Release v0.19.0: /docs nav + on-site sessions browser
VERSION + CHANGELOG bump for roadmap item #30. The frontend package.json was bumped alongside the frontend slice; this commit finalizes the canonical VERSION at 0.19.0 and prepends the v0.19.0 CHANGELOG entry with the operator upgrade-steps block (OHM_SESSION_HISTORY_RAW_BASE + the two TTL knobs; all MAY) and the note about graceful degradation when the session-history repo is still flat at deploy time (subsession 0017.2 ships the restructure in parallel). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Ben Stull