Restore lang_tags, lang_collectors, lang_run_stages from Puppet 5.4 archive

[miharp]

Scope

Restores the final three stub pages in docs/_openvox_8x/ from the
puppetlabs/docs-archive (puppet/5.4).

Changes

lang_tags.markdown — full content restored covering:

• Automatic tagging (resource type, class name, namespace segments)
• Containment propagation
• tag metaparameter and tag function
• Using tags: collecting resources, restricting catalog runs, reading tags in report handlers

lang_collectors.markdown — full content restored covering:

• Syntax and search expressions (==, !=, and, or)
• Location/usage rules (valid and invalid contexts)
• Behavior (virtual resource realization, chaining, attribute overrides)
• Exported resource collectors (<<| |>> syntax and behavior)

lang_run_stages.markdown — full content restored covering:

• Default main stage
• Declaring custom stages with ordering relationships
• Assigning classes to stages via the stage metaparameter
• Limitations (resource-like declaration required, no cross-stage notifications, containment caveats)

Adaptations from archive source:

• Prose Puppet → OpenVox where describing runtime behavior
• Removed Kramdown class tags ({:.concept}, {:.task}, {:.section})
• Removed PE-specific PuppetDB install/connect links
• Removed unused link definitions (MD053)
• Renamed duplicate sub-headings to avoid MD024
• Lines wrapped to 210 chars (MD013)

Test plan

• bundle exec jekyll build succeeds with no errors
• markdownlint-cli2 reports 0 errors against the project's planned 210-char config
  (see #30)

🤖 Generated with Claude Code