docs: fix proxy_command examples to use explicit hostname:port instead of %h:%p

[Copilot]

The current documentation and examples incorrectly show proxy_command using OpenSSH-style %h:%p placeholders, but Paramiko's ProxyCommand doesn't support these placeholders like OpenSSH does. This leads to connection failures when users try to use the documented examples.

Problem

The documentation in doc/context.md and example in examples/machine/ssh_proxy_command.json show:

"proxy_command": "ssh -W %h:%p -i ~/.ssh/jump_key jumpuser@bastion.company.com"

However, Paramiko's ProxyCommand expects explicit hostname and port values, not placeholders. The working tests in tests/test_ssh_jump_host.py already use the correct format:

"proxy_command": "ssh -W server:22 -i /root/.ssh/id_rsa root@jumphost"

Solution

This PR updates the documentation and examples to use the correct explicit hostname:port format that works with Paramiko:

• Documentation: Changed example to use internal-server.company.com:22 instead of %h:%p
• Example file: Updated ssh_proxy_command.json to match the working format
• Added explanation: Clarified the difference between OpenSSH and Paramiko proxy command requirements
• Cleanup: Removed accidentally committed temporary files and improved .gitignore patterns

Technical Details

The code implementation was already correct - it expects explicit hostname:port values in proxy_command and properly converts them to %h:%p for rsync compatibility when needed. Only the documentation needed fixing to match the actual working implementation.

Users can now follow the examples without encountering connection failures due to unsupported placeholder syntax.

Fixes #541.

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[njzjz]

@copilot some temp files were committed.

[Copilot]

@copilot some temp files were committed.

Fixed! I've removed the accidentally committed temporary files (45ffe83b7c78ffd08fa475de2fe0425bcad0969a.json, err, log) and improved the .gitignore to prevent similar issues in the future. The commit hash is a59dd5b.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.32%. Comparing base (f4371f9) to head (a59dd5b).
⚠️ Report is 1 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (f4371f9) and HEAD (a59dd5b). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (f4371f9)	HEAD (a59dd5b)
	15	14

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #542       +/-   ##
===========================================
- Coverage   60.17%   47.32%   -12.86%     
===========================================
  Files          39       39               
  Lines        3905     3905               
===========================================
- Hits         2350     1848      -502     
- Misses       1555     2057      +502     

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