chore: clean up duplicate task-016 files

Removed auto-generated duplicates that were overwritten.
Correct tasks are now task-018 and task-019.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

backlog/tasks/task-016 - Configure-CryptID-secrets-and-environment-variables.md

@@ -1,41 +0,0 @@
----
-id: task-016
-title: Configure CryptID secrets and environment variables
-status: To Do
-assignee: []
-created_date: '2025-12-04 12:00'
-labels:
-  - infrastructure
-  - cloudflare
-  - cryptid
-  - secrets
-  - email
-dependencies:
-  - task-015
-priority: high
----
-
-## Description
-
-<!-- SECTION:DESCRIPTION:BEGIN -->
-Set up the required secrets and environment variables for CryptID email functionality on Cloudflare Workers.
-
-**Required Secrets:**
-- SENDGRID_API_KEY - For sending verification emails
-- CRYPTID_EMAIL_FROM - Sender email address (e.g., auth@jeffemmett.com)
-- APP_URL - Base URL for verification links (e.g., https://canvas.jeffemmett.com)
-
-**Configuration:**
-- Secrets set for both production and dev environments
-- SendGrid account configured with verified sender domain
-- Email templates tested
-<!-- SECTION:DESCRIPTION:END -->
-
-## Acceptance Criteria
-<!-- AC:BEGIN -->
-- [ ] #1 SENDGRID_API_KEY secret set via wrangler secret put
-- [ ] #2 CRYPTID_EMAIL_FROM secret configured
-- [ ] #3 APP_URL environment variable set in wrangler.toml
-- [ ] #4 SendGrid sender domain verified (jeffemmett.com or subdomain)
-- [ ] #5 Test email sends successfully from Worker
-<!-- AC:END -->

backlog/tasks/task-016 - Create-Cloudflare-D1-cryptid-auth-database.md

@@ -1,43 +0,0 @@
----
-id: task-016
-title: Create Cloudflare D1 cryptid-auth database
-status: To Do
-assignee: []
-created_date: '2025-12-04 12:00'
-labels:
-  - infrastructure
-  - cloudflare
-  - d1
-  - cryptid
-  - auth
-  - security
-dependencies: []
-priority: high
----
-
-## Description
-
-<!-- SECTION:DESCRIPTION:BEGIN -->
-Create the D1 database on Cloudflare for CryptID authentication system. This is the first step before deploying the email recovery feature.
-
-**Database Purpose:**
-- Store user accounts linked to CryptID usernames
-- Store device public keys for multi-device auth
-- Store verification tokens for email/device linking
-- Enable account recovery via verified email
-
-**Security Considerations:**
-- Emails should be encrypted at rest (Phase 2)
-- Public keys are safe to store (not secrets)
-- Tokens are time-limited and single-use
-- No passwords stored (WebCrypto key-based auth)
-<!-- SECTION:DESCRIPTION:END -->
-
-## Acceptance Criteria
-<!-- AC:BEGIN -->
-- [ ] #1 D1 database 'cryptid-auth' created via wrangler d1 create
-- [ ] #2 D1 database 'cryptid-auth-dev' created for dev environment
-- [ ] #3 Database IDs added to wrangler.toml (replacing placeholders)
-- [ ] #4 Schema from worker/schema.sql deployed to both databases
-- [ ] #5 Verified tables exist: users, device_keys, verification_tokens
-<!-- AC:END -->