Fix triaged TPS meter issue batch

[devinoldenburg]

This PR resolves the actionable issue-triage batch across core measurement, formatting, config, installer, package, documentation, and CI/runtime verification.

Every remaining open start-of-task issue is intentionally linked here and will close on merge:
Fixes #1
Fixes #2
Fixes #3
Fixes #4
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Fixes #31
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Fixes #69
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Fixes #72
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Fixes #107
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Fixes #135
Fixes #136
Fixes #138
Fixes #139

Verification performed locally:

• installer plugin spec regression (new installs write /tui; legacy root/tuple entries migrate or uninstall cleanly)
• npm test (71/71 passing)
• npx tsc --noEmit
• node tools/demo.mjs --ci
• npm run pack:check
• npm run verify:plugin

CI/CD:

• PR Fix triaged TPS meter issue batch #141 CI is passing across Node 20.11/20/22/24 and Linux/macOS/Windows test jobs plus Bun plugin verification.

Notes:

• Adds package-lock.json for reproducible installs/audit visibility and removes the lockfile ignore rule.
• Keeps the TUI entry at ./tui while making the package root a plain Node-compatible core export.
• Installer and README now register @devinoldenburg/opencode-tps-meter/tui while keeping the package dependency on @devinoldenburg/opencode-tps-meter.
• CI now runs npm verification scripts directly, adds TypeScript checking, Node 24, OS matrix coverage, release Bun setup, and Dependabot.