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Fixes from the PR #26 adversarial review (graded 18 real / 0 false positive). Correctness / security - maxGardenCM fixed to 10_000 (100 m), matching its comment — it was 100_000 cm (1 km), 10x too lax (5 models flagged this). - Dimension validation now rejects NaN/Inf (which slip past naive comparisons) and subnormal-tiny positives, via a finite [1cm, 100m] check. Name (200) and notes (10_000) are length-capped so untrusted input can't balloon storage. - Update version binding is `required,min=1`, so a negative/zero version is a 400, not a 409. Maintainability / performance - One unified writeServiceError (new errors.go) maps every auth + resource sentinel; writeResourceError removed. writeVersionConflict and parseIDParam moved to errors.go (shared, not in the gardens feature file). - Request structs share an embedded gardenFields (one toInput). - CreateGarden uses INSERT ... RETURNING (one round-trip). - ListGardensForOwner has a defensive LIMIT (pagination is post-v1). Tests: name/notes length, NaN/Inf/subnormal dims, dimension-at-cap valid, negative/zero version -> 400. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]> Claude-Session: https://claude.ai/code/session_01JdQpdYYsTgtkJBxbcpAszi