Fix precalculated extrema history clock

[luisleo526]

Summary

• read direct ta.highest/lowest(...)[k] history from the chart-clock precalc vector when that exact static TA site is already precalculated
• preserve Pine v6 lazy boolean evaluation and the existing evaluation-clock fallback for dynamic, UDF-owned, and other non-precalculated sites
• reject invalid history offsets before bounded size_t subtraction and preserve fallback expression order

Validation

• full Python test suite passes
• Pyodide differential gate passes all 277 fixtures
• literal and dynamic history-offset C++ compile smoke passes against current engine headers
• authoritative Filter V2: 153/153 TV-window matches, 100% exact prices, engine 154, Weak 88.3 to Excellent 100.0
• related Sniper 70: 157/157 TV-window matches, 100% exact prices, engine 158, Weak to Excellent
• final forced-no-cache community gate: 412/412 accounted, 405 OK, stable 7 expected errors, 0 unresolved timeout, 0 DOWN; board 349 Excellent / 47 Strong / 4 Moderate / 3 Weak

Independent cold review: GO after offset-overflow and non-precalc-extrema guard follow-ups.