fix(workflow): migrate legacy proxies before materializing host values

[ICOM725]

Closes #858.

Writing a declared promoted widget could materialize the host values in input order while leaving legacy proxy tuples intact. A later legacy-widget write then migrated those values in proxy order, shifting them onto other inputs.

Run the existing migration before the first host write in both slot editing paths. Operation replay keeps deterministic repair IDs and shared-definition isolation. The regression covers every write order, JSON round-trips, slot labels, API conversion, and replay. The operation contract and changelog are updated too.

Validation:

• Ubuntu / Python 3.10, with uv sync --extra dev --locked: uv run --locked --extra dev pytest --cov=comfy_cli --cov-report=xml . -v --tb=short passed (7,461 passed, 33 skipped). No test files were excluded; live E2E tests remained disabled by default.
• Ruff 0.15.15 lint and format checks, pre-commit hooks, and git diff --check passed.
• On Windows, 704 focused tests passed. The new write-order regression failed in 8 of 12 cases before the fix and passed afterward. An initial broader Windows run encountered platform/fixture failures, so the complete suite was verified on Linux as above.

No live ComfyUI server or generation was used. Thanks to @seconds-0 for the write-order analysis in #858.

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• tests/comfy_cli/command/test_workflow_edit_legacy_proxy.py

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📝 Walkthrough

Walkthrough

The change flushes pending legacy proxyWidgets migration before promoted host writes. It adds repair metadata for already-linked inputs, expands apply-time migration handling, documents the operation contract, and tests write order, reload, replay, and shared-definition behavior.

Changes

Proxy migration repair

Layer / File(s)	Summary
Pre-write proxy repair comfy_cli/workflow_ops.py, comfy_cli/cql/engine.py, docs/op-vocabulary-v1.md	set_widget now carries repair identifiers when pending proxy migration requires execution. The apply path flushes migration before writing the host value. The operation vocabulary documents this behavior for already-linked inputs.
Write-order regression coverage tests/comfy_cli/command/test_workflow_edit_legacy_proxy.py, CHANGELOG.md	Parameterized tests verify consistent values across write orders, reloads, API conversion, replay, and shared-definition forks. The changelog records the fix.

Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 2aa7d

Pending legacy proxy migrations now run before promoted widget writes, preventing widget-value shifts caused by write order. The covered ordering, reload, replay, conversion, and shared-definition cases leave no concrete current merge risk.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes address issue #858. Proxy migration now runs before host writes when pending legacy entries exist, including separate write calls. The shared slot engine covers workflow editing paths. Reg…
Out of Scope Changes check	✅ Passed	All changes support the fix: implementation updates, regression tests, operation-contract documentation, and the changelog. No unrelated code or public API changes are identified.

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Actionable comments posted: 1

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Inline comments:
In `@tests/comfy_cli/command/test_workflow_edit_legacy_proxy.py`:
- Line 279: Update the set_widget call in the workflow edit test to bind its
unused operation return value to _ instead of op, while preserving the existing
wf assignment and behavior.

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📒 Files selected for processing (5)

• CHANGELOG.md
• comfy_cli/cql/engine.py
• comfy_cli/workflow_ops.py
• docs/op-vocabulary-v1.md
• tests/comfy_cli/command/test_workflow_edit_legacy_proxy.py

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