Add --table-mapping and --strip-helpers CLI options

[keithharvey]

Summary

Two new CLI options for generating context-specific type subsets from the same source files:

• --table-mapping "OldName:NewName" remaps the first segment of qualified table names in the output (e.g. Spring.GetGameFrame → SpringSynced.GetGameFrame). Can be specified multiple times.
• --strip-helpers removes standalone helper type definitions (classes, enums, aliases) from the output, keeping only function and table declarations. Prevents duplicate types when generating context-specific outputs alongside per-file outputs.

Motivation

The Recoil engine exposes a single Spring table in Lua, but different contexts (synced vs unsynced) have access to different subsets of functions. These options allow generating SpringSynced and SpringUnsynced type libraries from the same C++ sources without duplicating shared helper types that already exist in the per-file output.

Enabled Recoil PR

beyond-all-reason/RecoilEngine#2799

Changes

• src/tableMapping.ts — new DocProcessor that remaps table name prefixes
• src/stripHelpers.ts — new DocProcessor that filters out non-function/table docs
• src/cli.ts — two new CLI options
• src/index.ts — processDocs now accepts ProcessDocsOptions object (backward compatible)
• 16 new tests across tableMapping.test.ts and stripHelpers.test.ts
• Version bump to 3.4.0

LLM Disclosure

Opus 4.6 with a lot of prodding and testing by me.

[keithharvey]

Closing in favor of #77