Add telegram-ads-analyst subagent to Business & Product

[Courier-Britva]

Adds telegram-ads-analyst to 08-business-product: a media buyer for Telegram channels, next to content-marketer, growth-loops and landing-page-copywriter.

Buying posts in Telegram channels doesn't fit the existing marketing agents: there is no likes-based engagement rate, no ranking feed, and subscriber counts are easy to inflate. The agent collects a channel's real post views, compares reach with benchmarks by size, topic and language, flags inactive channels, heavy ad load, ad networks and renamed channels, prices the post per view with deletion-window discounts, and returns a buy / negotiate / skip call per channel. Every benchmark is sourced; no invented metrics.

Updated as the contributing guide requires:

• categories/08-business-product/telegram-ads-analyst.md (new agent)
• main README.md, alphabetical within Business & Product
• categories/08-business-product/README.md: description and Quick Selection Guide row
• voltagent-biz version 1.0.4 → 1.0.5 in the category plugin.json (agent added to the list) and in .claude-plugin/marketplace.json

Disclosure: I run TGScope, which published the studies the benchmarks come from. Its free tools appear once, as the last of five vetting options, and every step works with the manual check alone.

[necatiozmen]

Thanks for the thorough write-up and the honest disclosure. I pushed one commit to your branch: removed the TGScope tool links from Vetting Options so the file links a vendor only in the Sources section (the three research links and the disclosure stay). The manual check already covers that step. Merging.