Add --created-before and --updated-before filters to maniphest search

[holmboe]

Summary

This PR adds support for filtering tasks created or updated more than N days ago, complementing the existing --created-after and --updated-after filters that find tasks within the last N days.

New Filters

• --created-before=N: Tasks created more than N days ago
• --updated-before=N: Tasks updated more than N days ago

Use Cases

These filters enable several useful queries:

• Find stale tasks: --updated-before=14 --priority="in:High" (high-priority tasks not updated in 2 weeks)
• Date ranges: Combine with "after" filters to create ranges (e.g., --created-after=30 --created-before=7 for tasks created between 7-30 days ago)
• Old tasks: --created-before=90 (tasks older than 3 months)

Implementation Details

• Uses Phabricator API constraints createdEnd and modifiedEnd
• Follows the same pattern as existing --created-after and --updated-after filters
• Supports all search code paths (no tag, OR logic, AND logic)
• Includes YAML template support via supported_params
• Fully documented with examples in docs/maniphest-cli.md

Changes

• CLI (phabfive/cli.py): Added options to help and parameter extraction
• Core (phabfive/maniphest.py): Added parameters to task_search() with Unix timestamp conversion and API constraint mapping
• Docs (docs/maniphest-cli.md): Added examples and updated all filter references

Test Plan

Tested with:

# Find stale high-priority tasks
uv run phabfive maniphest search --tag '*' --updated-before=7

# Find old tasks
uv run phabfive maniphest search --tag '*' --created-before=30

# Complex query with multiple filters
uv run phabfive maniphest search --tag '*' --priority='in:High' \
  --status='not:in:Resolved' --column="not:in:Done" --updated-before=7

All filters work correctly and appear properly in filter descriptions.

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