Add GitHub wiki content and sync tooling; simplify CI artifact handling

[knoxhack]

Motivation

• Provide an on-repo source-of-truth for the project wiki and document the process to publish it to the GitHub Wiki repository.
• Add a small helper to make ongoing wiki synchronization easy and visible in the README.
• Simplify and adjust the CI build workflow to change how release verification and artifact collection are handled.

Description

• Added a wiki/ collection of markdown pages (Home.md, Getting-Started.md, Architecture.md, Addon-Development.md, Build-and-Release.md, Modules-and-Versions.md, Progression-Guide.md, Troubleshooting.md, Lore-and-World-Canon.md) to serve as the source-of-truth for the GitHub Wiki.
• Added docs/wiki_publish.md with step-by-step instructions for bootstrapping and syncing the Wiki, and updated README.md to reference the new Wiki publishing guidance.
• Added an executable helper tools/sync_wiki.sh to copy wiki/*.md into a checked-out Echo.wiki repo and print the next git steps.
• Modified .github/workflows/build.yml to adjust the release/verification and artifact collection steps (changed how ./gradlew verifyEchoRelease and artifact collection are invoked and removed the previous artifact upload/summary steps in favor of the updated collection flow).

Testing

• No automated test runs were included in this PR; CI workflow changes will be exercised when the repository's GitHub Actions run on the updated build workflow. }

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Mirror wiki deletions when syncing

The helper is documented as an ongoing wiki sync tool, but this copy step only adds or overwrites files and never removes markdown pages that were deleted or renamed in wiki/. In that scenario, stale pages remain in Echo.wiki and continue to be published, so the wiki can drift from the repo source-of-truth over time. Consider using a delete-aware sync (for example rsync --delete or an explicit cleanup pass) so removals are propagated.

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