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gsxdsm fed5d3d951 FN-7759: fix GPT-5.6 codex models missing from model dropdown

Ensure GPT-5.6 codex models (luna, sol, terra) actually surface in the codex model picker by validating the openai-codex supplemental merge against the real pi-coding-agent ModelRegistry instead of only a mocked one.

- Harden openai-models.ts supplemental merge logic against real ModelRegistry auth filtering, registerProvider full-replacement, and OAuth provider validation
- Add @earendil-works/pi-coding-agent devDependency to @fusion/core for real-registry testing
- Add regression test (openai-models.test.ts) exercising the real registry path
- Extend register-model-routes-openai-codex-supplemental.test.ts dashboard test coverage
- Update docs/settings-reference.md
- Add changeset fn-7759-codex-gpt-5-6-dropdown.md (patch, fix)

Files changed:
 .changeset/fn-7759-codex-gpt-5-6-dropdown.md       |   7 ++
 docs/settings-reference.md                         |   2 +-
 packages/core/package.json                         |   1 +
 packages/core/src/__tests__/openai-models.test.ts  |  68 +++++++++++++
 packages/core/src/openai-models.ts                 | 107 ++++++++++++++++-----
 ...-model-routes-openai-codex-supplemental.test.ts |  77 +++++++++++++--
 pnpm-lock.yaml                                     |  68 +++++++++++++
 7 files changed, 300 insertions(+), 30 deletions(-)

Fusion-Task-Id: FN-7759

Fusion-Task-Lineage: 4c03838f-b8d8-4f6f-ae55-c3356c1c3176

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-09 23:12:02 -07:00