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.

test/permissions.test.ts

@@ -64,12 +64,8 @@ describe("checkWritePermissions", () => {
       triggerPhrase: "@claude",
       assigneeTrigger: "",
       labelTrigger: "",
-      allowedTools: [],
-      disallowedTools: [],
-      customInstructions: "",
       branchPrefix: "claude/",
       useStickyComment: false,
-      additionalPermissions: new Map(),
       useCommitSigning: false,
     },
   });