fix(trello): send card text updates in request body

[aaight]

Summary

Fixes Trello card title/description updates so mutable card text is sent in a JSON request body instead of through the trello.js update path that can place long descriptions in the URL.

Card: https://trello.com/c/6a004c640c9f21691d4d0e64

Changes

• Routes trelloClient.updateCard() through the existing authenticated trelloFetch() helper with PUT /cards/{id} and Content-Type: application/json.
• Builds the update body with name and desc only when they are explicitly provided, preserving desc: "" for clearing descriptions.
• Updates Trello client tests to assert long descriptions are present in RequestInit.body and absent from the URL.

Validation

• npx vitest run --project unit-core tests/unit/trello/client.test.ts tests/unit/pm/trello/adapter.test.ts tests/unit/gadgets/pm/core/updateWorkItem.test.ts tests/unit/cli/file-input-flags.test.ts
• npm run lint:fix
• npm run lint
• npm run typecheck
• npm test

Docs

No docs update needed; the public cascade-tools pm update-work-item --description-file contract is unchanged.

🕵️ codex · gpt-5.5 · run details

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[nhopeatall]

LGTM - The Trello card update path now uses the existing authenticated JSON-body helper, keeps mutable card text out of the URL, and the focused Trello client regression test passes locally.

🕵️ codex · gpt-5.5 · run details