Sync upstream

[gabrielhartog-invillia]

Sync fork

[Copilot]

Pull request overview

Syncs this fork with upstream updates, primarily modernizing the exercise content from “prompt files” to “Agent Skills”, refreshing documentation assets, and bumping several GitHub Actions/workflow dependencies.

Changes:

• Update exercise workflows to newer skills/exercise-toolkit references and adjust Step 3 checks to look for .github/skills/.../SKILL.md.
• Refresh exercise step markdown (Steps 1–4) including switching images to repo-local assets and updating Step 3/4 guidance to skills + custom agents.
• Update the devcontainer to a base:jammy image with Node + Python features.

Reviewed changes

Copilot reviewed 11 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
config.json	Normalizes JSON formatting in the assignments list.
.github/workflows/0-start-exercise.yml	Updates upstream toolkit usage and action versions for the exercise bootstrap flow.
.github/workflows/1-step.yml	Updates workflow dependencies for Step 1 checks and posting Step 2 content.
.github/workflows/2-step.yml	Updates workflow dependencies for Step 2 checks and posting Step 3 content.
.github/workflows/3-step.yml	Updates Step 3 trigger paths and validates the new skill structure (SKILL.md).
.github/workflows/4-step.yml	Updates workflow dependencies for Step 4 checks, review posting, and finishing the exercise.
.github/steps/1-step.md	Switches images to repo-local paths and minor markdown formatting fixes.
.github/steps/2-step.md	Adds instruction frontmatter description and switches images to repo-local paths.
.github/steps/3-step.md	Reworks Step 3 to teach Agent Skills (skill folder structure, SKILL.md, references, scripts).
.github/steps/4-step.md	Reworks Step 4 agent example to include handoffs and repo-local images.
.devcontainer/devcontainer.json	Switches to a base image and installs Node/Python via devcontainer features; adds Copilot Chat extension.

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