fix(validation): use runtime config validation entrypoint

[gildesmarais]

Summary

• switch bin/validate_configs to Html2rss::Config.validate_yaml(file)
• cover parameterized config validation at the script level
• load the sibling html2rss checkout in specs so this workspace exercises the shared validation behavior

Why

This script was validating raw YAML directly, which drifted from the runtime parameter-expansion path. Using the gem entrypoint keeps validation behavior aligned with feed execution.

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This pull request makes minor updates to the development environment and test setup, ensuring dependencies are correctly sourced and loaded.

• Dependency management:

  • Updated the Gemfile to use the html2rss-generator gem from the GitHub repository instead of a local path, ensuring consistency with the remote source.

• Test setup:

  • Added an explicit require 'html2rss' statement in spec/spec_helper.rb to ensure the main library is loaded during tests.

[Copilot]

Pull request overview

Updates config validation tooling to use the latest html2rss API and adds a regression test to ensure parameterized configs validate correctly (including defaults).

Changes:

• Switch bin/validate_configs to use Html2rss::Config.validate_yaml with a compatibility guard for older gem versions.
• Add an RSpec integration test for validating a parameterized config with defaults.
• Minor tooling/dependency updates (npm ci in setup, gem revisions/lockfile adjustments).

Reviewed changes

Copilot reviewed 2 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
spec/spec_helper.rb	Minor formatting adjustment.
spec/bin/validate_configs_spec.rb	Adds spec coverage for bin/validate_configs success path with parameter defaults.
bin/validate_configs	Moves validation to Config.validate_yaml and adds version guardrails.
bin/setup	Uses npm ci for deterministic Node installs.
Gemfile	Removes a commented-out local override.
Gemfile.lock	Updates pinned git revision and a dependency patch version.

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