fix: replace startup sleep with readiness check, clean up stale env/config

- start.example.sh: replace fixed sleep 30 with /status poll loop (up to 2min)
  so the webmention poller waits exactly until indiekit is ready, not longer
- indiekit.config.mjs: remove redundant webmentionIoMountPath variable and
  mountPath from webmention-io config (package default /webmentions is correct)
- .env.example: remove all stale proxy and unused WEBMENTION_SENDER_* vars
  (HOST, PORT, ENDPOINT, READY_TIMEOUT, STOP_TIMEOUT, AUTO_POLL) that were
  never read by start.example.sh; keep only WEBMENTION_SENDER_POLL_INTERVAL

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.env.example

@@ -10,53 +10,12 @@ PODROLL_EPISODES_URL=
 # Example: https://freshrss.example/api/query.php?user=USER&t=TOKEN&f=opml
 PODROLL_OPML_URL=
 
-# Optional webmention sender endpoint settings
-# Default mount path in indiekit.config.mjs is /webmention-sender
-WEBMENTION_SENDER_MOUNT_PATH=/webmention-sender
-
-# Endpoint discovery timeout (milliseconds)
-WEBMENTION_SENDER_TIMEOUT=10000
-
-# User-Agent used for target endpoint discovery and sends
-WEBMENTION_SENDER_USER_AGENT=
-
-# Enable start script auto-send polling loop (1=enabled, 0=disabled)
-WEBMENTION_SENDER_AUTO_POLL=1
-
-# Polling interval in seconds
-WEBMENTION_SENDER_POLL_INTERVAL=300
-
-# Internal host/port used by polling loop
-# Defaults in start script: host=127.0.0.1, port=$PORT (or 3000)
-WEBMENTION_SENDER_HOST="https://blog.giersig.eu"
-WEBMENTION_SENDER_PORT=3000
-
-# Optional override for JWT me claim (defaults: PUBLICATION_URL -> SITE_URL)
-WEBMENTION_SENDER_ORIGIN=
-
-# Optional full endpoint override (instead of host/port/mount path)
-# Example: http://127.0.0.1:3000/webmention-sender
-WEBMENTION_SENDER_ENDPOINT=
-
-# Wait up to this many seconds for endpoint readiness before first poll
-WEBMENTION_SENDER_READY_TIMEOUT=60
-
-# Graceful stop timeout for webmention poller during shutdown (seconds)
-WEBMENTION_SENDER_STOP_TIMEOUT=5
-
 # Graceful stop timeout for Indiekit process during shutdown (seconds)
 INDIEKIT_STOP_TIMEOUT=20
 
 # If parent process is FreeBSD daemon(8), terminate it during shutdown (1/0)
 KILL_DAEMON_PARENT_ON_SHUTDOWN=1
 
-# Optional webmentions proxy endpoint settings
-# Default mount path in indiekit.config.mjs is /webmentions-api
-WEBMENTIONS_PROXY_MOUNT_PATH=/webmentions-api
-
-# Cache TTL in seconds for proxied webmention.io API responses
-WEBMENTIONS_PROXY_CACHE_TTL=60
-
 # Optional listening endpoint update cadence (milliseconds)
 # Lower values increase freshness but add upstream API load.
 LISTENING_CACHE_TTL=120000
@@ -82,3 +41,6 @@ BLUESKY_PASSWORD=
 MASTODON_URL=
 MASTODON_USER=
 MASTODON_ACCESS_TOKEN=
+
+# Poll interval for webmention-sender (seconds). Long enough for deploys to complete.
+WEBMENTION_SENDER_POLL_INTERVAL=600