tip: default omitted model tools capability (#50702)

[kvnloo]

Tip leaf (fork-only) — CLEAN

Maps to work-order issue #164. Upstream origin anomalyco#50702 (not touched / not promoted).

What: Default omitted model tools capability to false so configured providers do not inherit an undefined tools flag.

Commit: a50a7674ccb74eb8c0c335c8cdaf236f1387a47f
Origin tip SHA: 21728771f202689abdb98c0f8942913ce9654a48

Proof: fail→pass on packages/core/test/config/provider.test.ts filter defaults configured model tool capability to false when omitted (GREEN 1 / NEG 1 fail / RESTORE 1).

github_writes_origin: 0. Codex promote parked.

[github-actions]

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[github-actions]

Hey! Your PR title tip: default omitted model tools capability (#50702) doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[kvnloo]

READY_UPSTREAM

Rechecked before promotion:

• upstream PR fix(config): default omitted model tools capability anomalyco/opencode#50702 is open
• current upstream head exactly matches Grok's tested tip: 21728771f202689abdb98c0f8942913ce9654a48
• no prior kvnloo validation comment is present
• fail → pass → restore evidence in this fork PR applies to that exact head

Use local gh/Hermes to post the validation note upstream; the ChatGPT GitHub App gets 403 on anomalyco/opencode. Do not open a duplicate PR.