fix(server): ladder multi-account skip test + naming/comment follow-ups (closes #1370)

[cristim]

What

Closes #1370 (follow-ups from the #1362 pre-merge review):

1. New test TestHandleLadderRun_MultiAccountSkip_CountedAndIsolated: a config whose ExternalID does not match the resolved caller account is visibly counted SkippedMultiAccount==1, persists nothing, and a healthy config still processes (isolation). Verified the test fails when the account comparison is inverted.
2. Renamed cap -> capability (builtin shadow).
3. Corrected the unknown-cadence comment (error surfaces in ladderConfigToEngine, pre-persist, fail-loud).

Gates all exit 0: build, vet, go test ./internal/server/... (402), gocyclo.

Part of LeanerCloud/cloud-commitments-platform#70. Tracker LeanerCloud/cloud-commitments-go#27.

Summary by CodeRabbit

• Bug Fixes
  • Improved ladder run handling for configurations linked to different cloud accounts.
  • Such configurations are now correctly skipped and counted without preventing eligible configurations from running.
  • Invalid cadence values are surfaced earlier with clearer validation behavior.

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📝 Walkthrough

Walkthrough

The ladder handler renames a capability variable, clarifies cadence validation behavior, and adds coverage ensuring mismatched multi-account configurations are skipped and isolated while matching configurations continue successfully.

Changes

Ladder run eligibility

Layer / File(s)	Summary
Multi-account skip isolation and handler cleanup internal/server/handler_ladder_test.go, internal/server/handler_ladder.go	Adds coverage for counted, non-persisted multi-account skips and continued processing of healthy configurations; renames the capability variable and updates the unknown-cadence validation comment.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main changes: ladder test follow-up plus naming/comment fixes.
Linked Issues check	✅ Passed	The PR implements all requested follow-ups: multi-account skip test, cap rename, and cadence comment fix.
Out of Scope Changes check	✅ Passed	No unrelated code changes are introduced beyond the linked issue follow-ups.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ladder-1370-followups

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[cristim]

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[cristim]

Merged to main (closes #1370): positive multi-account skip test (proven to fail when the account comparison is inverted), cap->capability builtin-shadow rename, corrected cadence comment. CodeRabbit clean, functional CI green.