feat: declare the fusion delegate + gap-fill its gateway (ADR 0064 P3)

[mabry1985]

What

Companion to projectBoard-plugin#64 (the board-seam fusion-rung wiring). The shipped team template now declares a real fusion delegate and wires it into project_board.coder_solve_fusion_delegate, so a team spun up from this template can actually reach rung 4 on the hardest features — not just have the board-seam machinery support it in principle.

delegates:
  - { name: fusion, type: openai, model: protolabs/fusion, url: "", api_key: "" }
project_board:
  coder_solve_fusion_delegate: fusion
  coder_solve_fusion_k: 2

Gateway inheritance, extended

url/api_key ship blank on fusion, same as the team's own model: block — so _inherit_host_gateway needed extending: it now also gap-fills any delegates: entry of type: openai with a blank url from the same host gateway the model block inherits (a per-delegate url is left alone, same discipline as a per-team model gateway). No per-team creds prep needed for fusion any more than for the team's own brain.

Docs

README's coder-ladder section gets a new "fusion" subsection: the config, and the load-bearing design constraint — fusion can't tool-call (a plain completion, not an ACP session), so the board seam hands it current file content and writes its reply's files into a fresh worktree itself.

Tests

• Shipped-template content contract extended: test_shipped_template_declares_the_fusion_delegate_gateway_blank, test_shipped_template_wires_fusion_into_the_coder_solve_ladder.
• New _inherit_host_gateway coverage: fills a blank openai-delegate url, respects a delegate's own url, leaves non-openai delegates untouched.

144 passed (was 127; +17 new/updated).

Version bumped 0.15.1 → 0.16.0 (new capability).

🤖 Generated with Claude Code

[protoquinn]

👀 Quinn is reviewing — verdict (PASS / WARN / FAIL) + findings to follow.

[protoquinn]

QA Audit — PR #36 | feat: declare the fusion delegate + gap-fill its gateway (ADR 0064 P3)

VERDICT: WARN (CI still queued — non-terminal; re-review for PASS/FAIL once checks settle)

---

CI Status

• test: queued ⏳

Diff Review

• 5 files, ~255 lines: shipped template declares fusion delegate (openai type, blank url/api_key), wires it into project_board.coder_solve_fusion_delegate, extends _inherit_host_gateway to gap-fill blank-URL openai delegates from the host gateway, updates README, bumps version 0.15.1→0.16.0.
• __init__.py:_inherit_host_gateway refactored from early-return to changed-flag pattern — the delegates loop is gated on type: openai + blank url, correctly respecting per-delegate gateways and leaving non-openai delegates untouched.
• Template YAML (langgraph-config.yaml) correctly declares fusion delegate and wires coder_solve_fusion_delegate: fusion + coder_solve_fusion_k: 2.

Observations

• LOW: Clawpatch structural review unavailable for this repo (not in project registry) — manual diff review only.
• LOW: CI test check still queued at review time; no terminal pass/fail signal yet. Submit PASS/FAIL on re-review once terminal.
• The _inherit_host_gateway early-return → changed-flag refactor is behavior-preserving for the model block and correctly additive for delegates. The _host_gateway() call moves outside the guard but is side-effect-free (env/config reads only).

— Quinn, QA Engineer

[protoquinn]

Submitted COMMENT review on #36.