v1.6.0 — Fix Mode B receipt flow

Breaking change

Removed the auto-attach of ArkForge credit purchase receipts as payment_evidence.

Before (wrong): After agent.py credits, the Stripe receipt URL was saved locally and automatically attached to all subsequent scan and pay calls as payment_evidence.

After (correct): payment_evidence is only attached when explicitly passed via --receipt-url. The receipt must come from a direct Stripe payment to the provider — not from buying credits at ArkForge.

Why

ArkForge does not handle money. The two payment flows are completely separate:

• ArkForge credits: fee to ArkForge for the certification service (0.10 EUR/proof)
• Provider payment (Mode B): direct Stripe payment from agent to provider — the agent attaches this receipt to prove the payment

Attaching the ArkForge credit receipt as payment_evidence was architecturally incorrect.

Changes

• Removed: RECEIPT_FILE, _save_receipt(), _load_receipt(), _key_mode()
• Simplified: _resolve_receipt() — only extracts explicit --receipt-url
• Updated: _cmd_credits() — displays receipt with clarifying note (not for Mode B)
• Updated: docstring and help text
• Version: 1.6.0

v1.4.0 — Auto-attach Stripe receipt

What's new

Auto-receipt: after buying credits (credits command), the Stripe receipt URL is automatically saved locally and attached to subsequent scan/pay calls as payment evidence — zero extra flags needed.

Features

• Receipt auto-saved to .last_receipt.json after credits purchase
• Auto-attached as payment_evidence on scan and pay commands
• --receipt-url URL to override with a specific receipt
• --no-receipt to skip auto-attach for a single call
• .gitignore added (runtime state, pycache, logs, proofs)

Previous (v1.3.0)

• --receipt-url manual flag for external receipt verification
• Payment evidence display in scan/pay/verify output