docs(custom-drivers): document countTokens() on custom text handlers - #61
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TextHandler requires countTokens() (added in v3.6.0), but the custom-drivers guide's example and interface table omitted it, so a handler built from the docs failed to load. Document countTokens() with a drop-in implementation via the CountsTokens trait (heuristic estimate when a provider has no native count endpoint), and add it to the interface table. Update the sandbox custom-driver example to match. The feature itself is correct (all first-party handlers implement it; live token-counting verified 22/22) — this is a docs gap only.
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TextHandlerrequirescountTokens()(added in v3.6.0), but the custom-drivers guide's example and interface table omitted it — a handler built from the docs failed to load. DocumentscountTokens()with a drop-in implementation via theCountsTokenstrait (heuristic estimate when a provider has no native count endpoint), adds it to the interface table, and updates the sandbox custom-driver example to match.The feature itself is correct (all first-party handlers implement it; live token-counting verified 22/22) — docs gap only.