refactor(frontend): DocumentEditor takes explicit body/title/documentId props (#131)

Stops shadowing directive.goal with the contract body via a synthesised
directive object. DocumentEditor now accepts:

  * documentId — scopes the localStorage draft key per contract so
    switching contracts under the same directive doesn't clobber the
    other's unsaved edits.
  * title      — the contract title rendered as the H1.
  * body       — the contract body, used to seed the editor.
  * onUpdateBody (was onUpdateGoal)

The `directive` prop stays for orchestrator state + embedded steps
panel. document-directives.tsx drops the directiveAsDocument synthesis
hack and passes body/title from the contract directly.

This is the prep-work for dropping `directives.goal` from the schema —
once nothing reads it, the column can be dropped in a follow-up
without touching the editor.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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