docs(tbv): hide Technical Details + Safety pages pending Vlad's corrections (#448)

Marks the four Phase-2 TBV pages draft:true so they are excluded from the
production build (404 on the live site), and removes their sidebar entries:

- technical-details/protocol-architecture
- technical-details/protocol-actors
- technical-details/aave-v4-integration
- start-here/safety-and-trust-assumptions

These are held until Vlad provides corrections. Reversible by removing the
draft flag and restoring the sidebar entries. No other pages link to them,
so no broken links; production build passes with onBrokenLinks:'throw'.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: web3jenks

docs/trustless-bitcoin-vault/start-here/safety-and-trust-assumptions.mdx

@@ -1,6 +1,7 @@
 ---
 title: Safety & trust assumptions
 sidebar_position: 4
+draft: true
 ---
 
 # Safety & trust assumptions

docs/trustless-bitcoin-vault/technical-details/aave-v4-integration.mdx

@@ -1,6 +1,7 @@
 ---
 title: Aave v4 integration
 sidebar_position: 3
+draft: true
 ---
 
 # Aave v4 integration

docs/trustless-bitcoin-vault/technical-details/protocol-actors.mdx

@@ -1,6 +1,7 @@
 ---
 title: Protocol actors
 sidebar_position: 2
+draft: true
 ---
 
 # Protocol actors

docs/trustless-bitcoin-vault/technical-details/protocol-architecture.mdx

@@ -1,6 +1,7 @@
 ---
 title: Protocol architecture
 sidebar_position: 1
+draft: true
 ---
 
 # Protocol architecture

sidebars-default.js

@@ -265,7 +265,6 @@ const sidebars = {
         'trustless-bitcoin-vault/start-here/what-is-tbv',
         'trustless-bitcoin-vault/start-here/how-it-works',
         'trustless-bitcoin-vault/start-here/tbv-vs-alternatives',
-        'trustless-bitcoin-vault/start-here/safety-and-trust-assumptions',
       ],
     },
     {
@@ -295,18 +294,6 @@ const sidebars = {
         'trustless-bitcoin-vault/use-for-lending/faq',
       ],
     },
-    {
-      type: 'category',
-      label: 'Technical Details',
-      collapsible: true,
-      collapsed: true,
-      className: 'specs_sidebar_header',
-      items: [
-        'trustless-bitcoin-vault/technical-details/protocol-architecture',
-        'trustless-bitcoin-vault/technical-details/protocol-actors',
-        'trustless-bitcoin-vault/technical-details/aave-v4-integration',
-      ],
-    },
     {
       type: 'category',
       label: 'Research',