Add testfol.io tactical backtester domain skill

[robert7800787-hue]

Adds a domain skill for testfol.io (portfolio & tactical allocation backtester) under domain-skills/testfol/, so the harness auto-surfaces it on goto() of any testfol.io URL.

What it captures (durable site shape, not run narration)

• Two tools + share links: / (main, static portfolios) vs /tactical (signal-driven), and the ?s=<id> share-link read path that auto-renders results.
• Synthetic LETF params: TICKER?L=&E=&SW=&SP= and the *SIM preset tickers (SPYSIM, GLDSIM, KMLMSIM, DBMFSIM, …) for long history. Window auto-clips to the latest ticker inception.
• Tactical semantics: top Trading Frequency = switch cadence (not per-allocation Rebalance); left→right clause precedence; Use total return defaults on.
• Automation traps (the time-sinks): there are two BACKTEST buttons — only the 2nd recomputes; Quasar autocomplete tickers commit only via type + click-option (setting .value silently reverts); autocomplete lists the *SIM preset first; and the exec-scope closure quirk when driving multi-step builds.

All hard-won from a real session driving the tactical tool. No pixel coordinates, secrets, or run-specific data — just the map.

🤖 Generated with Claude Code

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Summary by cubic

Adds a domain skill for testfol.io (portfolio and tactical backtester) under domain-skills/testfol/, so the harness auto-surfaces guidance on goto() and can reliably read tactical results via share links.

• New Features
  • Auto-surfaces on goto() of any testfol.io URL.
  • Documents the ?s= share-link flow to auto-render and scrape results (tables and CSV).
  • Covers synthetic LETF ticker params (L/E/SW/SP) and *SIM preset tickers with start-date clipping behavior.
  • Clarifies tactical semantics (switch cadence vs rebalance, left→right clause order, total-return default) and key automation traps (use the second BACKTEST button; Quasar autocomplete requires type+click; *SIM options appear first; practical waits).

^{Written for commit 43be1b6. Summary will update on new commits.}

[browser-harness-review]

✅ Skill review passed

Reviewed 1 file(s) — no findings.

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}