Revert "docs: add Phase-2 frontend cite/export planning docs (#34)"

[dknauss]

Reverts #34.

PR #34 salvaged Phase-2 frontend cite/export planning docs from the stale claude/clever-colden-617e8b branch. That was a mistake: main already contains the canonical version of this work as Phase 04 (.planning/phases/04-frontend-cite-export-affordances/, committed 68e1d90 on 2026-05-10), which is more complete (CONTEXT + 4 plans) and uses a deliberately different, superior architecture.

• 04- (canonical): zero-JS — native <details> disclosure panels with export strings pre-computed in the editor, preserving the plugin's static-save / no-frontend-JS contract.
• 02- (reverted): view.js runtime hydration via a data-csl attribute — requires frontend JS, contradicting that contract. An earlier, abandoned direction.

The 02- number also collided with main's archived Phase 02 (performance/stability remediation). Removing the stale docs + 2 associated todos to avoid confusion. Implementation will proceed from the canonical 04- plans.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.47%. Comparing base (ef4ccd7) to head (7f595bb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #36   +/-   ##
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  Coverage   81.47%   81.47%           
=======================================
  Files          40       40           
  Lines        2613     2613           
  Branches      464      464           
=======================================
  Hits         2129     2129           
  Misses        126      126           
  Partials      358      358           

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