Revert to pre-AI-SDK state (January 29, 2026) (#11462)

Revert to pre-AI-SDK state (commit 67e568f)

This commit reverts the codebase to the state before AI SDK migration work began.

Target commit: 67e568f - refactor: replace fetch_instructions with skill tool and built-in skills (#10913)
Date: January 29, 2026

This removes approximately 152 commits of AI SDK migration work.
A follow-up PR will add back bug fixes and features that are unrelated to AI SDK.

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: daniel-lxs

.env.sample

@@ -0,0 +1,6 @@
+POSTHOG_API_KEY=key-goes-here
+
+# Roo Code Cloud / Local Development
+CLERK_BASE_URL=https://epic-chamois-85.clerk.accounts.dev
+ROO_CODE_API_URL=http://localhost:3000
+ROO_CODE_PROVIDER_URL=http://localhost:8080/proxy/v1

.github/CODEOWNERS

@@ -1,2 +1,2 @@
 # These owners will be the default owners for everything in the repo
-* @mrubens @cte @jr @hannesrudolph @daniel-lxs
+* @mrubens @cte @jr

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,8 @@
 blank_issues_enabled: false
 contact_links:
+    - name: Feature Request
+      url: https://github.com/RooCodeInc/Roo-Code/discussions/categories/feature-requests
+      about: Share and vote on feature requests for Roo Code
     - name: Leave a Review
       url: https://marketplace.visualstudio.com/items?itemName=RooVeterinaryInc.roo-cline&ssr=false#review-details
       about: Enjoying Roo Code? Leave a review here!