chore: open-source release cleanup (#208)

- Remove internal planning docs (FEATURES_*.md, IMPLEMENTATION_PLAN.md,
  PLATFORM_ENGINEER_SIMULATION.md, STATS.md)
- Remove internal scripts (beta.ts, duplicate-pr.ts, stats.ts)
- Remove internal CI workflows (beta.yml, stats.yml)
- Remove `.github/TEAM_MEMBERS` (internal employee list)
- Remove `.zed/` (single dev's editor config)
- Remove `docs/design/` (internal product strategy)
- Move `RELEASING.md` to `docs/`
- Fix `pr-management.yml`: remove broken `check-duplicates` job, keep
  `add-contributor-label`
- Fix `opencode.yml`: replace self-hosted runner with `ubuntu-latest`
- Standardize internal placeholder URLs to `altimate-code.internal`

Closes #207

Author: anandgupta42

.github/CODEOWNERS

@@ -13,7 +13,7 @@ jobs:
       startsWith(github.event.comment.body, '/altimate') ||
       contains(github.event.comment.body, ' /ac') ||
       startsWith(github.event.comment.body, '/ac')
-    runs-on: blacksmith-4vcpu-ubuntu-2404
+    runs-on: ubuntu-latest
     permissions:
       id-token: write
       contents: read

.github/TEAM_MEMBERS

@@ -5,72 +5,6 @@ on:
     types: [opened]
 
 jobs:
-  check-duplicates:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      pull-requests: write
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 1
-
-      - name: Check team membership
-        id: team-check
-        run: |
-          LOGIN=$(echo "${{ github.event.pull_request.user.login }}" | tr '[:upper:]' '[:lower:]')
-          if [ "$LOGIN" = "opencode-agent[bot]" ] || grep -qixF "$LOGIN" .github/TEAM_MEMBERS; then
-            echo "is_team=true" >> "$GITHUB_OUTPUT"
-            echo "Skipping: $LOGIN is a team member or bot"
-          else
-            echo "is_team=false" >> "$GITHUB_OUTPUT"
-          fi
-
-      - name: Setup Bun
-        if: steps.team-check.outputs.is_team != 'true'
-        uses: ./.github/actions/setup-bun
-
-      - name: Install dependencies
-        if: steps.team-check.outputs.is_team != 'true'
-        run: bun install
-
-      - name: Install altimate-code
-        if: steps.team-check.outputs.is_team != 'true'
-        run: npm install -g @altimateai/altimate-code
-
-      - name: Build prompt
-        if: steps.team-check.outputs.is_team != 'true'
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          PR_NUMBER: ${{ github.event.pull_request.number }}
-        run: |
-          {
-            echo "Check for duplicate PRs related to this new PR:"
-            echo ""
-            echo "CURRENT_PR_NUMBER: $PR_NUMBER"
-            echo ""
-            echo "Title: $(gh pr view "$PR_NUMBER" --json title --jq .title)"
-            echo ""
-            echo "Description:"
-            gh pr view "$PR_NUMBER" --json body --jq .body
-          } > pr_info.txt
-
-      - name: Check for duplicate PRs
-        if: steps.team-check.outputs.is_team != 'true'
-        env:
-          OPENCODE_API_KEY: ${{ secrets.OPENCODE_API_KEY }}
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          PR_NUMBER: ${{ github.event.pull_request.number }}
-        run: |
-          COMMENT=$(bun script/duplicate-pr.ts -f pr_info.txt "Check the attached file for PR details and search for duplicates")
-
-          if [ "$COMMENT" != "No duplicate PRs found" ]; then
-            gh pr comment "$PR_NUMBER" --body "_The following comment was made by an LLM, it may be inaccurate:_
-
-          $COMMENT"
-          fi
-
   add-contributor-label:
     runs-on: ubuntu-latest
     permissions:

.github/VOUCHED.td

@@ -24,6 +24,9 @@ target
 .scripts
 .direnv/
 
+# Commit message scratch files
+.github/meta/
+
 # Local dev files
 opencode-dev
 logs/