Add detailed file-level logging to unpack command

[Copilot]

Description

Adds verbose, per-dependency file-level logging to apm unpack, consistent with the tree-style output used by apm install. Previously, the unpack command only showed a final summary count — now it shows exactly where each file is copied, grouped by dependency.

Before:

Unpacked 5 file(s) (verified)

After:

Unpacking my-bundle.tar.gz → ./
  org/repo-a
    └─ .github/prompts/design-review.prompt.md
    └─ .github/agents/architect.md
  org/repo-b
    └─ .github/instructions/coding-standards.instructions.md
Unpacked 3 file(s) (verified)

No emojis used in any output. Logging aesthetics are consistent with apm install's tree-style (└─) pattern. Dependencies are keyed by get_unique_key() to correctly handle virtual dependencies (same repo_url with different virtual_path).

Type of change

• Bug fix
• New feature
• Documentation
• Maintenance / refactor

Testing

• Tested locally
• All existing tests pass
• Added tests for new functionality (if applicable)

New tests added (10):

• test_unpack_dependency_files_single_dep — verifies dependency_files maps repo_url to deployed files
• test_unpack_dependency_files_multiple_deps — multi-dependency file tracking
• test_unpack_dependency_files_virtual_deps — virtual deps from the same repo are tracked separately via get_unique_key()
• test_unpack_dependency_files_dry_run — dependency_files populated in dry-run
• test_unpack_skipped_count — tracks missing files with skip_verify
• test_unpack_skipped_count_zero_when_all_present — zero skipped when complete
• test_unpack_cmd_logs_file_list — CLI output includes dependency name and file paths
• test_unpack_cmd_dry_run_logs_files — dry-run CLI shows per-dependency breakdown
• test_unpack_cmd_logs_skipped_files — skipped files warning in CLI output
• test_unpack_cmd_multi_dep_logging — multi-dependency CLI output

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[Copilot]

Pull request overview

This PR enhances apm unpack to emit per-dependency, tree-style file listings (similar to apm install) instead of only a final summary, by tracking deployed files per dependency during bundle unpacking.

Changes:

• Extend UnpackResult to include dependency_files and skipped_count, and populate these during unpack_bundle().
• Update apm unpack CLI output to print per-dependency file lists and warn when files are skipped due to --skip-verify.
• Add unit tests covering dependency-level file tracking, skipped counts, and CLI output expectations.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/apm_cli/bundle/unpacker.py	Adds per-dependency file mapping + skipped-file counting to support detailed unpack logging.
src/apm_cli/commands/pack.py	Implements tree-style per-dependency logging for apm unpack output.
tests/unit/test_unpacker.py	Adds new unit tests for dependency_files, skipped_count, and unpack command logging output.

[danielmeppiel]

@copilot address pr review comments

[Copilot]

@copilot address pr review comments

All three review comments addressed in b574d32:

1. Removed unused UnpackResult import from test file
2. Switched dep_file_map key from dep.repo_url to dep.get_unique_key() — virtual deps (same repo, different virtual_path) now get separate entries
3. Added test_unpack_dependency_files_virtual_deps test covering the virtual dependency key collision case