Remove redundant get-last-build command

[Copilot]

The get-last-build command duplicated functionality already provided by get-job, which returns last build information (number and status).

Changes

CLI (main.go)

• Removed get-last-build command case and getLastBuild() function
• Updated help text

MCP Server (mcp.go)

• Removed get_last_build tool registration and getLastBuildHandler() function

Documentation (README.md)

• Removed command from usage examples and MCP tools list

Users needing last build details should use get-job <job-name> which displays:

Last Build:          #42 - SUCCESS
Last Success:        #42
Last Failed:         #38

Original prompt

Remove the "get-last-build" command. This information is already returned by "get-job".

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