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fix(extensions): drop shiki from the extensions barrel (#369)

Shiki's implementation statically imports shiki/core from plain JS, so
re-exporting it from the /extensions barrel (shipped in v1.8.0, #361)
forced every barrel consumer's bundler to resolve the optional shiki
peer dependency — hard-breaking consumers without shiki installed even
when they never use highlighting. This restores the shiki spike's
documented invariant: shiki ships only via the dedicated
extensions/shiki subpath.

Guards so it cannot silently regress again:
- barrel-optional-deps.test.ts walks the barrel's transitive plain-TS
  module graph and fails on any shiki import
- tree-shaking.mjs gains an 'extensions barrel stays shiki-free' case

Docs demos, the syntax-highlighting page, and the README example now
import from @humanspeak/svelte-markdown/extensions/shiki.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

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