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, 103 deletions

diff --git a/vendor/syn/tests/test_parse_buffer.rs b/vendor/syn/tests/test_parse_buffer.rs
deleted file mode 100644
index 62abc6d2..00000000
--- a/vendor/syn/tests/test_parse_buffer.rs
+++ /dev/null
@@ -1,103 +0,0 @@
-#![allow(clippy::non_ascii_literal)]
-
-use proc_macro2::{Delimiter, Group, Ident, Punct, Spacing, TokenStream, TokenTree};
-use std::panic;
-use syn::parse::discouraged::Speculative as _;
-use syn::parse::{Parse, ParseStream, Parser, Result};
-use syn::{parenthesized, Token};
-
-#[test]
-#[should_panic(expected = "fork was not derived from the advancing parse stream")]
-fn smuggled_speculative_cursor_between_sources() {
-    struct BreakRules;
-    impl Parse for BreakRules {
-        fn parse(input1: ParseStream) -> Result<Self> {
-            let nested = |input2: ParseStream| {
-                input1.advance_to(input2);
-                Ok(Self)
-            };
-            nested.parse_str("")
-        }
-    }
-
-    syn::parse_str::<BreakRules>("").unwrap();
-}
-
-#[test]
-#[should_panic(expected = "fork was not derived from the advancing parse stream")]
-fn smuggled_speculative_cursor_between_brackets() {
-    struct BreakRules;
-    impl Parse for BreakRules {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let a;
-            let b;
-            parenthesized!(a in input);
-            parenthesized!(b in input);
-            a.advance_to(&b);
-            Ok(Self)
-        }
-    }
-
-    syn::parse_str::<BreakRules>("()()").unwrap();
-}
-
-#[test]
-#[should_panic(expected = "fork was not derived from the advancing parse stream")]
-fn smuggled_speculative_cursor_into_brackets() {
-    struct BreakRules;
-    impl Parse for BreakRules {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let a;
-            parenthesized!(a in input);
-            input.advance_to(&a);
-            Ok(Self)
-        }
-    }
-
-    syn::parse_str::<BreakRules>("()").unwrap();
-}
-
-#[test]
-fn trailing_empty_none_group() {
-    fn parse(input: ParseStream) -> Result<()> {
-        input.parse::<Token![+]>()?;
-
-        let content;
-        parenthesized!(content in input);
-        content.parse::<Token![+]>()?;
-
-        Ok(())
-    }
-
-    // `+ ( + «∅ ∅» ) «∅ «∅ ∅» ∅»`
-    let tokens = TokenStream::from_iter([
-        TokenTree::Punct(Punct::new('+', Spacing::Alone)),
-        TokenTree::Group(Group::new(
-            Delimiter::Parenthesis,
-            TokenStream::from_iter([
-                TokenTree::Punct(Punct::new('+', Spacing::Alone)),
-                TokenTree::Group(Group::new(Delimiter::None, TokenStream::new())),
-            ]),
-        )),
-        TokenTree::Group(Group::new(Delimiter::None, TokenStream::new())),
-        TokenTree::Group(Group::new(
-            Delimiter::None,
-            TokenStream::from_iter([TokenTree::Group(Group::new(
-                Delimiter::None,
-                TokenStream::new(),
-            ))]),
-        )),
-    ]);
-
-    parse.parse2(tokens).unwrap();
-}
-
-#[test]
-fn test_unwind_safe() {
-    fn parse(input: ParseStream) -> Result<Ident> {
-        let thread_result = panic::catch_unwind(|| input.parse());
-        thread_result.unwrap()
-    }
-
-    parse.parse_str("throw").unwrap();
-}