diff --git a/.github/ISSUE_TEMPLATE/bug_report.md b/.github/ISSUE_TEMPLATE/bug_report.md
index 8de9729..ca5312c 100644
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -18,11 +18,13 @@ assignees: ""
 ## Environment
 
 - opencode version (`opencode --version`):
-- OS:
-- Shell:
-- Install method: `./install.sh` / manual / other
+- OS and version (macOS / Linux / Windows):
+- Shell (bash, zsh, PowerShell 5.1, PowerShell 7):
+- Install method: `./install.sh` / `install.ps1` / manual / other
 
-## `./install.sh --check` output
+## Install check output
+
+macOS/Linux: `./install.sh --check` — Windows: `.\install.ps1 -Check`
 
 ```text
 paste the output here
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 263a730..3028ca9 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -5,8 +5,8 @@
 ## Checklist
 
 - [ ] `ruby scripts/validate.rb` passes
-- [ ] `bash -n install.sh scripts/*.sh` passes
-- [ ] `./scripts/smoke-install.sh` passes
+- [ ] macOS/Linux: `bash -n install.sh scripts/*.sh` and `./scripts/smoke-install.sh` pass
+- [ ] Windows: `.\scripts\smoke-install.ps1` passes (CI also runs it on `windows-latest`)
 - [ ] New frontmatter `description` values are quoted when they contain `: `
 - [ ] `team.yaml` references resolve (`agent`, `skill`, profile stage ids)
 - [ ] README updated if a command, flag, agent or stage changed
diff --git a/.github/workflows/welcome.yml b/.github/workflows/welcome.yml
deleted file mode 100644
index 5685cc7..0000000
--- a/.github/workflows/welcome.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-name: welcome
-
-on:
-  issues:
-    types: [opened]
-  pull_request_target:
-    types: [opened]
-
-permissions:
-  issues: write
-  pull-requests: write
-
-jobs:
-  welcome:
-    runs-on: ubuntu-latest
-    timeout-minutes: 5
-    # Only greet first-time human contributors: skip the maintainer and any bot
-    # (Dependabot, github-actions[bot], ...), and only when the actor is the author.
-    if: >-
-      github.actor != github.repository_owner &&
-      !endsWith(github.actor, '[bot]') &&
-      (
-        github.event_name == 'issues' &&
-        github.event.issue.user.login == github.actor ||
-        github.event_name == 'pull_request_target' &&
-        github.event.pull_request.user.login == github.actor
-      )
-    steps:
-      - uses: actions/first-interaction@1c4688942c71f71d4f5502a26ea67c331730fa4d # v3.1.0
-        with:
-          repo_token: ${{ secrets.GITHUB_TOKEN }}
-          issue_message: "Thanks for your first issue. Please include your opencode version and the output of `./install.sh --check`."
-          pr_message: "Thanks for your first pull request. Run `ruby scripts/validate.rb` and `./scripts/smoke-install.sh` before review."