v1.87.1

## Verify Docker Image Signature

All LiteLLM Docker images are signed with [cosign](https://docs.sigstore.dev/cosign/overview/). Every release is signed with the same key introduced in [commit `0112e53`](https://github.com/BerriAI/litellm/commit/0112e53046018d726492c814b3644b7d376029d0).

**Verify using the pinned commit hash (recommended):**

A commit hash is cryptographically immutable, so this is the strongest way to ensure you are using the original signing key:

```bash
cosign verify \
  --key https://raw.githubusercontent.com/BerriAI/litellm/0112e53046018d726492c814b3644b7d376029d0/cosign.pub \
  ghcr.io/berriai/litellm:v1.87.1
```

**Verify using the release tag (convenience):**

Tags are protected in this repository and resolve to the same key. This option is easier to read but relies on tag protection rules:

```bash
cosign verify \
  --key https://raw.githubusercontent.com/BerriAI/litellm/v1.87.1/cosign.pub \
  ghcr.io/berriai/litellm:v1.87.1
```

Expected output:

```
The following checks were performed on each of these signatures:
  - The cosign claims were validated
  - The signatures were verified against the specified public key
```

---
## What's Changed
* chore(release): backport five staged fixes into stable/1.87.x and cut 1.87.1 by @mateo-berri in https://github.com/BerriAI/litellm/pull/29631
* chore(release): backport #29612 (session-token budget-ceiling exemption) into stable/1.87.x and cut 1.87.2 by @mateo-berri in https://github.com/BerriAI/litellm/pull/29636
* chore: restore stable/1.87.x to 1.87.1 (revert premature 1.87.2 bump) by @mateo-berri in https://github.com/BerriAI/litellm/pull/29645


**Full Changelog**: https://github.com/BerriAI/litellm/compare/v1.87.0...v1.87.1