fix(formatters): fix HTML entities and escaped underscores in table output

[betegon]

Summary

Fixes two rendering bugs introduced in efb59ba (the markdown rendering pipeline):

1. <unknown> displays as <unknown> — escapeMarkdownInline used HTML entities to escape angle brackets, but marked keeps them as-is in text tokens, so they showed up literally in terminal output.
2. /_astro/ displays as /\_astro/ — escaped underscores in URLs got captured by GFM autolink detection, which doesn't process backslash escapes, leaving the backslash visible.

Changes

• escapeMarkdownInline / escapeMarkdownCell: use CommonMark backslash escapes (\</\>) instead of HTML entities. marked correctly parses these as escape tokens with the decoded character.
• renderOneInline link case: detect GFM autolinks via link.raw (starts with URL scheme, not [) and strip backslash-escape artifacts from both link text and href.
• Tests: added angle bracket escape tests for both functions, plus round-trip tests verifying <unknown> and URLs with underscores render correctly through the full pipeline.

Test plan

• bun test test/lib/formatters/markdown.test.ts — 77 tests pass (3 new)
• Manual: bun src/bin.ts issue list against projects with <unknown> titles and URL-containing titles

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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Entries from this PR are highlighted with a left border (blockquote style).

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New Features ✨

• (formatters) Render all terminal output as markdown by BYK in #297
• (issue-list) Global limit with fair distribution, compound cursor, and richer progress by BYK in #306

Bug Fixes 🐛

Api

• Use limit param for issues endpoint page size by BYK in #309
• Auto-correct ':' to '=' in --field values with a warning by BYK in #302

Other

• (ci) Generate JUnit XML to silence codecov-action warnings by BYK in #300

• (formatters) Fix HTML entities and escaped underscores in table output by betegon in #313

• (nightly) Push to GHCR from artifacts dir so layer titles are bare filenames by BYK in #301
• (test) Handle 0/-0 in getComparator anti-symmetry property test by BYK in #308

Internal Changes 🔧

• (api) Wire listIssuesPaginated through @sentry/api SDK for type safety by BYK in #310

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[github-actions]

Codecov Results 📊

✅ 2272 passed | Total: 2272 | Pass Rate: 100% | Execution Time: 0ms

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +4
Passed Tests	📈 +4
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 3233 uncovered lines.
✅ Project coverage is 80.08%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
markdown.ts	89.63%	⚠️ 34 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    80.05%    80.08%    +0.03%
==========================================
  Files          120       120         —
  Lines        16218     16226        +8
  Branches         0         0         —
==========================================
+ Hits         12983     12993       +10
- Misses        3235      3233        -2
- Partials         0         0         —

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