Consolidate the design layer: one place per topic

Jochen: a jungle of specs that slightly contradict or patch each other, and
what matters is a working state rather than history. Both are fair and both are
mine.

Measured rather than assumed. 05-the-node-host and 09-the-node-lifecycle both
covered enrolment, the install commands, the unit file, the launcher and
reconcile -- I wrote 09 without taking anything out of 05, so the same things
were said twice and could drift apart.

Split by what each document IS. 05 is the component: what the host is, its
parts, the declaration vocabulary, the build order, how it is verified. 09 is
what happens to it: install, enrol, run, upgrade, retire. The whole "The
process" section left 05, and the unit file moved to 09 where installing is
described. 05 goes from 338 lines to 245 and now points at 09 rather than
restating it.

09 also carried a 105-line "Resolved" section -- six mechanisms framed as
"these were open and here is the answer". The content is needed; the framing is
history, and history is what makes a document read as a changelog rather than a
description. Renamed to what it actually is and the was-open phrasing removed.

Also added 10-delivery.md, which did not exist: four accepted decisions --
0054, 0063, 0064, 0065 -- had no design document at all, which is the specific
reason the delivery picture felt scattered. It is now one document covering
modules, the three edges, the core library, and how a change becomes a running
thing, with a table of what each property is designed against and what must
exist before it can be built.

02-DECISIONS/0063-delivery-is-reconciliation-not-a-pipeline.md

@@ -1,5 +1,5 @@
 ---
-status: proposed
+status: accepted
 date: 2026-08-28
 deciders: jochen
 reconstructed: false

02-DECISIONS/0064-a-build-edge-is-a-third-kind.md

@@ -1,5 +1,5 @@
 ---
-status: proposed
+status: accepted
 date: 2026-08-28
 deciders: jochen
 reconstructed: false

02-DECISIONS/0065-the-core-library-is-the-meshs-domain.md

@@ -1,5 +1,5 @@
 ---
-status: proposed
+status: accepted
 date: 2026-08-28
 deciders: jochen
 reconstructed: false