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.

action.yml

@@ -25,36 +25,8 @@ inputs:
     default: "claude/"
 
   # Claude Code configuration
-  model:
-    description: "Model to use (provider-specific format required for Bedrock/Vertex)"
-    required: false
-  fallback_model:
-    description: "Enable automatic fallback to specified model when primary model is unavailable"
-    required: false
-  allowed_tools:
-    description: "Additional tools for Claude to use (the base GitHub tools will always be included)"
-    required: false
-    default: ""
-  disallowed_tools:
-    description: "Tools that Claude should never use"
-    required: false
-    default: ""
-  custom_instructions:
-    description: "Additional custom instructions to include in the prompt for Claude"
-    required: false
-    default: ""
   prompt:
-    description: "Instructions for Claude. Can be a direct prompt, slash command (e.g. /review), or custom template."
-    required: false
-    default: ""
-  mcp_config:
-    description: "Additional MCP configuration (JSON string) that merges with the built-in GitHub MCP servers"
-  additional_permissions:
-    description: "Additional permissions to enable. Currently supports 'actions: read' for viewing workflow results"
-    required: false
-    default: ""
-  claude_env:
-    description: "Custom environment variables to pass to Claude Code execution (YAML format)"
+    description: "Instructions for Claude. Can be a direct prompt or custom template."
     required: false
     default: ""
   settings:
@@ -81,10 +53,6 @@ inputs:
     required: false
     default: "false"
 
-  max_turns:
-    description: "Maximum number of conversation turns"
-    required: false
-    default: ""
   timeout_minutes:
     description: "Timeout in minutes for execution"
     required: false
@@ -141,17 +109,10 @@ runs:
         LABEL_TRIGGER: ${{ inputs.label_trigger }}
         BASE_BRANCH: ${{ inputs.base_branch }}
         BRANCH_PREFIX: ${{ inputs.branch_prefix }}
-        ALLOWED_TOOLS: ${{ inputs.allowed_tools }}
-        DISALLOWED_TOOLS: ${{ inputs.disallowed_tools }}
-        CUSTOM_INSTRUCTIONS: ${{ inputs.custom_instructions }}
-        DIRECT_PROMPT: ${{ inputs.direct_prompt }}
-        OVERRIDE_PROMPT: ${{ inputs.override_prompt }}
-        MCP_CONFIG: ${{ inputs.mcp_config }}
         OVERRIDE_GITHUB_TOKEN: ${{ inputs.github_token }}
         GITHUB_RUN_ID: ${{ github.run_id }}
         USE_STICKY_COMMENT: ${{ inputs.use_sticky_comment }}
         DEFAULT_WORKFLOW_TOKEN: ${{ github.token }}
-        ADDITIONAL_PERMISSIONS: ${{ inputs.additional_permissions }}
         USE_COMMIT_SIGNING: ${{ inputs.use_commit_signing }}
 
     - name: Install Base Action Dependencies
@@ -187,21 +148,12 @@ runs:
         # Base-action inputs
         CLAUDE_CODE_ACTION: "1"
         INPUT_PROMPT_FILE: ${{ runner.temp }}/claude-prompts/claude-prompt.txt
-        INPUT_ALLOWED_TOOLS: ${{ env.ALLOWED_TOOLS }}
-        INPUT_DISALLOWED_TOOLS: ${{ env.DISALLOWED_TOOLS }}
-        INPUT_MAX_TURNS: ${{ inputs.max_turns }}
-        INPUT_MCP_CONFIG: ${{ steps.prepare.outputs.mcp_config }}
         INPUT_SETTINGS: ${{ inputs.settings }}
-        INPUT_SYSTEM_PROMPT: ""
-        INPUT_APPEND_SYSTEM_PROMPT: ${{ env.APPEND_SYSTEM_PROMPT }}
         INPUT_TIMEOUT_MINUTES: ${{ inputs.timeout_minutes }}
-        INPUT_CLAUDE_ENV: ${{ inputs.claude_env }}
-        INPUT_FALLBACK_MODEL: ${{ inputs.fallback_model }}
         INPUT_CLAUDE_ARGS: ${{ inputs.claude_args }}
         INPUT_EXPERIMENTAL_SLASH_COMMANDS_DIR: ${{ github.action_path }}/slash-commands
 
         # Model configuration
-        ANTHROPIC_MODEL: ${{ inputs.model || inputs.anthropic_model }}
         GITHUB_TOKEN: ${{ steps.prepare.outputs.GITHUB_TOKEN }}
         NODE_VERSION: ${{ env.NODE_VERSION }}
         DETAILED_PERMISSION_MESSAGES: "1"