refactor: complete v1.0 simplification by removing all legacy inputs

- Remove all backward compatibility for v1.0 simplification
- Remove 10 legacy inputs from base-action/action.yml
- Remove 9 legacy inputs from main action.yml
- Simplify ClaudeOptions type to just timeoutMinutes and claudeArgs
- Remove all legacy option handling from prepareRunConfig
- Update tests to remove references to deleted fields
- Remove obsolete test file github/context.test.ts
- Clean up types to remove customInstructions, allowedTools, disallowedTools

Users now use claudeArgs exclusively for CLI control.

src/modes/agent/index.ts

@@ -58,21 +58,8 @@ export const agentMode: Mode = {
       promptContent,
     );
 
-    // Agent mode: User has full control via claudeArgs or legacy inputs
+    // Agent mode: User has full control via claudeArgs
     // No default tools are enforced - Claude Code's defaults will apply
-    // Export user-specified tools only if provided
-    if (context.inputs.allowedTools.length > 0) {
-      core.exportVariable(
-        "INPUT_ALLOWED_TOOLS",
-        context.inputs.allowedTools.join(","),
-      );
-    }
-    if (context.inputs.disallowedTools.length > 0) {
-      core.exportVariable(
-        "INPUT_DISALLOWED_TOOLS",
-        context.inputs.disallowedTools.join(","),
-      );
-    }
 
     // Agent mode uses a minimal MCP configuration
     // We don't need comment servers or PR-specific tools for automation

src/modes/tag/index.ts

@@ -110,7 +110,7 @@ export const tagMode: Mode = {
       baseBranch: branchInfo.baseBranch,
       additionalMcpConfig,
       claudeCommentId: commentId.toString(),
-      allowedTools: context.inputs.allowedTools,
+      allowedTools: [],
       context,
     });