hello-mcode-hooks-v04

# hello-mcode-hooks-v04 This is the canonical example Plugin for the mcode 0.4.0+ plugin format. It mirrors the structure of `examples/hello-mcode-hooks/` (the v0.3.x example) but uses the new manifest location, the inline `hooks` field, and a top-level Skill file. The Hook entries record every `PreToolUse`, `SessionStart`, and `SessionEnd` event the runtime delivers to a per-instance state file under the runtime-injected `PLUGIN_DATA` directory. The script is a PowerShell observer that does not modify any tool input, does not change any permission decision, and exits zero on every code path. The Hook is a structural reference for new Plugin authors; it is not a working integration against the portable Agent Plugins 1.0 surface. ## Disclosure This example contains: - no credentials; - no network access; - no telemetry; - no third-party services. All state is local to the per-Plugin `PLUGIN_DATA` directory. The Hook script only writes to that directory and exits. ## Cross-runtime note This example ships a top-level `skills/SKILL.md` (used by mcode 0.4.0+) and a byte-identical copy at `skills/hello-mcode-hooks-v04/SKILL.md` (used by the current validator and by the v0.3.x runtime if it ever reads the new layout). The validator scans `skills/<subdirectory>/SKILL.md`; the subdirectory copy is what satisfies that check until the validator is updated to accept the top-level layout.