refactor: remove deprecated tools/file_operations_component

The Rust-based file_operations_component has been superseded by:
- tools/file_ops (Go implementation) - current production path
- tools/file_ops_external (WASM component with AOT) - preferred path

Changes:
- Delete tools/file_operations_component directory (Rust CLI)
- Move WIT interface definition to tools/file_ops/wit/
- Update all toolchain references to use //tools/file_ops:wit_files
- Update dual_implementation tests to use Go implementation
- Remove dependabot entry for deleted Cargo.toml

This removes ~600 lines of unused Rust code and simplifies the
file operations toolchain architecture.

Author: avrabe

.github/dependabot.yml

@@ -81,26 +81,6 @@ updates:
       - "automated"
       - "performance"
 
-  - package-ecosystem: "cargo"
-    directory: "/tools/file_operations_component"
-    schedule:
-      interval: "weekly"
-      day: "monday"
-      time: "06:00"
-    open-pull-requests-limit: 10
-    reviewers:
-      - "avrabe"
-    assignees:
-      - "avrabe"
-    commit-message:
-      prefix: "rust/file-ops"
-      include: "scope"
-    labels:
-      - "dependencies"
-      - "rust"
-      - "automated"
-      - "wasm"
-
   - package-ecosystem: "cargo"
     directory: "/tools-builder/toolchains"
     schedule:

test/dual_implementation/BUILD.bazel

@@ -6,28 +6,29 @@ load("//toolchains:dual_file_ops_toolchain.bzl", "dual_file_ops_toolchain")
 package(default_visibility = ["//visibility:public"])
 
 # Test dual toolchain with actual components
+# Uses Go-based file_ops for both implementations (production pattern)
 dual_file_ops_toolchain(
     name = "test_dual_toolchain",
     implementation_preference = "auto",
-    rust_component = "//tools/file_operations_component:file_ops",  # Actual Rust implementation
-    tinygo_component = "//tools/file_operations_component:file_ops",  # Current Rust implementation as mock TinyGo
-    wit_files = ["//tools/file_operations_component:wit_files"],
+    rust_component = "//tools/file_ops:file_ops",
+    tinygo_component = "//tools/file_ops:file_ops",
+    wit_files = ["//tools/file_ops:wit_files"],
 )
 
 # Test security-focused configuration
 dual_file_ops_toolchain(
     name = "test_security_toolchain",
     implementation_preference = "tinygo",
-    tinygo_component = "//tools/file_operations_component:file_ops",
-    wit_files = ["//tools/file_operations_component:wit_files"],
+    tinygo_component = "//tools/file_ops:file_ops",
+    wit_files = ["//tools/file_ops:wit_files"],
 )
 
 # Test performance-focused configuration
 dual_file_ops_toolchain(
     name = "test_performance_toolchain",
     implementation_preference = "rust",
-    rust_component = "//tools/file_operations_component:file_ops",
-    wit_files = ["//tools/file_operations_component:wit_files"],
+    rust_component = "//tools/file_ops:file_ops",
+    wit_files = ["//tools/file_ops:wit_files"],
 )
 
 # Build tests to verify toolchain configurations

toolchains/BUILD.bazel

@@ -199,7 +199,7 @@ bzl_library(
 file_ops_toolchain(
     name = "file_ops_toolchain_impl",
     file_ops_component = "//tools/file_ops:file_ops",
-    wit_files = ["//tools/file_operations_component:wit_files"],
+    wit_files = ["//tools/file_ops:wit_files"],
 )
 
 toolchain(
@@ -215,7 +215,7 @@ toolchain(
 file_ops_toolchain(
     name = "file_ops_toolchain_external_impl",
     file_ops_component = "//tools/file_ops_external:file_ops_external",
-    wit_files = ["//tools/file_operations_component:wit_files"],
+    wit_files = ["//tools/file_ops:wit_files"],
 )
 
 toolchain(

toolchains/file_ops_toolchain.bzl

@@ -43,7 +43,7 @@ load("@rules_wasm_component//toolchains:file_ops_toolchain.bzl", "file_ops_toolc
 file_ops_toolchain(
     name = "file_ops_toolchain_impl",
     file_ops_component = "@rules_wasm_component//tools/file_ops:file_ops",
-    wit_files = ["@rules_wasm_component//tools/file_operations_component:wit_files"],
+    wit_files = ["@rules_wasm_component//tools/file_ops:wit_files"],
     visibility = ["//visibility:public"],
 )