Draft: MID: put arbiter on manager scene

Mostly a stripped-down version of !115. Prepared so I can deploy at MID. At the time of writing, they haven't responded with "go", but just in case, here are the changes made visible.

For actually merging something someday, we should decide on !115

assigned to @hammerd

added 11 commits

• 637b24f4...1bcaf277 - 3 commits from branch master
• f3dd2ce6 - DRY geometry retrieval, DA go to error when no geometry
• dc270d84 - Addons get notified of new geometry
• 43e78f05 - Arbiter kernels get notified of new geometry
• 0a7f5ffd - Fix arbiter geometry stuff
• 6a73ea3c - Manager no longer needs to worry about sendGeometry
• 02a09112 - Use geometryState to indicate geometry state
• 8678bca9 - Add cool scene
• bb5fa6db - Merge branch 'detectorassembler-error-without-geometry' into mid-arbiter-on-scene

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Discussed on dev team meeting:

• Try rebasing on master as the diff seems to contain some other changes
• Not ideal to wait on other devices in requestScene
• Better solution is to make arbiter first class citizen of managed devices

added 47 commits

• bb5fa6db...c0ed1a51 - 46 commits from branch master
• 5fd3fc48 - Merge branch 'master' into mid-arbiter-on-scene

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added 20 commits

• 5fd3fc48...ca6256ba - 18 commits from branch master
• cb82cd89 - Reorder things in some addons' init
• d438abc7 - Merge branch '2025-winter-bud-fixes' into mid-arbiter-on-scene

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added 5 commits

• 7cb8ffbe - Add managerDevice property to Gotthard2Assembler
• 1a000acb - Maybe fix: np.asarray, let it decide whether to copy
• 0513477a - Fix weighted ss / fs indices (thought I did already)
• 74d39b40 - Merge branch '2025-winter-bud-fixes' of...
• 0aeb426f - Merge branch '2025-winter-bud-fixes' into mid-arbiter-on-scene

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Indeed, I had already fixed this while testing at FXE: https://git.xfel.eu/calibration/calng/-/blob/7f8b59d3485bd9ce4d716ac42094b806756202ac/src/calng/kernels/peakfinder9_gpu.cu I guess I missed this when merging relevant bits from then

added 3 commits

• 0aeb426f...5a383dc3 - 2 commits from branch master
• 94c03e01 - Merge branch 'master' into mid-arbiter-on-scene

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