fix(router): tell provideRouter from forRoot without the router util

[erkamyaman]

What and why

Part of #100. ng.ɵgetRouterInstance only exists from @angular/router 20.3.5. #185 already made routerOf() in the Analog runtime fall back to the injector, and made the setup kind unknown on older versions. But that meant every app on 20.0 to 20.3.4 showed unknown, even though the providers tell the two setups apart.

• router-setup.ts: when the util is missing, the setup kind comes from the root providers. The RouterModule.forRoot guard token means forRoot or other, the ROUTES token without that guard means provideRouter, and only when neither is found is it unknown. The providers are read once and reused for the initial navigation mode.
• router-config tool description, inspectors/router.md and agents/tools.md list the three values and explain the fallback.

Refs #100

How it was verified

• pnpm commit:check, pnpm format:check, pnpm typecheck, pnpm skills:check
• pnpm test:devtools (1169) and pnpm test:panel
• pnpm docs:build, pnpm test:axe
• New router-setup-legacy.test.ts: a real provideRouter app with the util removed and ng-version 20.3.4 is detected as provideRouter, findRouter and the Analog routerOf still find the router, and no providers gives unknown. router-forroot.test.ts now expects forRoot or other on every version.

Notes for reviewers

The tests run on Angular 22 with the util removed, not a real 20.x install. Left for a decision in #100: a CI matrix for Angular 20, 21 and 22 and Node 22, raising the @angular/core peer floor to 20.3.5, upper bounds on the peer ranges, and a tested-versions list in the docs.

Summary by CodeRabbit

• Bug Fixes
  • Improved router setup detection across Angular versions, including older releases and configurations where setup details cannot be determined.
  • Router diagnostics now distinguish provideRouter, forRoot or other, and unknown setups based on available router information.
  • Router discovery continues to work in legacy configurations where the usual Angular router utility is unavailable.

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📒 Files selected for processing (2)

• packages/devtools/src/__tests__/router-setup-legacy.test.ts
• packages/devtools/src/router-setup.ts

🚧 Files skipped from review as they are similar to previous changes (2)

• packages/devtools/src/router-setup.ts
• packages/devtools/src/tests/router-setup-legacy.test.ts

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📝 Walkthrough

Walkthrough

Router setup detection now uses router utilities, provider tokens, and Angular version data to classify setup. Tests and documentation cover provideRouter, forRoot or other, and unknown.

Changes

Router setup classification

Layer / File(s)	Summary
Classify and describe router setup packages/devtools/src/router-setup.ts, packages/devtools/src/__tests__/router-setup-legacy.test.ts, packages/devtools/src/__tests__/router-forroot.test.ts, packages/devtools/src/devframe.ts, apps/docs/src/content/agents/tools.md, apps/docs/src/content/inspectors/router.md	detectSetup classifies setup using router utilities, provider tokens, and Angular version data. Tests cover router lookup without ɵgetRouterInstance and setup classifications. Tool and inspector descriptions document the setup kinds.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to fc939

No actionable issue remains from the reviewed router setup changes; the PR is mergeable after normal checks.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: detecting whether an app uses provideRouter or forRoot when the router utility is unavailable.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Inline comments:
Review comments at @packages/devtools/src/router-setup.ts:
- Around line 138-139: In the router setup classification, check provider
descriptions before applying the version fallback: return “forRoot or other”
when the duplicate forRoot guard is present, then return “provideRouter” when
ROUTES is present, and only then use publishesRouterUtil(version) before falling
back to “unknown”.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 959ca575-40ad-4f84-8a77-de305ab31bc2

📥 Commits

Reviewing files that changed from the base of the PR and between 3255b06 and 280bc59.

📒 Files selected for processing (6)

• apps/docs/src/content/agents/tools.md
• apps/docs/src/content/inspectors/router.md
• packages/devtools/src/__tests__/router-forroot.test.ts
• packages/devtools/src/__tests__/router-setup-legacy.test.ts
• packages/devtools/src/devframe.ts
• packages/devtools/src/router-setup.ts

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