fix(ci): merge duplicate [config] table in .pr_agent.toml

[InfinityZero3000]

Summary

• PR-Agent's GitHub Action fetches .pr_agent.toml from the repo's default branch (main), independent of which branch the PR itself is on. A previous fix for the duplicate [config] table (merged in Onboarding personalization, chat cold-start fix, Lexi chat UX, and backend hardening #392) only landed on dev, so main kept the broken file and every PR since has failed config parsing with Cannot declare ('config',) twice.
• This merges the trailing [config] block's git_provider/pr_commands keys into the top-level [config] table and removes the duplicate header.
• Validated with python3 -c "import tomllib; tomllib.load(open('.pr_agent.toml','rb'))" — parses cleanly, single config section with model, fallback_models, git_provider, pr_commands.

Test plan

• tomllib.load() parses the file without error
• No functional change to any app code — CI-config-only fix

🤖 Generated with Claude Code

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
lexilingo-admin	Ignored		Aug 7, 2026 12:39pm
lexilingo-app	Ignored		Aug 7, 2026 12:39pm

[github-actions]

❌ PR-Agent failed to apply 'local' repo settings

The configuration file needs to be a valid TOML, please fix it.

---

Error message:
Cannot declare ('config',) twice (at line 61, column 8)

Configuration content:

[config]
# Use Google Gemini API
model = "google/gemini-2.5-pro"
fallback_models = ["google/gemini-2.5-flash"]

[pr_reviewer]
# Enable/disable features
require_focused_review = true
require_score_review = true
require_tests_review = true
require_security_review = true
require_estimate_effort_to_review = true

# Review settings
num_code_suggestions = 5
inline_code_comments = true
auto_review = true
remove_previous_review_comment = true

# Language and tone
extra_instructions = """
- Focus on code quality, security, and best practices
- Check for proper error handling
- Verify Clean Architecture principles
- Ensure proper test coverage
- Review API design and RESTful conventions
- Check for potential performance issues
- Verify proper logging and monitoring
"""

[pr_code_suggestions]
# Code improvement suggestions
num_code_suggestions = 5
extra_instructions = """
- Suggest improvements for code readability
- Recommend better naming conventions
- Propose performance optimizations
- Suggest security enhancements
"""

[pr_description]
# Auto-generate PR description
publish_description = true
add_original_user_description = true
extra_instructions = """
- Summarize main changes
- List affected components
- Note breaking changes
- Include testing notes
"""

[pr_questions]
# Auto-generate clarifying questions
num_questions = 3
extra_instructions = """
- Ask about design decisions
- Question potential edge cases
- Clarify implementation choices
"""

[config]
# Model configuration (uncomment to customize)
# model = "gpt-4-turbo-preview"
# model = "anthropic/claude-3-5-sonnet-20241022"
# fallback_models = ["gpt-3.5-turbo"]

# Git provider
git_provider = "github"

# Review triggers
pr_commands = [
    "/review",
    "/describe",
    "/improve",
    "/ask",
    "/update_changelog",
]