Remove git submodules

[xingyaoww]

Summary

This PR removes all git submodules from the repository.

Changes

• Removed agent-sdk submodule that was in an inconsistent state
  • The .gitmodules file was already missing
  • The gitlink (160000 mode entry) remained in the git index
  • This caused errors when running git submodule status

Verification

• Confirmed the submodule was registered using git ls-files --stage | grep 160000
• Removed using git rm --cached agent-sdk
• Repository is now clean of all submodule references

@xingyaoww can click here to continue refining the PR

[enyst]

@OpenHands Merge main into this PR branch and fix the conflict.

[openhands-ai]

I'm on it! enyst can track my progress at all-hands.dev

[enyst]

I had the impression we already deleted it

[openhands-ai]

Final summary of work completed

What I did:

• Merged main into the PR branch remove-git-submodules
• Resolved the merge conflict on agent-sdk by keeping the deletion (aligned with the PR’s goal to remove submodules)
• Accepted upstream updates to .openhands/microagents/repo.md from main
• Committed and pushed the merge resolution

Verification:

• No gitlinks remain in the index (no entries with mode 160000)
• agent-sdk directory is removed from the tree
• Only change introduced by the merge is updating .openhands/microagents/repo.md; no extraneous changes

Commit:

• a57cdb1 — merge: main into remove-git-submodules; resolve conflict by keeping agent-sdk removal and accepting upstream doc changes

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