supabase / supabase / 29559835631

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fix(studio): mirror Vercel interstitial layout change into TanStack routes (#48024)

## Linked Issue

Closes #6362

## Description

The failure fallback in four reranker providers (Cohere, HuggingFace,
SentenceTransformer, ZeroEntropy) was writing `rerank_score = 0.0`
directly onto the input dicts, while every success path copies before
attaching the score (LLMReranker even copies on its per-document failure
path). Since `Memory.search()` hands its live result list to `rerank()`
(`mem0/memory/main.py:1458`, async twin near line 3096), one transient
provider failure permanently stamped the caller's memory dicts from a
call that looked successful.

This copies each dict in the fallback loop before setting the sentinel,
matching the success-path contract. Fallback behavior is otherwise
untouched: original order, 0.0 sentinel, config `top_k` slice.

The new test file is parametrized over all four providers and proves the
regression both ways: all 12 cases fail on main and pass with the fix.
Providers are constructed via `object.__new__` with stubbed attributes
so the tests run without the optional heavy deps (cohere, transformers,
sentence-transformers, zeroentropy) installed.

## Type of Change

- [x] Bug fix (non-breaking change that fixes an issue)
- [ ] New feature (non-breaking change that adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Refactor (no functional changes)
- [ ] Documentation update

## Breaking Changes

N/A

## Test Coverage

- [x] I added/updated unit tests
- [ ] I added/updated integration tests
- [x] I tested manually (describe below)
- [ ] No tests needed (explain why)

Ran `make lint` (clean) and `make test-py-3.11` (1687 passed; the two
Redis e2e failures are pre-existing on main and only trigger because a
local Redis happens to be reachable on my machine, they are skipped in
CI). Also verified the new tests fail without the provider changes.

## Checklist

- [x] M... (continued)

1211 of 1669 branches covered (72.56%)

Branch coverage included in aggregate %.

1784 of 2371 relevant lines covered (75.24%)

240.23 hits per line