fix(bearings): expose full truncated board text

[parjmeneses]

Summary

• expose exact native full-text titles for clipping-prone Bearings board content while preserving visible labels and wrapping
• make the Recently Landed PR-link path explicitly preserve its label, exact HTTPS href, and exact full URL title
• add deterministic headless-free renderer regressions for long, markup-like, null-safe, provenance, badge, freeform, and landed-link cases

Validation

• no-mistakes review, tests, and documentation completed on exact pipeline head 82a527fa
• pinned ShellCheck 0.11.0 and actionlint 1.7.12 passed through bin/fm-lint.sh
• pushed by no-mistakes on fresh fm/bearings-board-truncation-tooltips-r2

Supersedes #2907. This PR is intentionally not merged.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge with no actionable correctness, security, or repository-policy issues identified.

Payload validation, null-safe title assignment, URL preservation, and focused renderer regressions consistently support the intended full-text behavior.

_{Reviews (1): Last reviewed commit: "no-mistakes(document): document titledVa..." | Re-trigger Greptile}