feat(limits): add delete_limits_set API

[jmthomas]

Summary

Adds a delete_limits_set(name) API (Ruby + Python) to remove a limits set, as requested in #3464.

Cleanup performed:

1. Removes the set key from every TLM item definition in TargetModel packets
2. Removes the set from each item blob in <scope>__current_limits_settings
3. hdel the set from <scope>__limits_sets
4. Stream openc3_limits_events needs no cleanup (append-only, capped at 1000)

Guards: refuses to delete DEFAULT, the currently active set, or a non-existent set.

Design decisions (the open questions in the issue)

• Cleans up TargetModel packet item definitions too (not just current_limits_settings) for a complete removal.
• No new LIMITS_DELETE_SET event type. That would require new Limits#remove_set infrastructure; a deleted (non-active) set lingering in a running microservice's memory is harmless and is cleared on the next restart/resync from current_limits_settings.

Performance

• Packet-definition cleanup writes per packet, not per item (≤ N packet hset calls).
• current_limits_settings cleanup is batched into a single hmset/hset mapping rather than one Redis round trip per item — important since this hash can be large (e.g. 100 packets × 1000 items).

Changes

Area	File
Ruby API	openc3/lib/openc3/api/limits_api.rb
Ruby topic	openc3/lib/openc3/topics/limits_event_topic.rb
Ruby script wrapper	openc3/lib/openc3/script/limits.rb
Python API	openc3/python/openc3/api/limits_api.py
Python topic	openc3/python/openc3/topics/limits_event_topic.py
Python script wrapper	openc3/python/openc3/script/limits.py
JS API binding	openc3-js-common/src/services/openc3Api.js
Docs	docs.openc3.com/docs/guides/scripting-api.md
Tests	Ruby specs ×2, Python test ×1

Testing

• Ruby: limits api/script/topic specs pass
• Python: limits api/topic tests pass
• ruff + eslint clean

Closes #3464

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate failed

Failed conditions
3 New issues

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.24%. Comparing base (f29c725) to head (1009613).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3493      +/-   ##
==========================================
- Coverage   79.25%   79.24%   -0.01%     
==========================================
  Files         689      689              
  Lines       57293    57358      +65     
  Branches      728      728              
==========================================
+ Hits        45406    45452      +46     
- Misses      11809    11828      +19     
  Partials       78       78              

Flag	Coverage Δ
python	80.30% <ø> (+0.02%)	⬆️
ruby-api	80.95% <ø> (-0.38%)	⬇️
ruby-backend	83.11% <100.00%> (+0.01%)	⬆️

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