Branch coverage push — ratchet threshold back to 80

[JustAGhosT]

Background

PR #520 lowered branch coverage threshold from 80% to 65% as a pragmatic unblock for dev (failing CI since 2026-04-26 / PR #503) and four downstream PRs. The lowering is transitional, not a target. This issue tracks the per-module work to ratchet branches back to 80%.

Current branch coverage by module (dev baseline, 2026-05-10)

Module	Branch %	Functions %	Largest gap
sync-guard.mjs	5%	33.3%	✅ closed by PR #519 (→ 95%)
retort-config-wizard.mjs	26.7%	40%	interactive prompt branches
init.mjs	36.9%	27.1%	preset selection + flag combos
cost-tracker.mjs	39.5%	68.8%	formatter switches, threshold checks
check.mjs	39.7%	85.7%	handler runner branches
orchestrator.mjs	42.3%	68.3%	phase transition branches
expansion-analyzer.mjs	52.2%	86.5%	scoring branches
discover.mjs	52.2%	70%	tech-stack detection branches
var-builders.mjs	58.4%	93.6%	partly closed by PR #519
synchronize.mjs	65.6%	71.4%	partly closed by PR #519

Plan — ratchet vitest.config.mjs branches threshold one level at a time

Phase	Threshold	Trigger	Modules to fix
0 (now)	65	After #520 merges	— (baseline)
1	70	After cost-tracker + check	cost-tracker.mjs, check.mjs
2	73	After init + orchestrator	init.mjs, orchestrator.mjs
3	76	After discover + expansion-analyzer	discover.mjs, expansion-analyzer.mjs
4	78	After retort-config-wizard	retort-config-wizard.mjs
5	80	After miscellaneous gap-fillers	remaining drag

Each phase: 1 PR per module, then 1 PR bumping the threshold.

Acceptance criteria

• Branch coverage threshold restored to 80 in vitest.config.mjs
• No module under 70% branches in coverage report
• CI green on dev for 2+ weeks at 80% gate

References

• PR feat(mcp): make browser/crawler MCP server conditional on project e2e + storybook config #503 — added 80/80/80 thresholds (origin of the block)
• PR test(engine): bump sync-guard + scaffold-merge coverage (incremental) #517, test(engine): raise coverage on low-covered modules to clear 80% gate #519 — sync-guard / scaffold-merge / var-builders / synchronize / scaffold-engine coverage pushes
• PR Branch coverage push — ratchet threshold back to 80 #520 — this transition (lowers thresholds to 79/65/80)

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