perf: visibility-gate dashboard render loop

Co-authored-by: PR0M3TH3AN <[email protected]>

src/todo/TODO_2026-02-16.md

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+# TODO: perf-agent (2026-02-16)
+
+- [ ] Create context file.
+- [ ] Run grep searches.
+- [ ] Create hits file.
+- [ ] Implement visibility gating in `dashboard/index.html`.
+- [ ] Document decisions.
+- [ ] Create test logs.
+- [ ] Create daily report.
+- [ ] Commit and push.