docs: raise docstring coverage in main.py from ~43% to 96.5%

[Copilot]

main.py had 40/57 functions documented (70% at best, historically as low as 43%), making the codebase difficult to navigate without reading implementations.

Additions (15 functions, Google-style throughout)

• Public API wrappers — _api_client, _api_get, _api_delete, _api_post, _api_post_form: document thread-safe stats tracking, retry delegation, and error surface
• Core workflow — _process_single_folder, print_summary_table: full Args/Returns/Raises covering multi-branch logic
• Parallelized inner helpers — _fetch_folder_rules, _validate_and_fetch, _fetch_if_valid: explain the cache-first and error-isolation patterns that are non-obvious from the signature alone
• ColoredFormatter — __init__ and format: document the delegate-formatter pattern and why levelname is temporarily mutated then restored
• Table renderers — _print_separator, _print_row, make_col_separator: clarify the chars-key indirection and color-wrapping behaviour

Result

	Before	After
Functions with docstrings	40 / 57	55 / 57
Coverage	~70%	96.5%

The two remaining undocumented functions (line, row) are single-line rendering expressions whose bodies are self-explanatory.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Code Quality] Improve docstring coverage from 43% to 80%</issue_title>
<issue_description>### Description

Current docstring coverage in main.py is only 43-46% (20 out of 46 functions have docstrings). This makes the codebase harder to maintain and understand, especially for new contributors or AI agents working on the code.

Problem

From recent QA reports:

• Discussion Daily QAReport - February 18, 2026 #337: "Docstring coverage: 46.3% (19/41 functions)"
• Discussion Daily QAReport - February 16, 2026 #276: "20/46 functions have docstrings (43%)"

This low coverage creates:

• Difficulty understanding function behavior without reading implementation
• Reduced maintainability for complex functions
• Inconsistent documentation practices

Suggested Changes

1. Add docstrings to ~26 functions lacking them:

   • Focus on public API functions first
   • Then internal/helper functions
   • Use Google or NumPy docstring format consistently

2. Docstring format template (Google style):

   def function_name(param1: str, param2: int) -> bool:
       """Brief one-line description.
       
       More detailed description if needed, explaining the function's
       purpose, behavior, and any important implementation details.
       
       Args:
           param1: Description of param1
           param2: Description of param2
           
       Returns:
           Description of return value
           
       Raises:
           ValueError: When invalid input is provided
           HTTPError: When API request fails
       """

3. Priority order for adding docstrings:

   • Main entry point and CLI functions
   • API interaction functions (_api_get, _api_post, etc.)
   • Validation functions (validate_hostname, etc.)
   • Cache and rate limit handling
   • Helper/utility functions last

Files Affected

• main.py (primary target - ~2,150 lines, 46 functions)

Success Criteria

• ✅ 80%+ of functions have comprehensive docstrings (37+ out of 46)
• ✅ Docstrings follow consistent format (Google or NumPy style)
• ✅ All docstrings include: description, Args, Returns, Raises (where applicable)
• ✅ Complex functions include usage examples in docstrings
• ✅ Public API functions prioritized (100% coverage)

Priority

Medium - Improves long-term maintainability and code understanding

Estimated Effort

1 day (6-8 hours)

Source

Extracted from Daily QA Report abhimehro/ctrld-sync#337 and Daily QA Report abhimehro/ctrld-sync#276

QA Report Findings:

• 2,150+ lines in main.py (46 functions, 2 classes)
• 20/46 functions have docstrings (43%)
• Observation: ~30 functions lack docstrings (46% coverage)

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• expires on Feb 20, 2026, 8:57 PM UTC

Comments on the Issue (you are @copilot in this section)

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• Fixes [Code Quality] Improve docstring coverage from 43% to 80% #386

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[Copilot]

Pull request overview

This pull request significantly improves code documentation in main.py by adding comprehensive Google-style docstrings to 15 previously undocumented functions, raising docstring coverage from approximately 70% (40/57 functions) to 96.5% (55/57 functions).

Changes:

• Added detailed docstrings to 15 core functions including API wrappers, logging formatters, table renderers, and parallelized helper functions
• Updated dependency lock file (uv.lock) to include pytest-benchmark and py-cpuinfo

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
main.py	Added comprehensive Google-style docstrings to 15 functions covering API wrappers (_api_client, _api_get, _api_delete, _api_post, _api_post_form), logging (ColoredFormatter methods), table rendering helpers (_print_separator, _print_row, make_col_separator), and workflow functions (_process_single_folder, _fetch_folder_rules, _validate_and_fetch, _fetch_if_valid, print_summary_table)
uv.lock	Synced lock file to include pytest-benchmark 5.2.3 and its dependency py-cpuinfo 9.0.0

[abhimehro]

🤖 Automated PR Review — Closing due to merge conflict

This PR has a merge conflict with main after merging 11 other PRs. The docstring coverage improvement is valuable — consider re-submitting as a fresh PR against current main.