feat: migrate from Cedar to SpiceDB authorization system

This is a major architectural change that replaces the Cedar policy-based
authorization system with SpiceDB's relation-based authorization.

Key changes:

- Migrate from Rust to Go implementation
- Replace Cedar policies with SpiceDB schema and relationships
- Switch from envoy `ext_authz` with Cedar to SpiceDB permission checks
- Update build system and dependencies for Go ecosystem
- Maintain Envoy integration for external authorization

This change enables more flexible permission modeling through SpiceDB's
Google Zanzibar inspired relation-based system, supporting complex
hierarchical permissions that were difficult to express in Cedar.

Breaking change: Existing Cedar policies and Rust-based configuration
will no longer work and need to be migrated to SpiceDB schema.

1 files changed, 0 insertions, 76 deletions

diff --git a/vendor/writeable/Cargo.toml b/vendor/writeable/Cargo.toml
deleted file mode 100644
index 049fe83e..00000000
--- a/vendor/writeable/Cargo.toml
+++ /dev/null
@@ -1,76 +0,0 @@
-# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
-#
-# When uploading crates to the registry Cargo will automatically
-# "normalize" Cargo.toml files for maximal compatibility
-# with all versions of Cargo and also rewrite `path` dependencies
-# to registry (e.g., crates.io) dependencies.
-#
-# If you are reading this file be aware that the original Cargo.toml
-# will likely look very different (and much more reasonable).
-# See Cargo.toml.orig for the original contents.
-
-[package]
-edition = "2021"
-rust-version = "1.81"
-name = "writeable"
-version = "0.6.1"
-authors = ["The ICU4X Project Developers"]
-build = false
-include = [
-    "data/**/*",
-    "src/**/*",
-    "examples/**/*",
-    "benches/**/*",
-    "tests/**/*",
-    "Cargo.toml",
-    "LICENSE",
-    "README.md",
-]
-autolib = false
-autobins = false
-autoexamples = false
-autotests = false
-autobenches = false
-description = "A more efficient alternative to fmt::Display"
-readme = "README.md"
-license = "Unicode-3.0"
-repository = "https://github.com/unicode-org/icu4x"
-
-[package.metadata.docs.rs]
-all-features = true
-
-[package.metadata.workspaces]
-independent = true
-
-[features]
-either = ["dep:either"]
-
-[lib]
-name = "writeable"
-path = "src/lib.rs"
-bench = false
-
-[[example]]
-name = "writeable_message"
-path = "examples/writeable_message.rs"
-
-[[test]]
-name = "writeable"
-path = "tests/writeable.rs"
-
-[[bench]]
-name = "writeable"
-path = "benches/writeable.rs"
-harness = false
-
-[dependencies.either]
-version = "1.9.0"
-optional = true
-default-features = false
-
-[dev-dependencies.rand]
-version = "0.8"
-features = ["small_rng"]
-
-[target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies.criterion]
-version = "0.5.0"