Retire live model workflow E2E harnesses

[Open-Squilla]

Scope

Retire the opt-in live model workflow E2E harnesses and their dedicated regression tests, coordinators, fault proxy, and browser driver. Remove the model-backed Gateway/search workflow steps and the live branches of the router and meta-skill validation scripts.

Preserve the three deterministic document Workbench flows in an offline test module. Their extracted helper accepts only a loopback provider and synthetic credentials. Update the desktop runner, Windows test inventory and balancing metadata, and contributor guidance to match.

Scope boundary: test infrastructure, CI metadata, and documentation.

Non-goals: product runtime changes; removal of standalone provider smoke tests, model evaluations, Telegram delivery checks, search-provider checks, or deterministic browser/desktop tests.

Branch

Base branch: main

Target exception: N/A

Issue

Linked issue: None

If None, reason: test infrastructure maintenance.

Release Note

Release note: NONE — no shipped behavior changes.

Tests

Ruff: all changed Python files passed.

Pytest: 304 passed, 1 skipped across the CI planner/workflow/shard, script, documentation, and public-release hygiene tests. Preserved offline Workbench flows: 2 passed, 1 skipped. Full collection: 26,034 tests collected successfully.

Build: not run; no runtime or frontend implementation changes. Full-suite execution and Linux/Windows runtime acceptance were not performed locally.

Regression tests: updated; preserve all three offline Workbench scenarios and their existing assertions. Make the CI planner regression use an isolated dependency fixture.

Notes: validated after rebasing onto current main and installing its two new locked dependencies. Existing skips require an xdist worker and hydrated Router Git LFS model assets respectively. Node syntax and diff whitespace checks passed. Windows balancing guardrails and retained historical duration values are unchanged.

The default test path remains offline, deterministic, credential-free, and safe for forks.

Maintainer Live Check

Maintainer live check: no

Surface: N/A

No real model API calls were made. Retiring these harnesses removes their manual full-flow evidence for real-provider routing, long tasks, recovery, skill generation, document editing, and search. The remaining provider smoke tests do not replace that coverage.

Safety

No product source, persisted configuration, database migration, or public client contract changes; no upgrade migration is required. The offline helper preserves portable child-process isolation, but only macOS loopback execution was verified locally. No secrets, runtime transcripts, private material, generated assets, or machine-specific paths are included.

Third-Party Origin

Third-party origin: none

Documentation Changes

• Links and commands refer to retained repository functionality.
• Examples contain no real secrets, local private paths, or private transcripts.