feat(inbox): add sample inbox files for file processing workflow demo

Adds 5 realistic test files: Amazon receipt, freelance contract draft,
web design invoice, product sync meeting notes, and an app bug screenshot.
These serve as demo input for the file-processor skill.

cowork-complete-guide/inbox/amazon_receipt_march.txt

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+Order Confirmation - Amazon.com
+
+Order #112-4857291-6637842
+Order Date: March 7, 2026
+
+Items Ordered:
+- Anker USB-C Hub 7-in-1  x1    $34.99
+- Screen Cleaning Kit      x1    $12.49
+
+Subtotal:   $47.48
+Shipping:    $0.00 (Prime)
+Tax:         $4.27
+Total:      $51.75
+
+Shipped to: Tien N., 123 Main St, San Francisco CA 94105
+Payment: Visa ending in 4242

cowork-complete-guide/inbox/contract_freelance_draft.txt

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+FREELANCE SERVICE AGREEMENT (DRAFT)
+
+Between: Tien N. ("Client")
+And: Jordan Rivera ("Contractor")
+Date: March 2026
+
+SCOPE OF WORK
+Contractor agrees to provide content writing services including blog posts,
+newsletter copy, and social media captions for a period of 3 months
+(April–June 2026).
+
+COMPENSATION
+$75 per hour, estimated 10 hours/month. Invoiced monthly.
+
+DELIVERABLES
+- 4 blog posts per month (800–1200 words each)
+- 1 monthly newsletter (500 words)
+- 12 social media captions per month
+
+TERMS
+- Client may terminate with 14 days written notice
+- Work product owned by Client upon full payment
+- Contractor retains right to list work in portfolio
+
+[DRAFT – NOT SIGNED]

cowork-complete-guide/inbox/invoice_webdesign.txt

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+INVOICE
+
+From: Pixel & Co. Design Studio
+To: Tien N.
+Invoice #: INV-2026-084
+Date: March 1, 2026
+Due: March 31, 2026
+
+Services:
+- Website redesign (homepage + 3 pages)   $1,200.00
+- Logo refresh                               $350.00
+- Monthly maintenance retainer (March)      $150.00
+
+Subtotal:  $1,700.00
+Tax (8%):    $136.00
+TOTAL DUE: $1,836.00
+
+Payment via bank transfer or PayPal: billing@pixelandco.com

cowork-complete-guide/inbox/meeting_notes_product_sync.txt

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+Product Sync – Meeting Notes
+Date: March 6, 2026
+Attendees: Tien, Sarah, Marcus, Dev team
+
+AGENDA
+1. Q1 roadmap review
+2. Bug backlog triage
+3. Launch date for v2.1
+
+NOTES
+- Q1 roadmap: on track. Auth module done, dashboard 80% complete.
+- Bug backlog: 12 open issues, 4 critical. Marcus to fix #88 and #91 by EOW.
+- v2.1 launch: targeting March 28. Need QA sign-off by March 24.
+
+ACTION ITEMS
+- Tien: send updated timeline to stakeholders by Tuesday
+- Sarah: draft release notes template
+- Marcus: patch critical bugs, PR by Friday
+- Dev team: final regression tests March 22–23
+
+Next sync: March 13, 10am

cowork-complete-guide/inbox/screenshot_app_bug.txt

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+[Screenshot captured: March 8, 2026 at 2:14 PM]
+[File: screenshot_app_bug.png — represented as text for demo]
+
+App: Dashboard v2.0
+Screen: User Settings > Notifications
+
+Bug observed: Toggle switch for "Email Notifications" is unresponsive on mobile.
+Tested on: iPhone 15, iOS 18.2, Safari
+Reproducible: Yes, 100% of attempts
+
+Steps to reproduce:
+1. Log in on mobile browser
+2. Navigate to Settings > Notifications
+3. Tap the Email Notifications toggle
+4. Toggle does not change state
+
+Expected: Toggle switches on/off
+Actual: No state change, no error message