feat(formatters): render all terminal output via marked-terminal

Add marked-terminal as the rendering engine for all human-readable CLI output.
All detail views (issue, event, org, project, log, trace, Seer) now build
markdown internally and render through marked-terminal, producing Unicode
box-drawing tables and styled headings. Streaming list output (log/trace rows)
stays row-by-row for compatibility with follow/watch modes.

- Add src/lib/formatters/markdown.ts with central renderMarkdown() utility
- Rewrite formatters to return rendered string instead of string[]
- Convert all detail sections to markdown tables (| **Label** | value | pattern)
- Convert Seer root cause and solution output to fenced code blocks
- Remove divider(), formatTable() dead code from human.ts
- Escape SDK names in code spans to prevent markdown transformation of underscores
- Update all formatter tests for new string return type and content-based checks

Author: BYK

AGENTS.md

@@ -34,6 +34,7 @@
     "@stricli/auto-complete": "^1.2.4",
     "@stricli/core": "^1.2.4",
     "@types/bun": "latest",
+    "@types/marked-terminal": "^6.1.1",
     "@types/node": "^22",
     "@types/qrcode-terminal": "^0.12.2",
     "@types/semver": "^7.7.1",
@@ -63,5 +64,9 @@
   "packageManager": "bun@1.3.9",
   "patchedDependencies": {
     "@stricli/core@1.2.5": "patches/@stricli%2Fcore@1.2.5.patch"
+  },
+  "dependencies": {
+    "marked": "^15",
+    "marked-terminal": "^7.3.0"
   }
 }

bun.lock

@@ -54,11 +54,7 @@ type HumanOutputOptions = {
 function writeHumanOutput(stdout: Writer, options: HumanOutputOptions): void {
   const { event, detectedFrom, spanTreeLines } = options;
 
-  const lines = formatEventDetails(event, `Event ${event.eventID}`);
-
-  // Skip leading empty line for standalone display
-  const output = lines.slice(1);
-  stdout.write(`${output.join("\n")}\n`);
+  stdout.write(`${formatEventDetails(event, `Event ${event.eventID}`)}\n`);
 
   if (spanTreeLines && spanTreeLines.length > 0) {
     stdout.write(`${spanTreeLines.join("\n")}\n`);

package.json

@@ -107,8 +107,7 @@ export const explainCommand = buildCommand({
       }
 
       // Human-readable output
-      const lines = formatRootCauseList(causes);
-      stdout.write(`${lines.join("\n")}\n`);
+      stdout.write(`${formatRootCauseList(causes)}\n`);
       writeFooter(
         stdout,
         `To create a plan, run: sentry issue plan ${issueArg}`

src/commands/event/view.ts

@@ -35,7 +35,6 @@ import {
   ValidationError,
 } from "../../lib/errors.js";
 import {
-  divider,
   type FormatShortIdOptions,
   formatIssueListHeader,
   formatIssueRow,
@@ -118,7 +117,7 @@ function writeListHeader(
 ): void {
   stdout.write(`${title}:\n\n`);
   stdout.write(muted(`${formatIssueListHeader(isMultiProject)}\n`));
-  stdout.write(`${divider(isMultiProject ? 96 : 80)}\n`);
+  stdout.write(muted(`${"─".repeat(isMultiProject ? 96 : 80)}\n`));
 }
 
 /** Issue with formatting options attached */

src/commands/issue/explain.ts

@@ -125,8 +125,7 @@ function outputSolution(options: OutputSolutionOptions): void {
   }
 
   if (solution) {
-    const lines = formatSolution(solution);
-    stdout.write(`${lines.join("\n")}\n`);
+    stdout.write(`${formatSolution(solution)}\n`);
   } else {
     stderr.write("No solution found. Check the Sentry web UI for details.\n");
   }

src/commands/issue/list.ts

@@ -57,17 +57,13 @@ type HumanOutputOptions = {
 function writeHumanOutput(stdout: Writer, options: HumanOutputOptions): void {
   const { issue, event, spanTreeLines } = options;
 
-  const issueLines = formatIssueDetails(issue);
-  stdout.write(`${issueLines.join("\n")}\n`);
+  stdout.write(`${formatIssueDetails(issue)}\n`);
 
   if (event) {
     // Pass issue permalink for constructing replay links
-    const eventLines = formatEventDetails(
-      event,
-      "Latest Event",
-      issue.permalink
+    stdout.write(
+      `${formatEventDetails(event, "Latest Event", issue.permalink)}\n`
     );
-    stdout.write(`${eventLines.join("\n")}\n`);
   }
 
   if (spanTreeLines && spanTreeLines.length > 0) {

src/commands/issue/plan.ts

@@ -92,8 +92,7 @@ function writeHumanOutput(
   orgSlug: string,
   detectedFrom?: string
 ): void {
-  const lines = formatLogDetails(log, orgSlug);
-  stdout.write(`${lines.join("\n")}\n`);
+  stdout.write(`${formatLogDetails(log, orgSlug)}\n`);
 
   if (detectedFrom) {
     stdout.write(`\nDetected from ${detectedFrom}\n`);

src/commands/issue/view.ts

@@ -15,7 +15,6 @@ import { openInBrowser } from "../../lib/browser.js";
 import { buildCommand } from "../../lib/command.js";
 import { AuthError, ContextError } from "../../lib/errors.js";
 import {
-  divider,
   formatProjectDetails,
   writeJson,
   writeOutput,
@@ -183,13 +182,11 @@ function writeMultipleProjects(
     const target = targets[i];
 
     if (i > 0) {
-      stdout.write(`\n${divider(60)}\n\n`);
+      stdout.write(`\n${"─".repeat(60)}\n\n`);
     }
 
     if (project) {
-      const details = formatProjectDetails(project, dsn);
-      stdout.write(details.join("\n"));
-      stdout.write("\n");
+      stdout.write(`${formatProjectDetails(project, dsn)}\n`);
       if (target?.detectedFrom) {
         stdout.write(`\nDetected from: ${target.detectedFrom}\n`);
       }