feat(document-mode): longer goal save countdown, per-directive folders, live task stream (#103)

Three connected UX changes for the document-mode directive UI.

## Goal save UX (DocumentEditor.tsx)
- Replace the old 3-second countdown with 60s when no orchestrator is running
  and 10s when one is, so editing a goal mid-flight does not feel rushed.
- The countdown bar is hidden until the last 10 seconds; users see "Saved" /
  "Unsaved changes" indicators rather than a constantly-ticking clock.
- Continuously persist work-in-progress to localStorage on every keystroke
  (debounced 250ms). On mount, if a draft for the directive exists in
  localStorage and differs from the persisted goal, restore it and put the
  editor in dirty/pending state — leaving the page no longer loses work.
- localStorage-backed "Live start" toggle in the bar. When off, the editor
  stays in "dirty" instead of auto-firing; user clicks "Save now" to commit.
- Discard button reverts the editor to the persisted goal and clears the draft.

## Sidebar restructure (document-directives.tsx)
- Drop the active/idle/archived top-level grouping; show one folder per
  directive instead. Folders sort by lifecycle (active, paused, idle, draft,
  archived) then alphabetically.
- Each folder header shows a colored status dot on BOTH sides (left as the
  primary status icon, right as a mirror plus a pulse when the orchestrator
  is live), replacing the previous "/active", "/idle" text labels.
- Inside each open folder: the directive's document is pinned at the top
  (with a small star icon), then the orchestrator task (if running), then
  the completion task, then any step tasks that have started.
- The currently-selected directive's folder is auto-opened so deep links
  always land somewhere visible.

## Live document task stream (DocumentTaskStream.tsx, new)
- Selecting a task in a folder navigates to ?task=<id> and replaces the
  Lexical editor with a document-styled live transcript: assistant prose as
  flowing paragraphs, tool calls as marginalia, results as a closing block.
  No log/code box.
- Comment textarea at the bottom calls sendTaskMessage on submit, the same
  wire the existing TaskOutput input bar uses for interrupts. ⌘/Ctrl-Enter
  submits.
- Header breadcrumb gains a "back to document" affordance to return to the
  pinned doc view without reopening the sidebar.

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

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