docs: audit links, glossary T0-T4, readability pass

Extend glossary with storage floors, source of truth, and linkable anchors.
Fix broken links, pose frame drift, rsync/offload wording, and README tone.
Add docs/improvement audit records and live demo links in design journey.

docs/07-observability.md

@@ -29,7 +29,7 @@ graph LR
         LG["structured logs<br/>= Parquet partitions"]
     end
     subgraph ground [Ground k3s]
-        DWH["T3 warehouse"]
+        DWH["[T3](00-glossary.md#t3--warehouse) warehouse"]
         PR["Prometheus<br/>(live: docks, CI, sim farm)"]
         LK["Loki<br/>(live logs, dev plane)"]
         GF["Grafana<br/>dashboards + replay"]
@@ -44,7 +44,7 @@ graph LR
 ```
 
 - **Prometheus/Grafana/Loki** cover everything that is alive on the ground: docks, registry, CI runners, warehouse, simulation farm — plus drones on the bench through the dev plane.
-- **Flight post-mortems query the warehouse directly** with DuckDB: staleness budgets vs actuals, link quality vs distance (RSSI), sealing backlog vs ingest rate — per flight, per drone, per minute.
+- **Flight post-mortems query the [source of truth](00-glossary.md#source-of-truth) warehouse directly** with DuckDB: staleness budgets vs actuals, link quality vs distance (RSSI), sealing backlog vs ingest rate — per flight, per drone, per minute.
 
 ## Health questions this design answers cheaply