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build(signals): pin mangled _-prop names in a checked-in map (#4503)

* build(signals): pin mangled _-prop names in a checked-in map

terser hands out short property names in first-seen order, so one added or
renamed field reshuffled names across the prod/observe trees and moved brotli
on unrelated size scenarios. scripts/mangle-props.json seeds the shared
nameCache per tree; existing fields keep their names, new fields take unused
names, removed fields drop out. Generated from next @ 643a7a7: dist is
byte-identical.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

* build: restore the pinned mangle map on a turbo cache hit

A cache hit restored dist but not a map the build wrote back, so the next
build re-derived names the cached dist did not use.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

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Co-authored-by: Claude <noreply@anthropic.com>

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