feat: convert command + packge updates

[jpvajda]

Note

Medium Risk
Adds new file-conversion and file-deletion flows and upgrades core dependencies (OpenAI SDK/Vitest), which could affect CLI behavior and error handling across environments.

Overview
Adds a new downfolio convert CLI command to convert a selected/generated .md file into docx and/or pdf, with interactive file/format selection, overwrite confirmation, and configurable output directory/name.

Updates Pandoc conversion to use markdown+smart and --standalone, improves PDF conversion reliability by augmenting PATH with macOS TeX bin when present and emitting more actionable error messages.

Upgrades dependencies (notably openai to v6 and vitest to v4), updates AI integration to use OpenAI SDK v6 error classes plus strips accidental triple-backtick wrappers from both OpenAI/Anthropic outputs, and makes config permission-setting failures non-fatal.

Refines job remove/template remove to optionally delete the underlying markdown file after removing it from the registry, and adds CI unit-test workflow plus expanded/updated unit tests and moved manual TEST_PLAN into tests/.

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