feat(surface-render): render single newlines as line breaks (breaks: true default)

[unforced]

Summary

Parachute renders markdown the way Obsidian/GitHub-comments do: a single \n inside a paragraph now renders as a visible line break, not collapsed to a space (strict CommonMark soft-break behavior). Enter=paragraph / Shift+Enter=newline only feels right if the newline actually shows. Markdown files stay clean — no trailing-two-spaces hacks needed.

• Wires remark-breaks into MarkdownView's remark pipeline, positioned before remarkWikilinks — it only ever sees plain paragraph text this way, and can't re-split the wikilink plugin's styled inert-unresolved <span> text node (which mdast-util-find-and-replace, the mechanism both plugins share, treats generically by node type).
• New breaks?: boolean prop on <MarkdownView>, default true. <NoteRenderer> forwards it straight through to the markdown branch (added to its Pick<MarkdownViewProps, …>).
• remark-breaks joins remark-gfm as a required peer dependency (imported unconditionally, same idiom).
• Fenced code blocks and inline code are unaffected — remark-breaks/mdast-util-find-and-replace only rewrites text mdast nodes, and code/inlineCode are distinct node types. Verified with a dedicated test.
• Version 0.2.0 → 0.3.0 (behavior-change default = minor bump) + CHANGELOG entry. 0.x caret semantics mean notes-ui (pinned ^0.2.0) does not auto-resolve to this — checked, it's not affected until it deliberately bumps.
• README: peer-dep install line + a new "Line breaks" section documenting the default/opt-out.

Where it landed

• packages/surface-render/src/markdown/MarkdownView.tsx — the breaks prop + remark pipeline wiring
• packages/surface-render/src/note/NoteRenderer.tsx — threads breaks through
• packages/surface-render/package.json — version bump + remark-breaks peer/dev dep
• packages/surface-render/CHANGELOG.md, README.md — docs
• packages/surface-render/src/__tests__/MarkdownView.test.tsx — 8 new tests

Test plan

All gates run locally in packages/surface-render, literal counts:

• bun run test — 69/69 passed (8 test files, including 8 new breaks tests: default <br>, paragraph-split preserved, breaks={false} strict-CommonMark collapse, trailing-two-spaces hard break, backslash hard break, fenced-code non-interference, inline-code non-interference, wikilink-adjacent text run)
• bun run typecheck — clean (tsc --noEmit && tsc -p tsconfig.test.json)
• bun run lint — clean (biome check ., 39 files)
• bun run build — clean (tsc, version.ts regenerated to 0.3.0)

Not merged, not tagged/published — reviewer to dispatch next.

🤖 Generated with Claude Code