refactor: standup generation with persistent work journal and auto-snapshots

[hempun10]

Description

• Added persistent work journal system with auto-snapshots for context recovery (src/core/work-journal.ts, src/core/auto-snapshot.ts)
• Enhanced standup context builder with rich factual signals and smart work context extraction (src/core/standup-context.ts)
• Implemented comprehensive output formatting system with markdown, clipboard, and stats support (src/utils/formatter.ts)
• Added devdaily connect command for PM tool integration testing (src/commands/recall.ts, src/commands/snapshot.ts)
• Established community guidelines and contribution framework (CONTRIBUTING.md, CODE_OF_CONDUCT.md, SECURITY.md)
• Improved git commit parsing to handle multiline commit bodies and enhanced PR template parsing
Closes #2
Closes #1

Motivation

Closes ### Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Refactoring (no functional changes)
• Tests (adding or updating tests)
• CI/Build (changes to build process or CI configuration)

How Has This Been Tested?

1. Run npm test to verify all new test suites pass (auto-snapshot.test.ts, work-journal.test.ts, standup-context.test.ts, pr-creation.test.ts)
2. Test the enhanced standup command with devdaily standup to verify rich context extraction and formatting
3. Test the new snapshot/recall commands with devdaily snapshot and devdaily recall to verify persistent journaling functionality
4. Verify PM tool integration with devdaily connect command for testing purposes

Checklist

• My code follows the contributing guidelines
• I have performed a self-review of my own code
• I have added tests that prove my fix is effective or my feature works
• New and existing tests pass locally with my changes
• I have updated documentation if needed (README, help text, JSDoc)
• My commits follow the conventional commit format