ent-v2.1.1-base

## What's Changed
* enterprise docs by @akshaydeo in https://github.com/maximhq/bifrost/pull/6998
* updated release notes for github copilot by @akshaydeo in https://github.com/maximhq/bifrost/pull/6999
* docs : lakera to checkpoint name change by @Madhuvod in https://github.com/maximhq/bifrost/pull/7000
* docs: update virtual-key and project error shapes to top-level `type` with corrected codes, messages, and new `mcp_tool_blocked` example by @Pratham-Mishra04 in https://github.com/maximhq/bifrost/pull/7006
* docs: refresh projects screenshots and remove stale images and screenshot-only frames by @Pratham-Mishra04 in https://github.com/maximhq/bifrost/pull/7007
* docs: clarify caller definition, link Access Profiles, and rename `principal_only` to "User only" in projects docs by @Pratham-Mishra04 in https://github.com/maximhq/bifrost/pull/7008
* docs: remove `mcp-tool-groups` from nav and references, fix broken project link in virtual-mcps by @Pratham-Mishra04 in https://github.com/maximhq/bifrost/pull/7009
* feat: trust upstream-stamped user identity before JWT verification in MCP server auth by @Pratham-Mishra04 in https://github.com/maximhq/bifrost/pull/7010
* fix: record per-mode grant identity in `injectJWTContext` so vk-mode tokens settle as a key credential and session-mode tokens record nothing by @Pratham-Mishra04 in https://github.com/maximhq/bifrost/pull/7011
* chore: fix indentation in `virtualKeySheet.tsx` by @Pratham-Mishra04 in https://github.com/maximhq/bifrost/pull/7015
* dependeabot fixes by @akshaydeo in https://github.com/maximhq/bifrost/pull/7019
* main-backmerge by @akshaydeo in https://github.com/maximhq/bifrost/pull/7020
* [fix]: Preserve document blocks in Bedrock tool results by @michaeldunn9 in https://github.com/maximhq/bifrost/pull/5663
* fix: vk UI for managed keys by @roroghost17 in https://github.com/maximhq/bifrost/pull/7025
* feat: add overhead exports functionality to telemetry and otel metric exporters by @roroghost17 in https://github.com/maximhq/bifrost/pull/6980
* claude cowork proxy support by @akshaydeo in https://github.com/maximhq/bifrost/pull/7012
* version bump by @akshaydeo in https://github.com/maximhq/bifrost/pull/7028
* test fixes and closes #6974 by @akshaydeo in https://github.com/maximhq/bifrost/pull/6993

## New Contributors
* @michaeldunn9 made their first contribution in https://github.com/maximhq/bifrost/pull/5663

**Full Changelog**: https://github.com/maximhq/bifrost/compare/ent-v2.1.0-base...ent-v2.1.1-base