Fix scale and settlement_as_close namespaces not resolving in scripts

[lenstrats]

Problem

scale and settlement_as_close are defined in src/namespaces/Types.ts, spread into the context, and listed as supported in docs/api-coverage/types.md. They are missing from CONTEXT_PINE_VARS, though, so the transpiler never binds them. Any script that uses them fails:

//@version=6
indicator("repro", scale = scale.right)
plot(close)

→ ReferenceError: scale is not defined

This script compiles on TradingView. I ran 729 popular open-source indicators from TradingView through PineTS, and 12 of them failed on this.

Fix

• Add scale and settlement_as_close to CONTEXT_PINE_VARS.
• Add both to NAMESPACE_COLLISION_NAMES. Scripts often declare their own scale variable next to indicator(scale = scale.left), which TradingView allows.

Tests

• tests/namespaces/constants.test.ts: the values of scale.* and settlement_as_close.*.
• tests/transpiler/namespace-identifier-collision.test.ts: indicator(scale = scale.none) with overlay = true, and a user variable named scale. Both scripts compile on TradingView.
• The 4 new tests fail on dev (scale is not defined) and pass with this change. Full suite: 1842 passed, 5 skipped, 16 todo.
• Differential check: all 729 indicators were run on identical cached market data, once against dev and once against this branch. 8 now run without errors. 4 get past scale and then stop at other unsupported features. The other scripts show no regressions and no changed output values. 8 scripts give different output on two identical dev runs, so I left them out of the value comparison.

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

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[baslentfert]

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