[geonnave]

Based on main. #344 (place --to-calibration) stacks on this one.

Problem

calibrate-lh2 collect --spin --append ID rightly refuses a calibration already placed on a site (its frame is the site's, and a re-solve would not keep it), but the error only said "append to the spin calibration it was made from", leaving the operator to find which one. On the bench that meant reading anchors by hand, and the anchor can mislead: a calibration aligned into a site init site carries that site's anchor, which names the site's original spin calibration, not the one it was actually moved from.

Change

• A placed calibration records placed_from = "<id>" in [metadata]: the full id of the free-frame calibration it came from. site init sets it. It is outside the id hash, like tag, since it moves no position.
• The refusal now names that calibration and, when its file is found under any site, the flags to use: ...: it was placed from spin calibration 4414d748, so append to that one (--append 4414d748 --site virmond-rooms).
• Files written before this have no placed_from; for those the self-defined from spin calibration <id8> anchor that site init writes is the fallback, worded as "its site was defined from spin calibration ..." since that is all it proves.
• show --next-round shares the check, so it gets the same message.

Validation

Unit, both through the CLI with a faked swarm: a site init-placed calibration refused with the source id and --site c405, and nothing sent to the robots; the same file with placed_from stripped falls back to the anchor. Full suite: 1789 passed, 2 failed that fail identically on the base commit in this environment (test_camera_service::test_a_registration_without_controls_warns_about_nothing, and test_controller_dotbot_simulator, which could not bind its port). Not run on hardware. Formatting is deferred to the pass after review.

File	+	-
dotbot/tests/test_calibration_spin.py	+41	-0
dotbot/calibration/multi_station.py	+20	-4
dotbot/calibration/lighthouse2.py	+14	-0
dotbot/calibration/conics.py	+4	-1
Total, 4 files	+79	-5

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.57%. Comparing base (7a76840) to head (9ddf837).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #343      +/-   ##
==========================================
+ Coverage   88.56%   88.57%   +0.01%     
==========================================
  Files         230      230              
  Lines       37623    37650      +27     
  Branches     2367     2367              
==========================================
+ Hits        33319    33347      +28     
+ Misses       4300     4299       -1     
  Partials        4        4              

Flag	Coverage Δ
console	82.18% <ø> (ø)
python	91.45% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
dotbot/tests/test_calibration_spin.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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