chore: consolidate documentation — delete status/fix/progress cruft

Before: 335 tracked .md files; top level had 14 README-like docs;
docs/ contained ~234 files, most of them auto/LLM-generated status
reports (ALL_*_COMPLETE*, *_FIX*, DEPLOYMENT_*_FINAL*, etc.).

After: 132 tracked .md files. Repo now has exactly five top-level
docs: README.md, QUICKSTART.md, RUNBOOK.md, CONTRIBUTING.md,
CHANGELOG.md (moved up from docs/).

Keeper philosophy in docs/:
- API, CCIP (ops + security + receiver/router refs), Chainlist refs,
  compliance, deployment (guides not status), database connection,
  legal compliance, metamask integration, production checklist,
  tiered-architecture implementation/setup, reusable-components plan,
  token-mechanism doc, wrap-and-bridge operational reference, plus
  docs/specs/** and docs/api/ / docs/openapi/ trees.

Deleted (git history preserves provenance):
- All 'ALL_*_COMPLETE*' / '*_FIX*' / '*_FIXED*' / '*_FINAL*' /
  '*_STATUS*' / '*_PROGRESS*' / '*_SUMMARY*' files.
- BLOCKSCOUT_*_FIX / _CRASH / _INITIALIZATION / _SCHEMA / _YAML /
  _SKIP / _NEXT_STEPS / _START_AND_BUILD / _DATABASE_CREDENTIALS
  (the last contained passwords).
- CCIP_IMPLEMENTATION_* / CCIP_CURRENT_STATUS / CCIP_GAP_*
  (gap analyses are not a sustained reference).
- NPMPLUS_CREDENTIALS_GUIDE.md (contained creds).
- LETSENCRYPT_CONFIGURATION_GUIDE.md (contained creds; will be
  re-introduced as runbook content post-secrets-scrub).
- docs/diagnostic-reports/, docs/feature-flags/ (run-time artifacts).

README.md: dead links (START_HERE, README_DEPLOYMENT, COMPLETE_DEPLOYMENT,
DEPLOYMENT_COMPLETE_FINAL) replaced with links to the five canonical
top-level docs + docs/ index.

docs/FRONTEND_FIXES_COMPLETE.md

@@ -1,146 +0,0 @@
-# Frontend Errors - Complete Fix Summary
-
-> Historical note: this fix summary was written against the older static-SPA
-> frontend. The canonical live frontend is now the Next standalone app on VMID
-> 5000, while `frontend/public/index.html` remains a compatibility/reference
-> asset.
-
-**Date**: $(date)  
-**Status**: ✅ **ALL FIXES APPLIED**
-
----
-
-## Issues Fixed
-
-### 1. Ethers Library Loading Race Condition ✅
-
-**Problem**: `ethers is not defined` error at line 779 because `checkMetaMaskConnection()` was called before ethers finished loading.
-
-**Root Cause**: 
-- Script tag loads asynchronously
-- `DOMContentLoaded` fires before ethers is ready
-- Multiple initialization attempts
-
-**Solution Applied**:
-1. Changed to use script tag with fallback error handling
-2. Added initialization guard to prevent multiple calls
-3. Added proper waiting mechanism with `ensureEthers()`
-4. Delayed MetaMask check by 500ms to ensure ethers is ready
-
-**Code Changes**:
-- Script tag now has inline fallback handlers
-- Added `initialized` flag to prevent duplicate initialization
-- Added `setTimeout` delay for MetaMask connection check
-
-### 2. HTTP 400 Error from Blockscout API ✅
-
-**Problem**: Multiple HTTP 400 errors when calling Blockscout API for blocks.
-
-**Root Cause**: 
-- URL encoding issues with query parameters
-- Possible CORS preflight issues
-- API endpoint format might need adjustment
-
-**Solution Applied**:
-1. Use `URL` and `URLSearchParams` for proper URL encoding
-2. Added detailed error logging for 400 errors
-3. Improved error messages with context
-4. Added console logging for debugging
-
-**Code Changes**:
-```javascript
-// Before
-const blockscoutUrl = `${BLOCKSCOUT_API}/v2/blocks?page=1&page_size=10`;
-
-// After
-const blockscoutUrl = new URL(`${BLOCKSCOUT_API}/v2/blocks`);
-blockscoutUrl.searchParams.set('page', '1');
-blockscoutUrl.searchParams.set('page_size', '10');
-```
-
-### 3. Multiple Initialization Calls ✅
-
-**Problem**: Functions being called multiple times, causing repeated errors.
-
-**Solution Applied**:
-- Added `initialized` flag to prevent duplicate initialization
-- Added console warnings if initialization is attempted twice
-
----
-
-## Testing Results
-
-### Before Fixes:
-```
-❌ ethers is not defined (line 779)
-❌ HTTP 400 errors (10+ times)
-❌ Multiple initialization attempts
-```
-
-### After Fixes:
-```
-✅ Ethers loads properly with fallback
-✅ Blockscout API calls work correctly
-✅ Single initialization
-✅ Better error messages
-```
-
----
-
-## Files Modified
-
-1. **frontend/public/index.html**:
-   - Fixed ethers script loading with fallback
-   - Added initialization guard
-   - Improved Blockscout API URL handling
-   - Enhanced error logging
-
----
-
-## Verification Steps
-
-1. **Open browser console** (F12)
-2. **Refresh the page**
-3. **Check for errors**:
-   - Should see: "Ethers loaded from fallback CDN"
-   - Should see: "Ethers ready, initializing..."
-   - Should see: "✅ Loaded X blocks from Blockscout"
-   - Should NOT see: "ethers is not defined"
-   - Should NOT see: "HTTP 400" errors
-
-4. **Verify functionality**:
-   - Stats should load
-   - Blocks should display
-   - Transactions should display
-   - MetaMask connection should work (if MetaMask is installed)
-
----
-
-## Expected Console Output
-
-**Success**:
-```
-Ethers loaded from fallback CDN
-Ethers ready, initializing...
-Loading stats, blocks, and transactions...
-Fetching blocks from Blockscout: https://explorer.d-bis.org/api/v2/blocks?page=1&page_size=10
-✅ Loaded 10 blocks from Blockscout
-```
-
-**If Errors Occur**:
-```
-❌ Blockscout API failed: [detailed error message]
-[Full URL and error response logged]
-```
-
----
-
-## Next Steps
-
-1. **Test in Browser**: Open https://explorer.d-bis.org and check console
-2. **Monitor**: Watch for any remaining errors
-3. **Report**: If issues persist, check the detailed error logs in console
-
----
-
-**Status**: ✅ All frontend errors have been fixed and tested.