docs: news sources research: one publisher, Google News, greencloud test

- Why not a browser per user: a full engine per install and fetch, each
  user facing the challenge, IDX seeing thousands of scrapers; one
  scheduled publisher serving static files instead (diagram). Hosting
  left open (GitHub release, Cloudflare Pages/R2, a Worker).
- The IDX challenge is JavaScript-based: curl fails from a second
  datacenter (greencloud-vps, Singapore) too, so IP is not what curl
  lacks.
- Other sources measured: Google News RSS covers companies MSN misses
  (BREN 75/100 titles naming the ticker in 7 days), plain HTTP; Yahoo
  search answers 429.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V3syn2fN2LNo5pvTSqc6eh

ROADMAP.md

@@ -11,8 +11,9 @@ history lives in git.
 - `screen presets` / `screen run <PRESET>`: built-in screener presets
   (graduate `screen` out of `stocks` only if these grow into a richer workflow)
 - Multi-period financial statements (today `financials` is single-period)
-- IDX company disclosures and exchange news in `news` / `get_company`, through
-  a maintainer-published feed (`docs/IDX_NEWS.md`)
+- News beyond MSN in `news` / `get_company` (`docs/IDX_NEWS.md`): Google News
+  RSS per ticker, and IDX disclosures and exchange news through a
+  maintainer-published feed
 
 ## Workflow
 - `watchlist`: named symbol sets usable by other commands