niri: drop untracked noctalia.kdl include; sync memory skills

- remove 'include noctalia.kdl' from shared config.kdl: the file is a
  per-host noctalia template render (colors from local palette), was
  never committed, and made every config load fail hard on hosts where
  it was absent — niri 26.04 falls back to DEFAULT config on parse
  error, silently killing keybinds/rules/layout/autostart
- theme integration now only via keybinds (noctalia msg verbs) + the
  host-local rendered files (see managed skill noctalia-template-offline-render)
- sync agent memories: delete retired memory-store skills, add new ones

agent/memories/--home-dank-.omp--/skills/model_config_sync/examples/context_update_example.md

@@ -0,0 +1,5 @@
+When updating context from 160k to 200k:
+1. Convert to Ki: 200 × 1024 = 204800
+2. Update `contextWindow` and `maxTokens` in both `~/.pi/agent/models.json` and `~/.omp/agent/models.yml`
+3. No cache flush required; applies on next config read.
+4. Validate with validation script.