Add --assigned filter to maniphest search with OR logic support

[holmboe]

Summary

Implements support for filtering Maniphest tasks by assignee using the --assigned parameter. Users can now filter tasks assigned to themselves using @me or specify other users by username. Supports OR logic with comma-separated values for filtering by multiple assignees.

Features

• Single assignee filtering:

  • --assigned @me - Filter tasks assigned to current authenticated user
  • --assigned username - Filter tasks assigned to specific user

• Multiple assignees with OR logic:

  • --assigned @me,user1,user2 - Filter tasks assigned to ANY of the specified users
  • Comma-separated syntax for OR logic (similar to --tag filter)

• Works with all other filters:

  • Compatible with --tag, --status, --priority, date filters, etc.
  • Example: --assigned @me,user1 --tag dynatron --status 'not:in:Resolved'

Implementation Details

• Uses Phabricator API's user.whoami() to resolve @me to current user's PHID
• Resolves usernames to PHIDs using existing _resolve_user_phid() method
• Passes PHID list to maniphest.search API's assigned constraint
• API natively supports OR logic for multiple PHIDs in assigned filter
• Applied to all three query paths in task_search() method

Examples

# Tasks assigned to me
phabfive maniphest search --assigned @me

# Tasks assigned to me within a specific project
phabfive maniphest search --assigned @me --tag MyProject

# Tasks assigned to me OR user1 that are not resolved
phabfive maniphest search --assigned @me,user1 --tag dynatron --status 'not:in:Resolved'

# Multiple users
phabfive maniphest search --assigned user1,user2,user3

Testing

• Help output verified with updated documentation
• Implementation ready for testing against Phabricator/Phorge instances

Related

Closes any related issues (if applicable)

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