Bump better-sqlite3 from ^11.0.0 to ^12.4.5 (Node 25 support)

[Copilot]

better-sqlite3@^11 (resolves to 11.10.0) has no Node 25 prebuilts and fails source compilation due to V8 API changes (v8-object.h errors). Node 25 support was added in v12.4.5 via WiseLibs/better-sqlite3#1411 and #1422.

Changes

• package.json: "better-sqlite3": "^11.0.0" → "^12.4.5"
• CHANGELOG.md: entry under [Unreleased]

Original prompt

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This section details on the original issue you should resolve

<issue_title>npm install fails on Node 25: better-sqlite3 ^11 needs bump to ^12.4.5+</issue_title>
<issue_description>### Environment

• OS: macOS arm64 (Darwin 23.6.0)
• Node: v25.6.1 (Homebrew)
• qmd: 1.0.7

Problem

npm install -g @tobilu/qmd fails on Node 25 because qmd pins better-sqlite3@^11.0.0 (resolves to 11.10.0), which has no Node 25 prebuilt binaries and fails source compilation due to V8 API changes:

v8-object.h:957:37: error: expected expression
    I::ReadExternalPointerField<{internal::kFirstEmbedderDataTag,

Root cause

better-sqlite3 added Node 25 support (prebuilds + engines) in v12.4.5 (WiseLibs/better-sqlite3#1411, WiseLibs/better-sqlite3#1422). QMD's package.json pins ^11.0.0 which caps the resolved version at 11.10.0.

Proposed fix

Bump better-sqlite3 dependency from ^11.0.0 to ^12.4.5 in package.json.

Workaround

Running qmd via Node 22 wrapper:

#!/usr/bin/env bash
exec /opt/homebrew/opt/node@22/bin/node \
  /opt/homebrew/lib/node_modules/@tobilu/qmd/dist/qmd.js "$@"

Notes

• qmd declares engines: { node: ">=22.0.0" } which includes Node 25, but the dependency graph doesn't support it
• Related: Windows ARM64 + Node 25: qmd embed fails due to node-llama-cpp CUDA build + sqlite-vec unavailable #222 (Windows ARM64 + Node 25)</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes npm install fails on Node 25: better-sqlite3 ^11 needs bump to ^12.4.5+ #257

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