docs(review): apply batch-04 consultant fixes and approve 5 tutorial/web3 posts

- performUpkeep: external callable, re-check is mandatory security (not stale-data hygiene)
- BasicNft.tokenURI: ownerOf -> _ownerOf, dead custom error explained
- storage (SSTORE) vs EIP-170 runtime bytecode separated, derived ~1.3M gas for the two SVGs
- subs-15 retimed from a fresh faster-whisper word alignment (10.84s first line, was 28.22s) + SRT regenerated
- RDAP needs curl -L (bootstrap 302), ASN/Spamhaus blocklist check added
- learning-project framing -> Sepolia reference implementation / testnet validation build
- dynamicCta on the two posts that ended with no conversion block
- cross-links between the two NFT posts; tracker 91/91 approved

public/subs/green-train-to-the-sea.srt

@@ -1,67 +1,67 @@
 1
-00:00:28,220 --> 00:00:29,980
+00:00:10,840 --> 00:00:14,280
 Clickety-clack upon the track, the green train starts to roll
 
 2
-00:00:29,420 --> 00:00:30,620
+00:00:14,280 --> 00:00:19,420
 Leaving all the city gray behind the tunnel hole
 
 3
-00:00:30,620 --> 00:00:31,820
+00:00:19,420 --> 00:00:24,200
 Forehead pressed against the glass, I watch the fields go by
 
 4
-00:00:31,820 --> 00:00:33,020
+00:00:24,200 --> 00:00:28,380
 Golden wheat and windmills waving underneath the sky
 
 5
-00:00:33,020 --> 00:00:34,220
+00:00:28,380 --> 00:00:33,780
 Take me where the spring wind blows across the open blue
 
 6
-00:00:34,220 --> 00:00:38,359
+00:00:33,780 --> 00:00:38,820
 Ten miles of wildflowers blooming just for me and you
 
 7
-00:00:38,359 --> 00:00:42,679
+00:00:38,820 --> 00:00:43,460
 Every station has a name I've never heard before
 
 8
-00:00:42,679 --> 00:00:47,600
+00:00:43,460 --> 00:00:57,420
 Soon the scent of salty air will meet us at the shore
 
 9
-00:00:57,620 --> 00:01:01,479
+00:00:57,420 --> 00:01:02,460
 Strangers sharing oranges and stories in the seat
 
 10
-00:01:01,920 --> 00:01:06,680
+00:01:02,460 --> 00:01:07,480
 Sunlight dancing in the aisle around my dangling feet
 
 11
-00:01:06,680 --> 00:01:11,500
+00:01:07,480 --> 00:01:11,500
 Postcards in my backpack waiting for a stamp and pen
 
 12
-00:01:11,500 --> 00:01:16,239
+00:01:11,500 --> 00:01:16,220
 To tell the people back at home I'm coming back again
 
 13
-00:01:16,239 --> 00:01:21,140
+00:01:16,220 --> 00:01:21,520
 Take me where the spring wind blows across the open blue
 
 14
-00:01:21,140 --> 00:01:26,340
+00:01:21,520 --> 00:01:26,800
 Ten miles of wildflowers blooming just for me and you
 
 15
-00:01:26,340 --> 00:01:30,659
+00:01:26,800 --> 00:01:31,400
 Every station has a name I've never heard before
 
 16
-00:01:30,659 --> 00:01:35,599
+00:01:31,400 --> 00:01:46,200
 Soon the scent of salty air will meet us at the shore
 
 17
-00:01:46,820 --> 00:01:48,359
+00:01:46,200 --> 00:01:48,840
 Look, there is the sea...