docs: replace terminal output with real heatmap screenshots in cron-scheduler.md

Swapped the curl/jq text block for what the doc actually needed:
real screenshots of the live Dashy Fleet Schedule Heatmap widget -
one showing a populated cell clicked open (proving the TIP's
click-to-expand claim is real, not just described), one showing the
"no fixed time" section for the 15 jobs excluded from the grid.

docs/cron-scheduler.md

@@ -7,21 +7,17 @@
 
 A Node-RED tab fetches the inventory straight from NocoDB's REST API at request time — no cache — and renders it as a 7×24 grid (Mon–Sun × 00:00–23:00). Each cell's color is a **computed load weight**, not a raw job count: base `1` per job, plus a duration-bucket weight, plus a resource-tag weight (`disk-intensive`=2, `cpu-intensive`=1.5, `network-intensive`=0.5, summed if a job carries more than one), plus a flat `+1` if the job's category is `backup` — disk I/O contention from an overlapping backup is judged a worse collision than two lightweight jobs sharing an hour, and the weight formula says so explicitly rather than pretending every job costs the same. Weights bucket into 4 color bands (green → yellow → orange → red) relative to the current busiest cell. Jobs whose time can't be resolved to a specific day+hour are excluded from the grid and listed separately rather than forced into a misleading cell.
 
-This is the real table, not a description of it:
+This is the real heatmap, not a description of it — 50 known jobs, 15 without a fixed time:
 
-```
-$ curl -s -H "xc-token: [REDACTED]" \
-  "https://nocodb.[internal zone]/api/v2/tables/[table-id]/records?limit=100" | jq '.list | length'
-50
-$ ... | jq '.list | group_by(.Category) | map({category: .[0].Category, count: length})'
-[{"category":"backup","count":6},{"category":"maintenance","count":23},
- {"category":"media","count":11},{"category":"monitoring","count":5},
- {"category":"security","count":5}]
-```
+![The real Fleet Schedule Heatmap widget in Dashy, with Tue 00:00 clicked open showing its 8 real jobs — name, host, category, and FIXED/APP UI badges for jobs that can't simply be rescheduled](../assets/cron-scheduler-heatmap.png)
 
 > [!TIP]
 > Clicking a populated cell expands the full job list for that slot — name, host, category, and whether that job's schedule can actually be moved or is fixed by whatever app owns it. That last distinction matters in practice: there's no point suggesting a new job avoid a time slot occupied by something that can't be rescheduled anyway versus one that easily could be.
 
+Jobs with no fixed time get their own list instead of a misleading grid cell:
+
+![The heatmap's "no fixed time" section expanded — 15 real jobs excluded from the grid, including the manually-triggered-only Kestra flows and the PBS prune job with its mismatched datastore name](../assets/cron-scheduler-no-fixed-time.png)
+
 ## Why a manual inventory instead of an auto-discovered one
 
 The harder, more "correct" version of this tool would auto-discover every scheduled job by querying Kestra's API, parsing every host's crontab and systemd timers, and re-syncing continuously. That was scoped down deliberately: auto-discovery across three genuinely different scheduling mechanisms (Kestra's API, systemd's timer units, cron's own format) is real engineering effort for a tool whose entire job is picking a good time slot for the next new job — a task that happens occasionally, not continuously. A manually-maintained table, kept honest by being checked at the one moment it actually matters (adding a new job), was judged the better return on effort than building and maintaining three different scanners for a problem that doesn't need real-time accuracy.