chore: remove em dashes and canned AI-style prose

Summary

Audit documentation and code comments for em dashes and canned machine-generated writing patterns. Rewrite the affected prose so it is direct, natural, technically precise, and consistent with the project voice.

Scope

• Review all documentation files, comments, and docstrings across source code, tests, configuration, examples, and root-level project files.
• Remove em dash characters. Also replace en dashes when they are being used as sentence punctuation rather than as a legitimate range marker.
• Rewrite canned or inflated phrasing, including repetitive summaries, unnecessary restatement, fake quotations, excessive sectioning, generic marketing language, and meta commentary that does not help the reader.
• Prefer short declarative sentences and concrete technical wording.
• Preserve technical meaning, commands, code samples, identifiers, citations, changelog facts, and intentional quoted material.
• Keep this focused on documentation prose, comments, and docstrings. Do not casually rewrite runtime behavior or unrelated user-facing copy.

Acceptance criteria

• No em dash characters remain in documentation, comments, or docstrings.
• En dashes used as sentence punctuation are removed; legitimate range notation is preserved where appropriate.
• Documentation and comments no longer contain obvious canned machine-generated filler or redundant prose.
• Rewrites preserve technical accuracy and do not introduce behavioral changes.
• A reproducible scan documents how prohibited dash characters were checked.
• Documentation checks, tests, and required linters pass.

Start by inventorying documentation files, source and test comments, configuration, examples, and root-level project files, then run a reproducible scan for em and en dash characters. Review matching prose for the listed canned-writing patterns while preserving technical content, ranges, quotations, commands, and identifiers. Done means the documented scan is clean where required and documentation checks, tests, and linters pass without behavioral changes.