fix(qoder): omit scalar answer key for AskUserQuestion strict schema

[ri-char]

Problem

When a Qoder CLI agent asks the user a question and the user answers from the CodeIsland popup, the CLI rejects the hook response with:

params must NOT have additional properties

Fixed #300.

Root cause

Qoder CLI re-validates hookSpecificOutput.decision.updatedInput against the AskUserQuestion tool schema using Ajv (the params prefix comes from errorsText({ dataVar: "params" })). That schema is additionalProperties: false and only allows questions / answers / annotations / metadata.

CodeIsland's askUserQuestionUpdatedInput also injects a scalar answer key alongside answers, which trips the strict validation and voids the whole answer.

Changes

• Add AppState.isQoderEvent (mirrors the existing isZcodeEvent pattern) to detect qoder / qoder-cli sources via _source.
• Skip the scalar answer injection for Qoder sources in askUserQuestionUpdatedInput; answers flow through the schema-allowed answers dict keyed by question text, which Qoder remaps correctly. Other CLIs keep the existing behavior.