Enforce a maximum ticket supply in the ticket contract

[priscaenoch]

Problem

ticket/src/lib.rs exposes mint_ticket and a tickets_sold counter, but there is no maximum supply: mint_ticket can be called indefinitely and tickets_sold only counts upward. For an event-ticketing contract, an uncapped supply means an organizer (or a bug) can mint beyond the intended allocation, and downstream consumers have no on-chain guarantee of scarcity.

What needs to be done

• Add a maximum-supply parameter set at initialize (stored in instance storage).
• Enforce it in mint_ticket: reject minting once tickets_sold reaches the maximum, returning a typed Error (add a "sold out"/"supply exceeded" variant).
• Add a read-only getter for the configured maximum and the remaining supply.
• Extend the instance TTL on the mint write and keep the existing event emissions.

Files

• ticket/src/lib.rs

Acceptance deliverables

• Minting beyond the configured maximum is rejected with a typed error.
• The maximum and remaining supply are queryable on-chain.
• All CI checks pass; the change cannot be merged until CI is green.

Tests to pass

• Test: minting up to the maximum succeeds and the next mint returns the typed error.
• Test: the remaining-supply getter decreases correctly as tickets are minted.

[Ayinkx01]

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