Add chokidar-as-cli example and implement Lua library functions

[gesslar]

Summary

Adds a curated set of 4 representative source files per parser type as test fixtures for validating the Lua and C parsers:

• examples/source/lua/ — string.lua, date.lua, table.lua, func.lua (updated from meta definitions to implementations)
• examples/source/lua-library-source/ — same 4 files as reference library variants (new meta definitions)
• examples/chokidar-as-cli/src/ — string.c, function.c, data.c, numbers.c (new C function declarations)
• examples/source/lpc/data.c — minor annotation update adding @return {void} to data_write

The same 4 filenames are used across the Lua directories to ensure reproducibility when testing the same parser logic under different source contexts (standalone vs. library source). Files were chosen to cover a range of documentation patterns: simple utilities, date/time functions with rich annotations, collection utilities, and functional patterns.

Test plan

• Run BeDoc against examples/source/lua/ and verify Lua parser produces output
• Run BeDoc against examples/source/lua-library-source/ and confirm same parser logic applies
• Run BeDoc against examples/chokidar-as-cli/src/ and verify C parser produces output

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[gesslar]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• chore: trim example source files to minimal set #491
• Add chokidar-as-cli example and implement Lua library functions #490 👈 (View in Graphite)
• Add chokidar examples, update hooks API, refactor parsers/formatters, and enhance configuration #489
• Major dependency overhaul and project restructure #488
• Remove TypeScript definitions and core implementation files #487
• Add BeDoc core implementation with action discovery and processing pipeline #486
• Update VS Code configs, add Unlicense, and refactor ESLint to use @gesslar/uglier #485
• Replace custom workflows with reusable Quality and Release workflows #484
• main

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