fix(skills): refresh stale docs URLs and wren-engine repo references

[PaulChen79]

Summary

Cleans up two classes of stale references that survived the post-rebrand docs/repo reorg:

• Canner/wren-engine → Canner/WrenAI — top-level skills/index.json repository field + four per-skill repository fields, the Claude plugin manifest, the raw.githubusercontent.com Version-check URL in three SKILL.md files, the npx skills add command shown to users in those same three skills, the docs tree link in wren-usage, and the GitHub issues URL in the wren-onboarding error fallback.
• Docs path fixes:
  • docs/get_started/{installation,quickstart}.md → docs/core/get_started/{installation,quickstart}.md
  • docs/get_started/connect.md → docs/core/guides/connect.md (connect.md was relocated to guides/, not get_started/)
  • wren-usage doc tree link now points at WrenAI/tree/main/docs/core
  • wren-onboarding error-fallback hint now links to docs.getwren.ai/oss/introduction (the old oss/engine URL pattern no longer exists)
  • index.json wren-onboarding description text corrected to match the new connect.md path

After this PR, a repo-wide grep for Canner/wren-engine, docs/get_started/, and docs/core/get_started/connect.md inside skills/ returns zero hits.

Out of scope (kept for a separate decision)

• Broken section anchors in connect.md links (e.g. #troubleshooting, #per-datasource-setup-notes) — the new docs/core/guides/connect.md is slimmer and these anchors no longer exist; URLs degrade to page top. Treat as a content question rather than a URL fix.
• wren-onboarding install flow gap — separate wren --version "not installed" branch and the pip install step buried inside Step 2's batch can let agents skip installation; deferred to its own change.

Test plan

• grep -rnE 'Canner/wren-engine|docs/get_started/|docs\.getwren\.ai/oss/engine' skills/ returns no hits.
• Each updated URL resolves to a real page (installation.md, quickstart.md, connect.md, docs tree, intro page, issues page).
• skills/index.json still parses as valid JSON and npx skills add Canner/WrenAI --skill wren-onboarding runs against the renamed repo.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated repository references and documentation links across skill configurations and documentation files to reflect organizational changes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: ef3218ee-620b-4f87-aa88-f7895d251fbb

📥 Commits

Reviewing files that changed from the base of the PR and between 025dc71 and a7e091e.

📒 Files selected for processing (5)

• skills/.claude-plugin/plugin.json
• skills/index.json
• skills/wren-generate-mdl/SKILL.md
• skills/wren-onboarding/SKILL.md
• skills/wren-usage/SKILL.md

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Walkthrough

This PR updates repository references across skill plugin configuration and documentation from the legacy Canner/wren-engine repository to Canner/WrenAI. Changes include plugin metadata, skill manifest entries, and user-facing documentation links in skill instruction files.

Changes

Repository reference migration

Layer / File(s)	Summary
Plugin and manifest metadata skills/.claude-plugin/plugin.json, skills/index.json	Plugin configuration and skill index metadata are updated to point to the new WrenAI repository. The top-level repository URL is changed, the wren-onboarding description path is updated to docs/core/guides/connect.md, and each skill (wren-onboarding, wren-dlt-connector, wren-generate-mdl, wren-usage) gains a repository field pointing to its directory in WrenAI.
Skill documentation and instruction updates skills/wren-generate-mdl/SKILL.md, skills/wren-onboarding/SKILL.md, skills/wren-usage/SKILL.md	Version-check instructions now fetch versions.json from WrenAI, and example update commands reference the new repository. User-facing documentation links throughout the onboarding skill—demo routing, per-datasource setup notes, troubleshooting references, and final error/issue guidance—are updated to point to WrenAI docs paths and issue tracker.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Canner/WrenAI#2230: Both PRs update repository/metadata URLs from Canner/wren-engine to Canner/WrenAI in manifest and documentation fields.

Suggested labels

documentation, core

Suggested reviewers

• cyyeh
• goldmedal

Poem

🐰 Whiskers twitch with glee,
URLs dance from old to new,
WrenAI, wild and free,
A reference refreshed through and through!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main objective: refreshing stale documentation URLs and repository references from wren-engine to WrenAI across the skills bundle.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/fix-skills-issue

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