Strengthen PR body instructions to auto-close issues (#186)

Update Build and Prompt mode instructions to explicitly reference
`issue_number` from EVENT DATA and instruct agents to include
"Closes #<issue_number>" in PR bodies when working in the context
of an issue (where `is_pr` is not true).

Co-authored-by: pullfrog[bot] <226033991+pullfrog[bot]@users.noreply.github.com>

entry

@@ -139258,7 +139258,7 @@ function computeModes() {
 8. ${reportProgressInstruction}
 
 9. Determine whether to create a PR (if not already on a PR branch):
-   - **Default behavior**: Create a PR using ${ghPullfrogMcpName}/create_pull_request with an informative title and body. If relevant, indicate which issue the PR addresses (e.g. "Fixes #123").
+   - **Default behavior**: Create a PR using ${ghPullfrogMcpName}/create_pull_request with an informative title and body. If you are working in the context of an issue (check EVENT DATA for \`issue_number\` where \`is_pr\` is not true), include "Closes #<issue_number>" in the PR body to auto-close the issue when merged.
    - **Branch-only request**: If the user explicitly asks for a branch without a PR (e.g. "don't create a PR", "branch only", "just create a branch"), do NOT create a PR. Simply push the branch and report the branch link.
 
 10. Call report_progress one final time ONLY if you haven't already included all the important information (PR links, branch links, summary) in a previous report_progress call. If you already called report_progress with complete information including PR links after creating the PR, you do NOT need to call it again. Only make a final call if you need to add missing information. When making the final call, ensure it includes:
@@ -139431,7 +139431,7 @@ ${permalinkTip}`
    - Use ${ghPullfrogMcpName}/commit_files to commit your changes, then ${ghPullfrogMcpName}/push_branch to push the branch. Do NOT use git commands directly (\`git commit\`, \`git push\`, \`git checkout\`, \`git branch\`) as these will use incorrect credentials.
    - Test your changes to ensure they work correctly.
    - Determine whether to create a PR:
-     - **Default behavior**: Create a PR using ${ghPullfrogMcpName}/create_pull_request with an informative title and body. If relevant, indicate which issue the PR addresses (e.g. "Fixes #123"). Include links to the issue or comment that triggered the PR in the PR body.
+     - **Default behavior**: Create a PR using ${ghPullfrogMcpName}/create_pull_request with an informative title and body. If you are working in the context of an issue (check EVENT DATA for \`issue_number\` where \`is_pr\` is not true), include "Closes #<issue_number>" in the PR body to auto-close the issue when merged.
      - **Branch-only request**: If the user explicitly asks for a branch without a PR (e.g. "don't create a PR", "branch only", "just create a branch"), do NOT create a PR. Simply push the branch and report the branch link.
 
 3. ${reportProgressInstruction}

modes.ts

@@ -50,7 +50,7 @@ export function computeModes(): Mode[] {
 8. ${reportProgressInstruction}
 
 9. Determine whether to create a PR (if not already on a PR branch):
-   - **Default behavior**: Create a PR using ${ghPullfrogMcpName}/create_pull_request with an informative title and body. If relevant, indicate which issue the PR addresses (e.g. "Fixes #123").
+   - **Default behavior**: Create a PR using ${ghPullfrogMcpName}/create_pull_request with an informative title and body. If you are working in the context of an issue (check EVENT DATA for \`issue_number\` where \`is_pr\` is not true), include "Closes #<issue_number>" in the PR body to auto-close the issue when merged.
    - **Branch-only request**: If the user explicitly asks for a branch without a PR (e.g. "don't create a PR", "branch only", "just create a branch"), do NOT create a PR. Simply push the branch and report the branch link.
 
 10. Call report_progress one final time ONLY if you haven't already included all the important information (PR links, branch links, summary) in a previous report_progress call. If you already called report_progress with complete information including PR links after creating the PR, you do NOT need to call it again. Only make a final call if you need to add missing information. When making the final call, ensure it includes:
@@ -228,7 +228,7 @@ ${permalinkTip}`,
    - Use ${ghPullfrogMcpName}/commit_files to commit your changes, then ${ghPullfrogMcpName}/push_branch to push the branch. Do NOT use git commands directly (\`git commit\`, \`git push\`, \`git checkout\`, \`git branch\`) as these will use incorrect credentials.
    - Test your changes to ensure they work correctly.
    - Determine whether to create a PR:
-     - **Default behavior**: Create a PR using ${ghPullfrogMcpName}/create_pull_request with an informative title and body. If relevant, indicate which issue the PR addresses (e.g. "Fixes #123"). Include links to the issue or comment that triggered the PR in the PR body.
+     - **Default behavior**: Create a PR using ${ghPullfrogMcpName}/create_pull_request with an informative title and body. If you are working in the context of an issue (check EVENT DATA for \`issue_number\` where \`is_pr\` is not true), include "Closes #<issue_number>" in the PR body to auto-close the issue when merged.
      - **Branch-only request**: If the user explicitly asks for a branch without a PR (e.g. "don't create a PR", "branch only", "just create a branch"), do NOT create a PR. Simply push the branch and report the branch link.
 
 3. ${reportProgressInstruction}