Update project header from FMPose to FMPose3D with Apache 2.0 license

[Copilot]

Rebrand header docstrings to reflect project name change and licensing clarification.

Changes

• Updated fmpose/__init__.py header:

  • FMPose: → FMPose3D: monocular
  • Paper title reference: "FMPose: 3D Pose Estimation via Flow Matching" → "FMPose3D: monocular 3D Pose Estimation via Flow Matching"
  • Accepted by IEEE Transactions on Multimedia (TMM), 2025. → Licensed under Apache 2.0

• Added scripts/update_headers.py: Automation script to find and replace headers across all Python files in the repository. Searches for exact old header pattern and replaces with new format.

• Added .gitignore: Standard Python exclusions for cache and build artifacts.

Before/After

# Before
"""
FMPose: 3D Pose Estimation via Flow Matching

Official implementation of the paper:
"FMPose: 3D Pose Estimation via Flow Matching"
by Ti Wang, Xiaohang Yu, and Mackenzie Weygandt Mathis
Accepted by IEEE Transactions on Multimedia (TMM), 2025.
"""

# After
"""
FMPose3D: monocular 3D Pose Estimation via Flow Matching

Official implementation of the paper:
"FMPose3D: monocular 3D Pose Estimation via Flow Matching"
by Ti Wang, Xiaohang Yu, and Mackenzie Weygandt Mathis
Licensed under Apache 2.0
"""

Original prompt

---

This section details on the original issue you should resolve

<issue_title>change header in code</issue_title>
<issue_description>from

"""
FMPose: 3D Pose Estimation via Flow Matching

Official implementation of the paper:
"FMPose: 3D Pose Estimation via Flow Matching"
by Ti Wang, Xiaohang Yu, and Mackenzie Weygandt Mathis
Accepted by IEEE Transactions on Multimedia (TMM), 2025.
"""

to:

"""
FMPose3D: monocular 3D Pose Estimation via Flow Matching

Official implementation of the paper:
"FMPose: 3D Pose Estimation via Flow Matching"
by Ti Wang, Xiaohang Yu, and Mackenzie Weygandt Mathis
Licensed under Apache 2.0
"""</issue_description>

<agent_instructions>please make a script to automate changing of all file headers</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes change header in code #2

---

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[MMathisLab]

@copilot change after to be:

Official implementation of the paper:
"FMPose3D: monocular 3D Pose Estimation via Flow Matching"
by Ti Wang, Xiaohang Yu, and Mackenzie Weygandt Mathis
Licensed under Apache 2.0

[Copilot]

@copilot change after to be:

Official implementation of the paper:

...

Updated the paper title in the header to "FMPose3D: monocular 3D Pose Estimation via Flow Matching" in commit c0caea0.