fix(schema): stepName truncates at byte boundary for multi-byte UTF-8 steps

[greynewell]

Summary

stepName() extracted the HowToStep.name field for JSON-LD recipe structured data using byte operations:

• len(step) > 80 — checked byte count, not rune count
• step[:77] — byte slice that can land inside a multi-byte character
• idx < 80 — compared a byte offset to a character limit

For instruction steps with multi-byte UTF-8 characters (é, ñ, CJK, emoji), step[:77] could split a character's byte sequence, producing invalid UTF-8 that json.Marshal silently replaces with \uFFFD.

Fix: compute runes := []rune(step), use len([]rune(step[:idx+1])) for the sentence guard, and string(runes[:77]) for truncation.

Test plan

• TestStepName covers ASCII truncation (77+...=80 runes), sentence extraction, multi-byte step truncation (valid UTF-8, correct rune count), and multi-byte sentence guard
• Existing TestParseDurationMinutes and TestComputeTotalTime still pass
• go build ./... passes

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 33be0043-5434-4b71-b520-0be139409902

📥 Commits

Reviewing files that changed from the base of the PR and between 09bef24 and eb28d2c.

📒 Files selected for processing (2)

• internal/archdocs/pssg/schema/jsonld.go
• internal/archdocs/pssg/schema/jsonld_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-stepname-rune-truncation

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