v4.0.0-alpha.49

What's Changed

• chore(deps-dev): bump the npm group with 4 updates by @dependabot[bot] in #218
• Add explainer.html documentation file by @pacphi in #219
• fix(usage): count each Claude API message once, not once per transcript line by @pacphi in #220
• fix(usage): correct Codex usage attribution (subagents, imports, restarts, oversized rollouts) by @pacphi in #221
• feat(usage): observe Claude context window via the statusline ledger; split main vs subagent Context by @pacphi in #222
• fix(usage): OpenCode usage fidelity (reasoning, cache key, latency, aborts, local pricing) by @pacphi in #223
• fix(brain): qualify the reviewed 4.3.26 lifecycle hook contract by @pacphi in #224

Full Changelog: v4.0.0-alpha.48...v4.0.0-alpha.49