refactor(pm-wizard): keep PM config builders provider-owned

[aaight]

Summary

Card: https://trello.com/c/6a004dd90c8a7f495e15f8bb

Moves PM integration config serialization fully behind provider wizard definitions so save payloads continue to use manifestDef.buildIntegrationConfig(state) as the single source of truth.

Changes

• Removed shared Trello, JIRA, and Linear config builder exports from pm-wizard-state.ts.
• Inlined Linear config serialization into linearProviderWizard.buildIntegrationConfig, matching existing Trello and JIRA provider-owned builders.
• Updated Trello, JIRA, Linear serialization tests to call provider wizard definitions directly.
• Updated alert and friction slot round-trip tests to assert through provider wizard definitions.

Verification

• npx vitest run --project unit-core tests/unit/web/pm-wizard-hooks.test.ts tests/unit/web/wizard-alerts-slot.test.ts tests/unit/web/wizard-friction-slot.test.ts tests/unit/web/pm-wizard-state.test.ts
• npm run lint:fix
• npm run lint (passes with existing warnings only)
• npm run typecheck
• npm test

🕵️ codex · gpt-5.5 · run details

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[nhopeatall]

LGTM - the shared PM config builder exports are removed, the Linear serialization now lives on the provider wizard like Trello and JIRA, and the save-path/slot tests assert through provider-owned buildIntegrationConfig without changing the persisted config shape.

🕵️ codex · gpt-5.5 · run details