chore: remove dead code reported by deadcode

[computermode]

https://entire.io/gh/entireio/cli/trails/459

Remove 75 unreachable functions found via:
deadcode -test -tags=e2e,integration,authfilestore ./...

Bare deadcode ./... flags test/bench/e2e helpers as dead because it ignores _test.go files and build-tagged code; the -test/-tags form gives the accurate set. Kept the promptOnlyReaderStub methods (interface satisfaction only). Also dropped imports, an orphaned const, two orphaned regex vars, and pre-existing dead Yes: true test writes that govet's unusedwrite surfaced once the package's go:linkname was removed.

Verified: deadcode clean, go vet across all tags, mise run lint, and mise run test:ci (unit + integration + e2e canary) all pass.

---

Note

Low Risk
Mechanical deletion of unused code with no remaining references; behavior of shipped CLI paths should be unchanged aside from smaller API surface in internal/test packages.

Overview
Removes ~75 unreachable symbols across the CLI after analysis with deadcode -test -tags=e2e,integration,authfilestore, trimming dead production paths and test-only helpers that no longer have callers.

Production / library surface: drops unused pieces such as the inactive renderBrailleChart activity UI, auth.Token, remote.LsRemote / ExtractOwnerFromRemoteURL, DeleteRefCLI and ExtractSessionIDFromCommit in strategy, v2 metadata doctor/reconcile helpers, several commit-trailer parse/format APIs, ReadTaskCheckpoint, and investigate.StateStore.Root / review.IsReviewEnvEntry.

Tests & benches: large cuts in integration_test (Gemini/Droid hook runners, many Simulate* / TestEnv helpers), testutil, benchutil.AddAndCommit, common_helpers_test.go, and e2e helpers (CloneAndEnableEntire, extra explain/attach options). global_test.go drops a go:linkname hook into go-git’s plugin reset.

Cleanup: unused imports, orphaned regex/consts, and setup tests stop writing obsolete EnableOptions.Yes fields now that that field is gone.

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[Copilot]

Pull request overview

This PR removes unreachable/dead code paths (production, tests, integration/e2e helpers) as identified by deadcode -test -tags=e2e,integration,authfilestore ./..., reducing maintenance surface without intended behavior changes.

Changes:

• Deleted ~75 unreachable functions/helpers across production code and test utilities (including e2e/integration runners and strategy/remote helpers).
• Cleaned up now-unused imports/constants/regexes and removed an unused go:linkname test hook.
• Adjusted tests to stop writing now-unused struct fields (e.g., EnableOptions.Yes) to satisfy govet/unusedwrite.

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
e2e/testutil/repo.go	Removes unused repo-clone+enable helper from e2e testutil.
e2e/testutil/assertions.go	Removes unused console log assertion helper.
e2e/entire/entire.go	Removes unused checkpoint explain helper wrappers.
e2e/agents/agent.go	Removes unused run options (WithModel, WithPermissionMode).
cmd/entire/cli/trailers/trailers.go	Drops unused trailer regexes and parse/format helpers (strategy/condensation-related).
cmd/entire/cli/testutil/testutil.go	Removes unused file helpers and git-history checkpoint helpers from CLI testutil.
cmd/entire/cli/strategy/strategy.go	Removes unused task-checkpoint reader and related imports.
cmd/entire/cli/strategy/metadata_reconcile.go	Removes unused v2 “doctor/reconcile” disconnection logic and remote helpers.
cmd/entire/cli/strategy/common.go	Removes unused ref-deletion and session-ID extraction helpers and the trailers import.
cmd/entire/cli/strategy/common_test.go	Removes unused test-only cache reset helper and import.
cmd/entire/cli/strategy/common_helpers_test.go	Deletes unused full-deserialization test helper file.
cmd/entire/cli/setup_test.go	Removes unused writes to EnableOptions.Yes in telemetry-related tests.
cmd/entire/cli/review/env.go	Removes unused exported env-entry predicate wrapper.
cmd/entire/cli/investigate/state.go	Removes unused StateStore.Root() accessor.
cmd/entire/cli/integration_test/testenv.go	Removes unused integration test environment helpers (stdin runner, commit helpers, ref readers).
cmd/entire/cli/integration_test/hooks.go	Removes unused hook simulation APIs (response/output variants) and Gemini/Droid helper scaffolding.
cmd/entire/cli/global_test.go	Removes unused go:linkname reset hook and unsafe import.
cmd/entire/cli/checkpoint/remote/util.go	Removes unused owner-extraction wrapper.
cmd/entire/cli/checkpoint/remote/git.go	Removes unused LsRemote wrapper (keeps LsRemoteInDir).
cmd/entire/cli/benchutil/benchutil.go	Removes unused benchmark repo AddAndCommit helper.
cmd/entire/cli/auth/exchange.go	Removes unused auth.Token convenience entry point (keeps resource-scoped API).
cmd/entire/cli/activity_render.go	Removes inactive braille-chart renderer implementation.