chore(release): v2.0.0

[romgrk]

v2.0.0

Release PR bumping node-gtk to 2.0.0. Major version because 64-bit integers are now marshalled as BigInt.

Note

Depends on #390 (callback executable-trampoline fix) being merged before release. That fix already landed on master via #427.

Changes in this PR

• Bump version to 2.0.0 in package.json / package-lock.json
• Add the v2.0.0 section to CHANGELOG.md covering everything since v1.0.0

Breaking

• 64-bit integers marshalled as BigInt instead of Number to preserve precision above Number.MAX_SAFE_INTEGER (Fix introspected (u)int64 types to use BigInt #323, Support BigInt conversion #149). Covers gint64/guint64, LP64 glong/gulong/gsize/gssize, and GType. Input still accepts both Number and BigInt; reads of 64-bit values now return BigInt.

Features

• TypeScript type generation via node-gtk gen-types (feat: TypeScript types via node-gtk gen-types (in-package generator) #428)
• gi.getGType() (Public API to get GType of GObject / GBoxed classes #286)
• camelCase constructor property names (Multi-word constructor props should be camelCase, not snake_case #320)
• JS array → GPtrArray IN/inout marshalling (GPtrArray IN/Inout marshalling unimplemented (abort at value.cc:823 'code should not be reached') #401)
• JS array ↔ GStrv property conversion (Boxed: GStrv conversion from GValue not working #175)

Fixes

Callback exec-trampoline segfault (#390), GValue unbox abort (#389), union OOB at offset 0 (#376), boxed g_slice/g_boxed_free mismatch (#290, #213), transfer-full IN double free (#409), signal (out)/(inout) params (#405), callee-freed container walk (#399), array-of-GValue stack overflow (#398), NULL GHashTable out-param (#400), array-of-structs by value (#404), integer-keyed GHashTable IN (#402), unknown construct prop name (#320), boxed double-free via _free/_unref (#429), nine full-source-review bugs (#395). This PR also splits the install/build guide into doc/installation.md.

Release checklist

• Segfault when using callbacks in Ubuntu 26.04 #390 merged
• CI green
• Merge, then tag v2.0.0 and publish binaries ([publish binary])

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