Add label.set_text_font_family, label.set_text_formatting and label.new text_formatting

[lenstrats]

Problem

label.set_text_font_family() and label.set_text_formatting() cannot be called from scripts. LabelHelper has no namespace-level setters for them, and Context does not bind them. (LabelObject did have set_text_font_family, but only as a method.) label.new() also ignores the v6 text_formatting argument.

//@version=6
indicator("repro", overlay = true)
if barstate.islast
    l = label.new(bar_index, high, "x", text_formatting = text.format_bold)
    label.set_text_font_family(l, font.family_monospace)
plot(close)

→ TypeError: label.set_text_font_family is not a function

This script compiles on TradingView. 7 of 729 popular open-source indicators failed on this.

Fix

This mirrors the existing box implementation:

• Add set_text_font_family and set_text_formatting to LabelHelper, and bind them in Context.
• Store text_formatting on LabelObject (constructor, copy() and toPlotData()). The default is "none", matching text.format_none.
• Accept text_formatting in label.new(), both positionally (after force_overlay) and as a named argument.
• Route the LabelObject method delegates through the helper, like the other setters.
• Update the API coverage docs (label.md, pinescript-v6/label.json).

Tests

• tests/namespaces/label/label.test.ts: the two setters, plus a native Pine script covering text_formatting in label.new(), method-call syntax and label.copy(). The Pine script compiles on TradingView.
• The new tests fail on dev (label.set_text_font_family is not a function) and pass with this change. Full suite: 1840 passed, 5 skipped, 16 todo.
• Real indicators: 5 of the 7 affected indicators now run without errors. The other 2 stop at unrelated issues.
• Differential check: all 729 indicators were run on identical cached market data within the same clock hour, once against dev and once against this branch. 5 now run without errors. 2 get past the missing setter and then stop at other unsupported features. No regressions. The only changed output values are in 6 scripts that use timenow or math.random; their output also differs between two identical dev runs. Output was compared with the text_formatting key left out, because this change adds that key to every label.

The repro scripts and tooling are in https://github.com/lenstrats/pinets-compat.

🤖 Generated with Claude Code

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[lenstrats]

recheck