E2E: Reorganize tests and Fluent Harness

[rmanibus]

Reorganized E2E tests by splitting feature_misc_test.go, refactored harness into a Fluent API, and fixed forget command to support tag-based cleanup. Resolves #173.

[Copilot]

Pull request overview

This PR reorganizes the E2E test suite into feature-focused specs, refactors the shared E2E harness into a fluent (type-driven) API, and extends forget to support filter-only execution (e.g., tag-based cleanup) as part of refining the explicit feature/capability matrix (Issue #173).

Changes:

• Split the previous misc E2E coverage into dedicated feature test files and updated existing tests to use the new fluent harness.
• Refactored the E2E harness to return an initialized repo handle from InitEncrypted / InitUnencrypted, removing legacy “unencrypted” method variants.
• Updated forget CLI + engine validation to allow filter-only runs (no --keep-*) for tag-based cleanup.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
internal/engine/forget.go	Allows policy execution when a non-empty snapshot filter is provided, even if keep policy is empty.
cmd/cloudstic/cmd_forget.go	Updates argument parsing/usage gating to support filter-only forget flows and route them through policy execution.
e2e/harness_test.go	Introduces fluent harness API returning a repo handle with auth args, removing legacy compatibility methods.
e2e/compatibility_smoke_test.go	Migrates smoke matrix test to the new fluent harness (repo).
e2e/feature_backup_restore_test.go	Migrates backup/restore feature tests to the fluent harness.
e2e/feature_break_lock_test.go	Adds a dedicated break-lock feature test using the matrix runner + fluent harness.
e2e/feature_cat_test.go	Adds feature tests for cat config and cat index/latest JSON outputs.
e2e/feature_completion_test.go	Splits completion coverage into its own feature test file.
e2e/feature_diff_test.go	Adds feature tests for diff, including snapshot-vs-snapshot behavior and parsing snapshot IDs from list.
e2e/feature_dry_run_test.go	Adds dedicated dry-run tests for backup and forget.
e2e/feature_encryption_test.go	Migrates encryption tests to fluent harness and expands coverage (init-required, recovery key, unencrypted lifecycle).
e2e/feature_exclude_test.go	Splits exclude-pattern coverage into its own feature test and migrates to fluent harness.
e2e/feature_integrity_test.go	Migrates integrity/check feature test to fluent harness.
e2e/feature_ls_test.go	Adds feature tests for ls (latest and by snapshot ID).
e2e/feature_partial_restore_test.go	Migrates partial restore tests to fluent harness.
e2e/feature_profiles_test.go	Splits profile/store workflow test into its own feature test file.
e2e/feature_retention_test.go	Migrates retention/forget policy tests to the fluent harness repo API.
e2e/feature_tags_test.go	Adds feature coverage for backup tags and forget --tag selective removal.
e2e/feature_misc_test.go	Removes the previous “misc” bucket after splitting into dedicated feature tests.

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