feat(rendering)!: Rewrite ssg pipeline

[lemyskaman]

BREAKING CHANGE: replaces empty-shell SSG with fully-rendered HTML pipeline. All public routes now emit compiled Markdown + React component HTML at build time instead of empty

shells.

Changes:

• New src/ssg/ module: RenderStrategy (interface), DefaultRenderStrategy, RenderPipeline, RenderContext, RenderHooks, SsgOptions, TemplateOverrides
• RenderStrategy interface allows full pipeline replacement (DefaultRenderStrategy renders React via renderToString with compiled Markdown props)
• Hook pipeline with five phases: beforeRender, transformMarkdown, transformHtml, afterRender, onError — all typed, ordered, async, with error recovery
• Template system with built-in index.html.ejs + filesystem override convention (flatwave-templates/ at project root)
• Markdown compiler (unified/remark/rehype) extracted to src/content/markdownCompiler.ts with compileMarkdownToHtml(markdown, options?) for reuse
• Plugin option ssg: { enabled, strategy?, hooks?, template?, compileMarkdown? } with sensible defaults
• Example app demonstrates transformMarkdown + transformHtml hooks
• Output HTML now contains: compiled Markdown inside
  , SEO tags, analytics beacon injected via transformHtml hook
• Removed dead code: empty src/ssg/ dir, inline renderRouteHtml/renderSitemap/ renderRobotsTxt from index.ts, unused ContentMarkdownCompilerOptions alias, unused RenderStrategy.ts file
• Fixed production bugs: nested
  in error fallbacks, double markdown compilation, transformHtml running on component output instead of final document, component-not-found swallowing all content (now graceful fallback to compiled markdown)
• Version bumped to 1.0.0 (was 0.1.0)
• All 82 OpenSpec tasks complete; npm run validate passes (format, lint, type-check, build, 11 tests)

[github-actions]

🎉 This PR is included in version 2.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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