indexer: surface op outcomes via simulate errors + OpStatus column

[wilfreddenton]

Note

Medium Risk
Adds a new DB column and API surface changes (OpWithResult enum + OpStatus) that affect persisted data, TypeScript bindings, and transaction execution/simulation plumbing; mistakes could break result queries or client decoding.

Overview
/transactions/simulate now surfaces per-op deterministic failure details by collecting errors during execution and attaching them as error_message on each returned OpWithResult entry (while /inspect continues to return error_message: None).

The response shape is updated from a struct to a tagged OpWithResult enum with Materialized vs Rejected variants, and ops now carry an explicit op_index in OpMetadata for stable positional alignment.

Result persistence is extended with an OpStatus enum: contract_results gains a non-null status column, the runtime classifies execution outcomes (Ok/ContractErr/OutOfFuel/Trap/Other), and queries/insert paths + TS bindings are updated accordingly; new tests cover simulate error surfacing and status classification.

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