feat(oz): support cloning GitLab environment repos

[captainsafia]

Description

Support cloning GitLab repositories during local Warp/Oz cloud environment setup.

• Add provider-neutral environment repository modeling with legacy GitHub compatibility.
• Resolve omitted source-repository forges from the environment's configured code forge.
• Use forge-aware clone URLs throughout environment cloning, registration, indexing, MCP discovery, and skill loading.
• Store credentials for all managed git hosts while keeping GitHub CLI configuration GitHub-only.
• Log non-sensitive credential injection diagnostics without exposing tokens, usernames, or emails.

Implementation plan: https://staging.warp.dev/drive/notebook/VPOgs3sL5WvVNxr1BRONAW
Agent conversation: https://staging.warp.dev/conversation/940bd50f-1875-43fb-a5b2-ab3f87274969

Linked Issue

REMOTE-1861

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Screenshots or videos are not applicable because this change has no UI changes.

Testing

• ./script/format
• cargo clippy --workspace --exclude warp_completer --all-targets --tests -- -D warnings
• cargo clippy -p warp_completer --all-targets --tests -- -D warnings
• cargo test -p cloud_object_models
• Focused environment cloning and git credential tests
• I have manually tested my changes locally with ./script/run

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

CHANGELOG-OZ: Support cloning GitLab repositories during cloud environment setup.

Co-Authored-By: Oz oz-agent@warp.dev

[oz-for-oss]

@captainsafia

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[oz-for-oss]

Overview

This PR adds provider-neutral cloud environment repository modeling, routes GitLab repositories through forge-aware clone URLs, updates environment repo cloning/skill-loading flows to use SourceRepo, and extends git credential writing so non-GitHub hosts are available to git while keeping gh configuration GitHub-only.

Concerns

• No blocking correctness, security, or spec-drift concerns found in the attached diff.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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