[fivetran-paulharper]

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🟢 Approval recommended

No active review issues remain for the change enabling manager updates independently of the agent container.

No open issues 🎉

What changed in this PR

Adds update-manager to the Bash and PowerShell management scripts so users can update the manager independently of the agent container, without restarting it or requiring valid agent configuration.

Changes:

• Downloads and validates a replacement script before replacing the installed manager, with temporary-file cleanup.
• Adds tests for successful updates, URL overrides, proxy use, and failed or invalid downloads.
• Documents the new command and manual update steps for older installations.

File	Description
tests/​pwsh/​Manager.Tests.ps1	Adds PowerShell update tests and download stubbing.
tests/​bash/​stubs/​curl	Supports output files and simulated download failures.
tests/​bash/​manager.bats	Tests Bash updates, configuration independence, and failure cleanup.
README.md	Documents manager updates and migration from older installations.
proxy-agent-manager.sh	Implements Bash self-update before agent configuration validation.
proxy-agent-manager.ps1	Implements PowerShell self-update with proxy support and syntax validation.

_{Review effort: Balanced}