fix(providers): honour Ollama private-network default during discovery

[Wibias]

Summary

Fixes #758

Honours Ollama private-network default during provider discovery.

Security

Destination-policy wiring only; registry defaults only; metadata/link-local still denied.

Test plan

• CI green
• Regression tests for discovery policy

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Review details

⚙️ Run configuration

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Run ID: 09ab76c6-8eef-4937-a65f-a0869b8e7bc5

📥 Commits

Reviewing files that changed from the base of the PR and between be177ea and 51f9546.

📒 Files selected for processing (3)

• src/lib/destination-policy.ts
• src/lib/provider-outbound.ts
• tests/provider-outbound.test.ts

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[Wibias]

[shipping-github] Merge-ready

• \mergeStateStatus: CLEAN (duplicate workflow run reconciled; both \windows-latest\ checks success on HEAD \51f95463)
• Full cross-platform matrix + enforce-target + react-doctor green
• Earlier windows failures were runner flakes (\�xecuteArchivedCleanup\ timeouts / Bun panic), not branch regressions

[Wibias]

Verdict: approve-comment

• Usefulness: Fixes Bug: Ollama provider discovery is blocked by destination policy in OpenCode 2.7.43 #758 — discovery honours registry allowPrivateNetworkByDefault (Ollama).
• Bugs: none.
• Security: intentional narrow private-network allowance for registry-default local providers; not a general SSRF bypass.
• Owner/maintainer reviews: none.
• Bots: clear.
• Base / CI: green.
• Gate: none.