fix: raise inotify limits to prevent gateway EMFILE crashes

[KrasimirKralev]

Problem (#160)

The OpenClaw gateway runs several file watchers — skills/workspace, config reload, MEMORY.md. On Jetson the stock inotify ceilings are low (max_user_instances=128, max_user_watches=65536), and under load they exhaust → EMFILE: too many open files during watch setup, which crashes the gateway and drives a restart loop (the reporter saw NRestarts=8 + dbus-daemon: Cannot initialize inotify).

There was no inotify tuning anywhere in scripts//install.sh.

Fix

setup-optimizations.sh now persists higher limits via /etc/sysctl.d/99-clawbox-inotify.conf (instances 512, watches 524288) and applies them. The apply is best-effort and guarded (|| true) so it can't fail the install inside the e2e-install container where /proc/sys is read-only.

Verification

• bash -n clean.
• Applied on a real Jetson: limits raised 128 → 512 and 65536 → 524288. (The live box was at 42/128 instances at idle — now mitigated.)

Note: this is the device-side mitigation; the watcher-count root cause is upstream OpenClaw.

Closes #160

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 7f57229 and f4f17a7.

📒 Files selected for processing (1)

• scripts/setup-optimizations.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/jetson-inotify-limits

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[github-actions]

CI Summary

✅ Tests

• Result: passed
• View run
• Coverage: statements 69.17%, branches 59.07%, functions 64.01%, lines 71.22%

✅ E2E

• Result: passed
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✅ E2E Install

• Result: success
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