feat: add directory prompt on run and cloud mode gating

[lucasheriques]

Summary

Implements the frictionless directory selection flow: when clicking "Run" without a directory set, Array prompts the user to either select an existing directory or clone the repository.

User Flow

For tasks WITH repository_config:

When user clicks "Run (Local)" without a directory:

1. Prompt: "Do you have org/repo locally?"
2. Options:
   • "I have it locally" → Opens native folder picker → Saves mapping → Runs task
   • "Clone for me" → Triggers clone with progress UI → Saves mapping → User clicks Run again after clone
   • "Cancel" → Returns to task detail

For tasks WITHOUT repository_config:

When user clicks "Run (Local)" without a directory:

1. Prompt: "Select a working directory for this task"
2. Opens folder picker → Saves mapping → Runs task

Invalid Directory Handling:

• If user selects an invalid directory → Validation fails silently → Prompt appears again
• No error spam, seamless recovery
• User can clear directory with X button and retry

Working Directory Field:

• Shows actual directory that will be used (not derived fallback)
• Empty with "Not set - click Run to select" when no directory
• Clear button (X) appears only when directory is set

Cloud Mode Gating:

• Cloud mode toggle is disabled for tasks without repository_config
• Tooltip explains: "Cloud mode requires a connected repository"

Benefits

1. Frictionless onboarding: No upfront workspace configuration required
2. Supports existing workflows: Engineers can point to repos they already have cloned
3. On-demand cloning: Clone only when needed, with visual progress
4. Flexible: Supports both git-based and directory-only tasks
5. Persistent: Directory mappings survive app restarts
6. Graceful recovery: Invalid paths automatically re-prompt instead of erroring
7. Clear UI: Always shows what will actually be used

Test Plan

• Task with repo, no directory set → Prompt appears with 3 buttons
• "I have it locally" → Folder picker opens → Selection persists
• "Clone for me" → Clone progress shows → Directory saved after clone
• Task without repo → Prompt shows "Select directory" with 2 buttons
• Cloud mode disabled when no repository_config → Tooltip shows
• Select invalid directory → Auto-prompts again (no error spam)
• Clear directory with X button → Working directory shows empty → Run shows prompt
• Working directory field shows actual path only

---

Stack: Built on top of:

• PR feat: Display real-time clone progress in UI #128: Clone progress UI
• PR chore: Add task directory mapping store #130: Task directory store foundation
• PR feat: integrate task directory store into execution flow #131: Integrate directory store into execution flow

[lucasheriques]

• feat: add directory prompt on run and cloud mode gating #132 👈 (View in Graphite)
• feat: integrate task directory store into execution flow #131
• chore: Add task directory mapping store #130
• feat: Display real-time clone progress in UI #128
• main

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[jonathanlab]

Nice, 🚢.

We definitely need to clean up this giant runTask action at one point, it's responsible for too much stuff and getting hard to read.

[lucasheriques]

Merge activity

• Nov 18, 11:39 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Nov 18, 11:44 AM UTC: Graphite rebased this pull request as part of a merge.
• Nov 18, 11:45 AM UTC: @lucasheriques merged this pull request with Graphite.