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pansy/internal/service
steveandClaude Opus 4.8 3fbefa4e05
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Address Gadfly review on #7: garden cap, dim validation, shared errors
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
2026-07-18 18:39:27 -04:00
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