extra-deps is a pre-existing expected failure)

• Updated versions.yml with v1.1.6 changelog entry

• Updated README.md generator (if applicable) — N/A

Testing

• pnpm run check passes clean (lint + typecheck)
• All ruby-sdk-v2 seed tests pass locally (113/114, 1 expected failure)
• Manual testing with schematic-fern-config (requires FERN_TOKEN — can be verified post-merge by running fern generate --group ruby-sdk --preview then bundle exec rubocop)

Human Review Checklist

• Verify rubySnakeCase handles all separators that could appear in IR originalName values. Currently handles hyphens, spaces, camelCase, and ALLCAPS boundaries — but are there other separators (dots, slashes, etc.) that the IR's built-in snakeCase handles that this regex doesn't?
• Verify rubyPropertyName correctly handles reserved-word suffixes — the function assumes IR appends a suffix to unsafeName to produce safeName and that safeName.startsWith(unsafeName). Check edge cases where this assumption could break.
• Confirm seed snapshot diffs are correct — note that diffs also include changes merged from main (v1.1.4 Basic Auth, v1.1.5 security headers) which are unrelated to this PR's generator changes.
• Spot-check generated output for names with consecutive digits or mixed separators (e.g. x-api-v2-key → should become x_api_v2_key).

Link to Devin session: https://app.devin.ai/sessions/229bc98388514f0c85d801e4d53cefa8

[claude]

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[github-actions]

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[devin-ai-integration]

The seed-test-results (ruby-sdk-v2) failure was due to 1 runner being cancelled (infrastructure issue, not a code failure). All 11 other ruby-sdk-v2 jobs passed. Could someone re-run the cancelled job (ruby-sdk-v2 (audiences, circular-references-advanced, enum, file-upload, imdb, multi-url-environm...)) to get CI green?