feat: add 'copilot' as primary target name (alias for vscode)

[danielmeppiel]

Summary

Add copilot as the recommended user-facing target name for the GitHub Copilot / Cursor / Codex / Gemini output format. The existing vscode and agents values continue to work as aliases — no breaking changes.

Motivation

The target system uses vscode as the canonical name, but users interact with "GitHub Copilot", "Cursor", "Codex", etc. — not "VS Code" as a platform. Using --target copilot is more intuitive and aligns with Discussion #148 (APM Strategic Direction RFC).

Approach: Alias-only (not full rename)

Rather than renaming the internal TargetType from "vscode" to "copilot" across ~20 source files, ~6 test files, and ~6 doc files, this PR takes the minimal alias approach:

• Entry points accept "copilot" and map it to the internal "vscode" value
• Internal code unchanged — zero regression risk, zero git blame damage
• User-facing docs updated to show copilot as the primary name

This keeps the door open for a full internal rename later if desired, without any risk now.

Changes

Source (4 files)

• src/apm_cli/core/target_detection.py — detect_target() accepts "copilot" in both explicit and config paths; get_target_description() supports "copilot" key
• src/apm_cli/cli.py — compile --target Choice list shows copilot first
• src/apm_cli/commands/pack.py — pack --target Choice list includes copilot
• src/apm_cli/bundle/packer.py — _TARGET_PREFIXES maps "copilot" to .github/ prefixes

Tests (1 file, 3 new tests)

• test_explicit_target_copilot_maps_to_vscode — explicit --target copilot → internal "vscode"
• test_config_target_copilot — apm.yml target: copilot → internal "vscode"
• test_copilot_description — get_target_description("copilot") returns expected description

Docs (4 files)

• compilation.md — target tables, examples, and config show copilot as primary
• concepts.md — "Copilot Target" heading instead of "VSCode/GitHub Target"
• dependencies.md — example comment uses copilot target
• integrations.md — compile example uses --target copilot

Test Results

1801 passed, 94 skipped in 97s

[Copilot]

Pull request overview

Adds copilot as the primary, user-facing --target name (aliasing to internal vscode) across CLI entry points and docs, to better match how users think about the output format (Copilot/Cursor/Codex/Gemini).

Changes:

• Accept copilot in target detection (explicit flag + apm.yml config) while preserving internal "vscode" behavior.
• Update apm compile and apm pack CLI --target choices/help text to include copilot.
• Update docs to present copilot as the primary target and add tests covering the alias behavior.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/unit/core/test_target_detection.py	Adds tests ensuring copilot maps to internal vscode and has a description.
src/apm_cli/core/target_detection.py	Extends target parsing to accept copilot; adds description entry.
src/apm_cli/commands/pack.py	Adds copilot to --target choice list and clarifies aliasing in help text.
src/apm_cli/cli.py	Adds copilot to compile --target choices and updates help text to describe aliasing.
src/apm_cli/bundle/packer.py	Adds copilot to target prefix mapping for packing filters.
docs/integrations.md	Updates example to use --target copilot.
docs/dependencies.md	Updates comment/example wording to refer to copilot target.
docs/concepts.md	Renames concept section heading to “Copilot Target”.
docs/compilation.md	Updates auto-detect table, examples, and config to show copilot as primary + notes aliases.