[0.60.5] Preserve SSH username case in remote sessions

[Finesssee]

Summary

• Port upstream b88c78718da1372c341dae2cde6d53b830a1c813.
• Preserve SSH usernames exactly while deduplicating only the hostname case-insensitively.
• Keep the first destination spelling and the existing validation and SSH command behavior.

Validation

• cargo fmt --all -- --check
• git diff --check
• CARGO_TARGET_DIR=C:\Users\mac\AppData\Local\Temp\wcb-wave2-553-target cargo test --manifest-path rust/Cargo.toml agent_sessions --lib (56 passed)

This PR is intentionally scoped to the Windows remote-session host normalization path and is ready for review. It is not merged.

Summary by CodeRabbit

• Bug Fixes

  • Host entries are now deduplicated case-insensitively by hostname while preserving differences in SSH username casing.
  • Entries such as Alice@host and alice@host remain distinct, while equivalent host-only entries are consolidated.

• Tests

  • Added coverage verifying username-case preservation and hostname deduplication during host sanitization and merging.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: ba5d0c0f-64ea-4d8f-8710-9d0ac25adfae

📥 Commits

Reviewing files that changed from the base of the PR and between 10e3b09 and 0daf189.

📒 Files selected for processing (2)

• rust/src/agent_sessions/remote.rs
• rust/src/agent_sessions/tests.rs

Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review.

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📝 Walkthrough

Walkthrough

The change adds hostname-aware deduplication for remote hosts. It preserves SSH username case, lowercases hostname comparisons, updates fetch filtering and host sanitization, and adds coverage for these cases.

Changes

SSH host deduplication

Layer / File(s)	Summary
Hostname-aware deduplication key rust/src/agent_sessions/remote.rs	Adds host_dedup_key, which trims hosts, preserves username case, and lowercases the hostname component.
Deduplication integration and validation rust/src/agent_sessions/remote.rs, rust/src/agent_sessions/tests.rs	Updates fetch filtering and sanitized_hosts to use the new key. Tests verify distinct username casing and case-insensitive hostname deduplication.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: preserving SSH username case in remote sessions.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Commit to this branch
• Create a new PR

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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