docs(sdkclient): drop build-ladder references from comments

[robbycochran]

Follow-up cleanup to PR1 (SDK foundation). Rewrites comments in internal/openshell/sdkclient that referenced the implementation plan into durable, designed-today form.

Removed sediment: slice numbers (S1/S3/S4), "S3 has landed", "in S4", "see specs findings", TODO(PR8), "S1 kill-gate".

Durable facts preserved:

• The SA-OIDC dial path is untested end-to-end because no OIDC gateway is available in this environment (audience/scopes unverified).
• TestHealthE2E proves an mTLS Health().Check from within the harness module against a live gateway.

Comment-only (plus one t.Skip message reword); no behavior change. build/vet/full test suite/golangci-lint all green.

Note: "Phase 2" in cmd/doctor.go is intentionally kept — it is user-facing product vocabulary (the doctor --help documents "Phase 1 (offline)" / "Phase 2 (online)"), not a plan reference.

Summary by CodeRabbit

• Documentation
  • Clarified verification coverage for mTLS, default authentication, and service-account OIDC connections.
  • Documented that live OIDC gateway dialing remains untested.
  • Updated health check test documentation and skip messaging to reflect current verification terminology.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

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Plan: Enterprise

Run ID: 9d536151-ff5c-4f9b-a22a-b375e885a911

📥 Commits

Reviewing files that changed from the base of the PR and between 029d96d and ce07e00.

📒 Files selected for processing (3)

• internal/openshell/sdkclient/auth.go
• internal/openshell/sdkclient/client.go
• internal/openshell/sdkclient/health_e2e_test.go

Included review availability: Your plan provides up to 12 included reviews per hour; 9 remain after this review.

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Walkthrough

Changes

SDK client documentation

Layer / File(s)	Summary
Authentication coverage documentation internal/openshell/sdkclient/auth.go, internal/openshell/sdkclient/client.go	Comments now identify verified mTLS coverage and untested SA-OIDC live dialing. They also document audience and scope verification status.
Health test documentation internal/openshell/sdkclient/health_e2e_test.go	The test comment and skip message no longer reference the “S1 kill-gate.”

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to ce07e

This is a localized documentation cleanup with no behavior change, and the stated build, vet, test, and lint checks are green; no actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 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 removal of build-ladder and implementation-plan references from sdkclient comments.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 3 files.
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.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch rc-pr1-comment-cleanup

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