feat(config): add typed event runtime options

[plexoos]

• Add event.max_genstep to app config and apply it through SEventConfig::SetMaxGenstep.
• Add configurable event.mode_lite and event.mode_merge options with typed ModeLite / ModeMerge enums.
• Introduce a shared named-enum config reader for string-valued config parameters.
• Reuse the named-enum reader for event.mode, event.mode_lite, event.mode_merge, torch.gentype, and torch.type.
• Keep config keys ordered consistently in config/dev.json and Config.

Behavior

• mode_lite and mode_merge use string names such as "Unspecified", "Lite", and "Merged" instead of numeric values.
• torch.gentype remains restricted to "TORCH".
• Invalid torch.type values now fail with a clear config error instead of silently becoming T_UNDEF.

[plexoos]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Nice work!

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[Copilot]

Pull request overview

This PR extends the application-level configuration layer (gphox::Config) to support additional event runtime options (max gensteps, lite storage mode, merge mode) and centralizes string-to-enum parsing via a shared named-enum reader, then synchronizes these settings into SEventConfig in Config::Apply().

Changes:

• Added event.max_genstep to config/state and applied it via SEventConfig::SetMaxGenstep.
• Introduced typed ModeLite / ModeMerge enums and corresponding event.mode_lite / event.mode_merge string config options, applied conditionally.
• Reworked string-valued enum config parsing with a shared named-enum reader and reused it for event.mode, torch.gentype, and torch.type (now rejecting invalid torch.type values with a clear error).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
sysrap/config.h	Adds ModeLite/ModeMerge enums and new Config fields (max_genstep, mode_lite, mode_merge) aligned with event runtime options.
sysrap/config.cpp	Implements a generic named-enum reader, updates config parsing for event/torch enum-like fields, and applies new options to SEventConfig.
config/dev.json	Adds event.max_genstep, event.mode_lite, and event.mode_merge keys and keeps ordering consistent with Config.

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