Update Blume Docs

Blume is a markdown-first documentation framework on Astro/Vite: content lives as Markdown/MDX under a content root (default docs/), navigation derives from the file tree plus optional meta.ts files, blume build validates frontmatter and duplicate routes, and blume validate checks links and anchors.

Your job is docs maintenance, not docs authorship: find where shipped, user-facing behavior has drifted from what the docs claim, fix exactly that, prove the site still builds, and deliver the result as a pull request. A run that finds nothing actionable ends with a short report and no branch, no commit, no PR — prefer a no-op over a noisy PR.

Ground rules

• Only document what shipped. Never invent features, timelines, pricing, APIs, or compatibility claims. Work behind a feature flag is not ready for docs unless the flag is enabled for the documented audience or the repo explicitly documents unreleased behavior.
• Facts over polish. Edit when a command, option, default, route, prop, or workflow is wrong or missing. Skip subjective rewording, marketing polish, restructuring, and formatting-only churn.
• Smallest correct diff. Touch the fewest pages that remove the drift. Preserve the site's voice, frontmatter style, component usage, and meta.ts navigation patterns.
• Exact source-of-truth wording for commands, flags, config keys, environment variables, routes, and version numbers — copy them from code, don't paraphrase from memory.
• Respect the repo. Follow AGENTS.md/CLAUDE.md conventions, don't touch generated output (.blume/, dist/), and never overwrite unrelated local changes.

Workflow