fix(feedback): read the live route's Free/free seat-count keys

GET /webhook/feedback answers {"free":"","Free":9} (200), but the page
only read seats_left/seatsLeft, so the live page rendered state 4 ("We
cannot read the seat count right now."). Add the wire's own names after the
documented ones: leftKeys: [seats_left, seatsLeft, Free, free]. The existing
guard already skips "free": "" and requires a whole number >= 0, so 9 is
used and an empty string alone prints no number. Document the expected GET
reply (free/Free + the optional feedback[] shape and its publish gate) in the
constants comment. No total is returned, so "9 seats left" stays. Four
states, consent gate, claim body, leak rules and copy untouched.

feedback/index.html

@@ -164,8 +164,17 @@
          the feedback form. SHAPES (this is the contract to match in the n8n workflow):
 
          GET  statusUrl            (no query string)
-           -> 200 { "seats_left": 7, "seats_total": 10,
+           -> 200 { "seats_left": 7, "seats_total": 10 }        <- the intended shape
+              or  { "free": 9 }                                 <- what the live route answers today
+              or  { "free": 0,
                     "feedback": [ { "text": "...", "name": "Jane", "publish": "yes" } ] }
+              A count arrives under the documented names first, then the live route's
+              "Free"/"free"; a count must be a whole number >= 0 or it is not on the wire
+              (so "free": "" is skipped and the next key is read). "feedback" (aka "entries")
+              carries the cohort's words: each entry is published only when its "publish" is
+              "yes" (words with the name) or "name" (words without it) — "no", missing or
+              unknown is never rendered. With no seats and no "feedback", the cohort-full
+              state states plainly that nothing is published yet (never a blank list).
 
          POST submitUrl  { "form": "claim", "upwork": "<their Upwork name>" }
            -> 200 { "seats_left": 6, "seats_total": 10, "held_until": "2026-11-03T18:40:00Z" }
@@ -184,7 +193,9 @@
         // The one route that receives a claim and the feedback form.
         submitUrl: "https://n8n.odoo4projects.com/webhook/feedback",
         // GET reply keys, in the order they are read. A key not listed here is never read.
-        leftKeys: ["seats_left", "seatsLeft"],
+        // "Free"/"free" are the live route's names today; they come last so the documented
+        // shape still wins if it ever arrives. "free": "" is skipped by pick() below.
+        leftKeys: ["seats_left", "seatsLeft", "Free", "free"],
         totalKeys: ["seats_total", "seatsTotal"],
         feedbackKeys: ["feedback", "entries"],
         // One feedback entry. A missing "" means "not on the wire", never a value.