[R-101] review-only

[yzsnstotz]

Changes

• Memoize Meridian configuration on first property access while preserving the existing config export contract.
• Keep caller identity and model catalog initialization off configuration-free CLI paths.
• Add package.json-backed --version output and advertise it in --help.
• Add empty-environment positive and negative regression coverage.

Deletions Claimed

None.

Validation

• Node 22 empty-environment identity regression tests: 4 passed.
• Existing CLI and configuration focused suites: 43 passed.
• npm run typecheck
• focused ESLint on all touched TypeScript files
• npm run build
• Compiled env -i probes: --version exit 0, --help exit 0, hub entry exit 1 with TELEGRAM_BOT_TOKEN and ALLOWED_USER_IDS named.
• Full suite has four baseline-identical host-sensitive failures, reproduced on untouched origin/main: monitor logger exit race plus three CLI resolver assertions that discover /opt/homebrew/bin/codex.

Review-only; not merged. No running Meridian process was restarted, stopped, or hot-updated.