feat: add flexible bot access control with allowed_bots option (#117)

* feat: skip permission check for GitHub App bot users

GitHub Apps (users ending with [bot]) now bypass permission checks
as they have their own authorization mechanism.

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Co-Authored-By: Claude <noreply@anthropic.com>

* feat: add allow_bot_users option to control bot user access

- Add allow_bot_users input parameter (default: false)
- Modify checkHumanActor to optionally allow bot users
- Add comprehensive tests for bot user handling
- Improve security by blocking bot users by default

This change prevents potential prompt injection attacks from bot users
while providing flexibility for trusted bot integrations.

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Co-Authored-By: Claude <noreply@anthropic.com>

* docs: mark bot user support feature as completed in roadmap

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Co-Authored-By: Claude <noreply@anthropic.com>

* refactor: move allowedBots parameter to context object

Move allowedBots from function parameter to context.inputs to maintain
consistency with other input handling throughout the codebase.

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Co-Authored-By: Claude <noreply@anthropic.com>

* docs: update README for bot user support feature

Add documentation for the new allowed_bots parameter that enables
bot users to trigger Claude actions with granular control.

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Co-Authored-By: Claude <noreply@anthropic.com>

* fix: add missing allowedBots property in permissions test

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Co-Authored-By: Claude <noreply@anthropic.com>

* fix: update bot name format to include [bot] suffix in tests and docs

- Update test cases to use correct bot actor names with [bot] suffix
- Update documentation example to show correct bot name format
- Align with GitHub's actual bot naming convention

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Co-Authored-By: Claude <noreply@anthropic.com>

* feat: normalize bot names for allowed_bots validation

- Strip [bot] suffix from both actor names and allowed bot list for comparison
- Allow both "dependabot" and "dependabot[bot]" formats in allowed_bots input
- Display normalized bot names in error messages for consistency
- Add comprehensive test coverage for both naming formats

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Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

ROADMAP.md

@@ -10,7 +10,7 @@ Thank you for trying out the beta of our GitHub Action! This document outlines o
 - **Support for workflow_dispatch and repository_dispatch events** - Dispatch Claude on events triggered via API from other workflows or from other services
 - **Ability to disable commit signing** - Option to turn off GPG signing for environments where it's not required. This will enable Claude to use normal `git` bash commands for committing. This will likely become the default behavior once added.
 - **Better code review behavior** - Support inline comments on specific lines, provide higher quality reviews with more actionable feedback
-- **Support triggering @claude from bot users** - Allow automation and bot accounts to invoke Claude
+- ~**Support triggering @claude from bot users** - Allow automation and bot accounts to invoke Claude~
 - **Customizable base prompts** - Full control over Claude's initial context with template variables like `$PR_COMMENTS`, `$PR_FILES`, etc. Users can replace our default prompt entirely while still accessing key contextual data
 
 ---