chore: gardener housekeeping 2026-04-05

AGENTS.md watermarks refreshed to HEAD (62ba6f2).

Content updates:
- root AGENTS.md: added Docker/LXD notes (apparmor=unconfined, umami port 3001),
  viem v2 slot0 array pattern to Key Patterns
- services/ponder/AGENTS.md: documented LM_ADDRESS, POOL_ADDRESS, and
  MINIMUM_BLOCKS_FOR_RINGBUFFER env vars; added zero-stats troubleshooting note
- web-app/AGENTS.md: added viem v2 slot0 array compat section

Grooming: no open issues.

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

gardener/pending-actions.json

@@ -1,22 +1 @@
-[
-  {
-    "action": "comment",
-    "issue": 1179,
-    "body": "Closing: action complete. Post-fix user-test run (`evidence/user-test/2026-03-27-post-stake-fix.json`) verified the /stakestake navigation bug (PR #1171) is fixed — all 3 personas that reached /stake navigated correctly with no invalid route. The prediction concern is resolved. New ponder 504 issue and chain-revert state corruption were discovered as separate items."
-  },
-  {
-    "action": "close",
-    "issue": 1179,
-    "reason": "actioned and verified — /stakestake fix confirmed working in post-fix user-test 2026-03-27"
-  },
-  {
-    "action": "comment",
-    "issue": 1177,
-    "body": "Closing: action complete. A fresh red-team session was run on 2026-03-27 (`evidence/red-team/2026-03-27.json`): 7 real attacks with full per-attack data, floor_held: true, verdict: floor_held. The ghost run concern is addressed — the new run provides the real evidence the 2026-03-26 ghost run lacked."
-  },
-  {
-    "action": "close",
-    "issue": 1177,
-    "reason": "actioned and verified — fresh red-team run 2026-03-27 completed with 7 real attacks"
-  }
-]
+[]