fix: critical parity bugs - enable tools, default permissions, tool input

Tighten prompt-mode parity for the Rust CLI by enabling native tools in one-shot runs, defaulting fresh sessions to danger-full-access, and documenting the remaining TS-vs-Rust gaps.

The JSON prompt path now runs through the full conversation loop so tool use and tool results are preserved without streaming terminal noise, while the tool-input accumulator keeps the streaming {} placeholder fix without corrupting legitimate non-stream empty objects.

Constraint: Original TypeScript source was treated as read-only for parity analysis
Constraint: No new dependencies; keep the fix localized to the Rust port
Rejected: Leave JSON prompt mode on a direct non-tool API path | preserved the one-shot parity bug
Rejected: Keep workspace-write as the default permission mode | contradicted requested parity target
Confidence: high
Scope-risk: moderate
Reversibility: clean
Directive: Keep prompt text and prompt JSON paths on the same tool-capable runtime semantics unless upstream behavior proves they must diverge
Tested: cargo build --release; cargo test
Not-tested: live remote prompt run against LayoffLabs endpoint in this session

rust/crates/rusty-claude-cli/src/init.rs

@@ -4,7 +4,7 @@ use std::path::{Path, PathBuf};
 const STARTER_CLAUDE_JSON: &str = concat!(
     "{\n",
     "  \"permissions\": {\n",
-    "    \"defaultMode\": \"acceptEdits\"\n",
+    "    \"defaultMode\": \"dontAsk\"\n",
     "  }\n",
     "}\n",
 );
@@ -366,7 +366,7 @@ mod tests {
             concat!(
                 "{\n",
                 "  \"permissions\": {\n",
-                "    \"defaultMode\": \"acceptEdits\"\n",
+                "    \"defaultMode\": \"dontAsk\"\n",
                 "  }\n",
                 "}\n",
             )