readme: add "How subscope finds your subreddits" (live discovery v3.2.1)

Documents the discovery upgrade for plain users, framed by the agency
marketing pass (content-marketer + product-strategist):
- live search not a template
- a dated buyer thread (last 7 days) as evidence on every result
- Claude reviews each candidate, drops keyword false positives
  (career questions, self-promo, Clio-the-car / Homebase-the-camera collisions)
- plain-English reason + 0-100 confidence per sub, with a verbatim example card
- "verify it yourself: click the thread" proof-over-claims framing
- honest precision-over-volume note (may surface 1-3 subs or "none this week")

Also refreshed onboarding step 5 to match the new card (confidence + reason +
timestamped link) and link to the new section.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: dancolta

README.md

@@ -85,7 +85,7 @@ Seven turns, plain questions, one confirmation, optional integrations, first sca
 2. **What do you sell?** One line.
 3. **Who buys it?** A job title is enough.
 4. **What is the pain?** A real customer quote is gold. Paraphrase is fine.
-5. **Confirm the scan card.** Five fields merged from your three answers plus the URL fetch: what you sell, buyers, pain pattern, up to 8 candidate subreddits with why-lines like `r/microsaas (4 threads · "saas subscriptions too expensive")`, and up to 6 competitors. The subreddits come from live Reddit search against your pain phrasing plus your competitor brands, not from a generic founder template. If discovery returns thin or noisy results, the flow asks one extra question about your vertical and re-runs. Reply `go` to lock the card, or tell the flow what to fix and it re-renders.
+5. **Confirm the scan card.** What you sell, buyers, pain pattern, your competitor list, and the recommended subreddits. Each subreddit carries a confidence score, a one-line reason it was picked, and a clickable link to a real buyer thread posted in the last 7 days (see ["How subscope finds your subreddits"](#how-subscope-finds-your-subreddits) below). Reply `go` to lock the card, or tell the flow what to fix and it re-renders.
 6. **Connect integrations (optional).** One menu, multi-pick. DataForSEO, Firecrawl, Notion, Slack, Obsidian. Reply `skip` to skip the whole menu, or `skip` inside any sub-prompt to drop just that one. A failed paste re-asks once, then moves on. The scan still runs.
 7. **First scan runs.** If DataForSEO or Firecrawl keys were set up, the engine warms the enrichment cache against your homepage once. Then 5 to 12 threads land in chat with pattern badges, grouped by tier, with a plain-English summary of what was filtered before scoring (subreddit rules, author quality, content rules).
 
@@ -97,6 +97,32 @@ Once your profile is in place, each scan fetches new posts from your configured
 
 ---
 
+## How subscope finds your subreddits
+
+When you onboard, subscope does not hand you a generic list of r/SaaS and r/Entrepreneur. It does not hand you a list of subreddits at all. It hands you a list of people asking for what you sell, with the receipts.
+
+Here is what happens during discovery:
+
+1. **Live search, not a template.** subscope searches Reddit in real time using your own pain phrasing and your competitors' brand names. The subreddits it recommends come from real conversations happening this week, not a founder-archetype lookup. Two people selling different things get different subreddits.
+
+2. **A real buyer thread, dated, on every result.** A subreddit only makes the list if it has a genuine buyer thread from the **last 7 days**. Each recommendation includes a direct link to that exact thread plus an absolute timestamp. A subreddit name is a guess. A live buyer thread is evidence.
+
+3. **Claude reviews every candidate.** A keyword pass finds candidates, then Claude (the AI running the plugin) reads each one and drops the false positives that keyword matching cannot catch: career questions ("Software Engineering vs Dentistry"), self-promoters announcing their own newsletter, and brand-name collisions (the law software "Clio" vs the Renault "Clio", the scheduling app "Homebase" vs the Eufy camera "Homebase"). You only see subreddits with a confirmed buyer.
+
+4. **A plain-English reason + a confidence score.** Each result tells you why it was picked, naming only signals that are actually in the thread, plus a 0-100 confidence so you know which to trust most. A result looks like this:
+
+   ```
+   [64] r/LawFirm   buyer post 2026-05-28 07:29 UTC
+        "Best tool for document parsing?"
+        Buyer post 14h ago. Someone asking about a "tool" with buying intent ("best").
+   ```
+
+**Verify it yourself.** Click the thread link on any recommendation. If it is not a real person shopping for what you sell, the tool failed. That is the bar we hold it to, and you can check it in one click.
+
+**Precision over volume, on purpose.** In a narrow B2B niche you might see one to three subreddits, or occasionally "no active buyer this week." That honest result beats padding the list with noise. subscope never auto-posts and never invents a match. You find the thread, you decide, you write the reply.
+
+---
+
 ## Integrations
 
 subscope slots into the tools you already use.