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/COMPLETION_SUMMARY.md

@@ -1,97 +0,0 @@
-# Tiered Architecture Implementation - Completion Summary
-
-## ✅ ALL NEXT STEPS COMPLETED
-
-All implementation steps have been completed successfully. The tiered architecture is fully integrated and ready for deployment.
-
-## Completed Components
-
-### 1. ✅ Database Schema
-- Full migration file: `backend/database/migrations/0010_track_schema.up.sql`
-- Shared-DB auth/operator migration: `backend/database/migrations/0010_track_schema.auth_only.sql`
-- Rollback file: `backend/database/migrations/0010_track_schema.down.sql`
-- Helper script: `scripts/run-migration-0010.sh` (auto-detects DB mode)
-
-### 2. ✅ JWT Secret Configuration
-- Server reads `JWT_SECRET` from environment variable
-- Default fallback with warning for development
-- WalletAuth properly initialized
-
-### 3. ✅ Track Routes Integration
-- All track routes wired with proper middleware
-- Track 1: Public (OptionalAuth)
-- Track 2-4: Authenticated (RequireAuth + RequireTrack)
-- File: `backend/api/rest/track_routes.go`
-
-### 4. ✅ Setup Scripts
-- `scripts/setup-tiered-architecture.sh` - Complete setup
-- `scripts/approve-user.sh` - User approval
-- `scripts/add-operator-ip.sh` - IP whitelist
-- `scripts/verify-tiered-architecture.sh` - Verification
-
-### 5. ✅ Dependencies
-- JWT package: `github.com/golang-jwt/jwt/v4` ✅
-- All imports verified ✅
-- Linter errors resolved ✅
-
-### 6. ✅ Frontend Integration
-- Wallet connect UI added ✅
-- Feature gating JavaScript implemented ✅
-- Track-based UI visibility ✅
-- Auth token storage in localStorage ✅
-
-### 7. ✅ Documentation
-- API contracts: `docs/api/track-api-contracts.md` ✅
-- Feature matrix: `docs/feature-flags/track-feature-matrix.md` ✅
-- Setup guide: `docs/TIERED_ARCHITECTURE_SETUP.md` ✅
-- Implementation summary: `docs/TIERED_ARCHITECTURE_IMPLEMENTATION.md` ✅
-- Next steps: `docs/NEXT_STEPS_COMPLETE.md` ✅
-
-## Verification Results
-
-```
-✅ All critical components verified!
-Errors: 0
-Warnings: 0
-```
-
-## Quick Start Commands
-
-```bash
-# 1. Run setup
-cd explorer-monorepo
-bash scripts/setup-tiered-architecture.sh
-
-# 2. Set environment variables
-export JWT_SECRET="your-strong-secret-here"
-export RPC_URL="http://192.168.11.250:8545"
-
-# 3. Run migration helper
-bash scripts/run-migration-0010.sh
-
-# 4. Start server
-cd backend
-go build -o bin/api-server ./api/rest/cmd
-./bin/api-server
-```
-
-## Architecture Status
-
-- **Track 1 (Public)**: ✅ Fully implemented with RPC gateway, caching, rate limiting
-- **Track 2 (Approved)**: ✅ Fully implemented with indexers and API endpoints
-- **Track 3 (Analytics)**: ✅ Fully implemented with analytics engine
-- **Track 4 (Operator)**: ✅ Fully implemented with security and audit logging
-- **Authentication**: ✅ Wallet-based auth with JWT tokens
-- **Feature Gating**: ✅ Frontend and backend feature flags
-- **Route Integration**: ✅ All routes wired with middleware
-
-## Ready for Production
-
-The implementation is complete and ready for:
-1. Database migration execution
-2. Environment variable configuration
-3. User approval and track assignment
-4. Indexer startup
-5. Production deployment
-
-All code has been verified, linter errors resolved, and documentation completed.