Fix SimpleOutput to drop annotations for items failing contains subschema

[staging-devin-ai-integration]

Fix SimpleOutput to drop annotations for items failing contains subschema

Summary

The SimpleOutput collector was incorrectly retaining annotations (e.g. title) from array items that fail against a contains subschema. For example, given:

{ "contains": { "type": "number", "title": "Test" } }

and instance ["foo", 42, true], the title annotation was being kept for /0 and /2 even though those items don't match the contains subschema. Only /1 (42) should retain it.

Root cause: The mask system uses an early return to suppress errors within a contains context (since only one match is needed). However, this early return also skipped the annotation cleanup code, so annotations from failing items were never dropped.

Fix: Before the early return in the contains mask path (!entry.second), iterate annotations and erase those matching both the failing evaluate_path (via starts_with_initial) and the failing instance_location (via starts_with). This mirrors the existing cleanup logic but scopes it to the specific instance location that failed.

Three new tests are added covering:

1. Mixed pass/fail items — only passing item retains annotations
2. All items pass — all annotations retained (regression guard)
3. All items fail — no annotations retained

Review & Testing Checklist for Human

• Verify the instance_location.starts_with() filter doesn't over-erase annotations in nested contains scenarios (e.g. contains with object subschemas that produce annotations at sub-paths like /0/foo)
• Consider whether minContains/maxContains edge cases need additional test coverage (same LoopContains handler is used, but no explicit tests added)
• Confirm the annotation cleanup only fires for the contains mask (!entry.second) and doesn't affect anyOf/oneOf/not/if paths which use entry.second == true

Notes

• All existing tests pass including the official JSON Schema test suite
• make confirms no formatting changes remain
• Requested by: bot_apk
• Session: https://staging.itsdev.in/sessions/d6996f888a8741059d44a94410403ba8

[staging-devin-ai-integration]

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