Sync upstream v1.14.31 (catch-up sprint #2)

[yeighta]

Goal

dev を upstream v1.4.14 (前回 catch-up 着地点) から v1.14.31 まで進める。

Scope

• 510 commits / 16 release tags
• 29 conflicts を解消済（merge commit ae4fcf268）
• 928 files changed (+55600 / -21746)

主な upstream 構造変更

• packages/shared → packages/core rename (refactor: rename shared package to core #24309)
• packages/opencode/src/global/index.ts → packages/core/src/global.ts
• packages/opencode/test/session/prompt-effect.test.ts 削除 (test(opencode): consolidate session prompt tests into Effect style #23710)
• tool runner (tool.ts) が decoded result を execute に正しく渡すよう修正（我々の Theme B 修正は obsolete）

Codemod 更新

• script/rebrand.ts の app = "securecode" rule を packages/core/src/global.ts へ retarget
• 既存 45 ルールは all already-applied として通過

Acceptance criteria

• merge conflicts 解消（29 件）
• codemod re-applied（46 ルール idempotent）
• bun typecheck: 13/13 packages pass
• CI green (test.yml on linux + windows)
• PR review + merge

関連

• Catch-up sprint feat: compact and other improvements #1: [beta] process freezes after typing "/" #91 (v1.2.27 → v1.4.14)
• Umbrella tracking: string/blob arg as context support #92

[yeighta]

Wrong repo, closing immediately. Intended for acompany-develop/securecode (downstream fork).

[github-actions]

This issue doesn't fully meet our contributing guidelines.

What needs to be fixed:

• No issue template was used. All issues must use one of the three templates: Bug Report, Feature Request, or Question
• This appears to be an internal project management/task tracking entry rather than a bug, feature request, or question — such tracking items should use the appropriate template or be handled via pull requests/project boards instead

Please edit this issue to address the above within 2 hours, or it will be automatically closed.

---

This issue might be a duplicate of existing issues. Please check:

• chore: sync upstream v1.3.16 #21158: Similar upstream sync tracking issue ("chore: sync upstream v1.3.16")

If you believe this was flagged incorrectly, please let a maintainer know.