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, 48 deletions

diff --git a/vendor/ryu/src/pretty/exponent.rs b/vendor/ryu/src/pretty/exponent.rs
deleted file mode 100644
index 529d92ba..00000000
--- a/vendor/ryu/src/pretty/exponent.rs
+++ /dev/null
@@ -1,48 +0,0 @@
-use crate::digit_table::DIGIT_TABLE;
-use core::ptr;
-
-#[cfg_attr(feature = "no-panic", inline)]
-pub unsafe fn write_exponent3(mut k: isize, mut result: *mut u8) -> usize {
-    let sign = k < 0;
-    if sign {
-        *result = b'-';
-        result = result.offset(1);
-        k = -k;
-    }
-
-    debug_assert!(k < 1000);
-    if k >= 100 {
-        *result = b'0' + (k / 100) as u8;
-        k %= 100;
-        let d = DIGIT_TABLE.as_ptr().offset(k * 2);
-        ptr::copy_nonoverlapping(d, result.offset(1), 2);
-        sign as usize + 3
-    } else if k >= 10 {
-        let d = DIGIT_TABLE.as_ptr().offset(k * 2);
-        ptr::copy_nonoverlapping(d, result, 2);
-        sign as usize + 2
-    } else {
-        *result = b'0' + k as u8;
-        sign as usize + 1
-    }
-}
-
-#[cfg_attr(feature = "no-panic", inline)]
-pub unsafe fn write_exponent2(mut k: isize, mut result: *mut u8) -> usize {
-    let sign = k < 0;
-    if sign {
-        *result = b'-';
-        result = result.offset(1);
-        k = -k;
-    }
-
-    debug_assert!(k < 100);
-    if k >= 10 {
-        let d = DIGIT_TABLE.as_ptr().offset(k * 2);
-        ptr::copy_nonoverlapping(d, result, 2);
-        sign as usize + 2
-    } else {
-        *result = b'0' + k as u8;
-        sign as usize + 1
-    }
-}