DX-053: Add prose linting with the SO4 style rules

[IbrahimIjai]

Context

A hundred pages written by different people drift in voice unless the style
guide is executable. The rules are already written down in
docs/dx_1/003_content_map.md §5 — this makes them checkable.

Scope

• Add a prose linter with a committed SO4 style configuration.
• Encode the rules from the content map: no "simply", "just", "obviously",
  "easy"; no exclamation marks; consistent product and protocol capitalisation;
  prefer active voice; flag sentences over a length threshold.
• A project term list for correct spelling of Soroban, Stellar, Freighter,
  Turborepo, and our own feature names.
• Errors for correctness rules (terminology, capitalisation), warnings for style
  rules, so voice suggestions never block a merge on their own.
• Wire into CI over apps/docs/content and the repository's markdown files.

Acceptance criteria

• Every rule from the content map §5 is encoded or explicitly deferred with
  a reason.
• Existing repository markdown passes, or violations are fixed in the PR.
• Errors fail CI; warnings are reported but do not.
• The configuration is documented for authors.

Out of scope

• Rewriting existing prose beyond fixing flagged violations.

---

Spec: docs/dx_1/003_content_map.md §5 · Depends on: DX-052

[ritchiejhay]

@ritchiejhay has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello, I’ve read through the issue description and understand the expected outcome. I’d be glad to work on it.

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[Joyee730]

@Joyee730 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello maintainer, kindly assign me please

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