Resolve existing golangci-lint baseline (35 findings)

[PierrunoYT]

Summary

The repository-wide lint command currently reports 35 pre-existing findings:

• 27 staticcheck findings
• 6 unused findings
• 2 ineffassign findings

These findings are unrelated to PR #725, but prevent contributors from completing the mandatory lint check with a clean result.

Reproduction

Because of the toolchain problem tracked in #680, explicitly select Go 1.26.5:

$env:GOTOOLCHAIN = 'go1.26.5'
go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.12.2 run --enable-only unused,ineffassign,staticcheck ./...

Findings

ineffassign

• internal/cli/mcp_config.go:737
• internal/cli/mcp_config.go:744

unused

• internal/sandbox/runner.go:385 - existingBubblewrapMounts
• internal/sandbox/runner.go:795 - denyWriteRules
• internal/sandbox/runner.go:827 - networkRuleFor
• internal/tui/model.go:2950 - model.scrollableTranscriptView
• internal/tui/streaming_fade.go:284 - model.ensureAgeTickReschedule
• internal/tui/transcript_selection.go:1278 - transcriptViewportStartForLayout

staticcheck

• internal/agenteval/score.go:128 (S1011)
• internal/agentinit/agentinit.go:43,48,50 (QF1012)
• internal/cli/agent_eval.go:518 (S1011)
• internal/cli/provider_detect.go:86 (QF1002)
• internal/dictation/transcriber_deepgram.go:103 (ST1005)
• internal/lsp/navigate_test.go:67,79 (SA1012)
• internal/provideronboarding/localruntime_test.go:65 (S1009)
• internal/sandbox/adapters.go:228 (QF1001)
• internal/sandbox/command_prefix.go:156 (S1008)
• internal/sandbox/engine.go:236 (QF1001)
• internal/sandbox/landlock_other.go:7 (ST1005)
• internal/sandbox/windows_network.go:13 (ST1005)
• internal/specialist/exec.go:830 (QF1008)
• internal/tui/files_git_sweep_test.go:195 (SA1012)
• internal/tui/model_test.go:1399 (SA4006)
• internal/tui/onboarding.go:221,230,282 (QF1003)
• internal/tui/provider_wizard_test.go:686 (SA4006)
• internal/tui/specialist_card.go:417 (QF1002)
• internal/update/apply.go:165 (QF1003)
• internal/update/apply_test.go:154 (QF1003)
• internal/update/update.go:370 (ST1005)
• internal/usercommands/usercommands.go:112 (QF1001)

Expected result

The mandatory lint command exits successfully with no findings.

Context

Observed while validating PR #725 at commit fef6c5d on Windows/amd64. None of the reported files were changed by that commit.