feat(construct-cli): Phase 2 — imperative installer + 73-agent registry

Adds the vercel-labs-style broad agent support: registry/agents.toml (72 agents ported from vercel-labs/skills src/agents.ts, MIT, + Grok flat) embedded via include_str!, with HM-managed detection (symlink->~/.agents/skills). New commands: `agent list`; `skill add/list/remove/update` (symlink default, --copy, --dry-run, project/global scope). Coexistence rule with the declarative HM module: project-local by default; a global install into an HM-managed dir is refused (explicit --agents -> exit 5, broad selection -> skipped). Registry is dual-licensed GPL-3.0-or-later OR MIT (REUSE.toml + CREDITS.md, §4.2). 16 tests, clippy -D warnings, reuse lint, and nix build all pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: UnbreakableMJ

REUSE.toml

@@ -36,3 +36,13 @@ path = ["spacecraft-rust-guidelines/references/idioms.md", "spacecraft-rust-guid
 precedence = "override"
 SPDX-FileCopyrightText = ["2024 Apollo Graph, Inc.", "2026 Mohamed Hammad <Mohamed.Hammad@SpacecraftSoftware.org>"]
 SPDX-License-Identifier = "GPL-3.0-or-later"
+
+# Third-party-derived data: the construct CLI's agent registry is ported from
+# vercel-labs/skills (src/agents.ts, MIT, © Vercel, Inc.). Dual-licensed
+# GPL-3.0-or-later OR MIT by Spacecraft Software (the MIT arm preserves Vercel's
+# notice; MIT→GPL compatible), §4.2. See construct-cli/CREDITS.md.
+[[annotations]]
+path = "construct-cli/registry/agents.toml"
+precedence = "override"
+SPDX-FileCopyrightText = ["Vercel, Inc.", "2026 Mohamed Hammad <Mohamed.Hammad@SpacecraftSoftware.org>"]
+SPDX-License-Identifier = "GPL-3.0-or-later OR MIT"

construct-cli/CREDITS.md

@@ -0,0 +1,20 @@
+# Credits
+
+## Agent registry — vercel-labs/skills
+
+`registry/agents.toml` — the set of supported AI coding agents and their
+project/global skills directories — is **derived from the
+[vercel-labs/skills](https://github.com/vercel-labs/skills) project**,
+specifically its `src/agents.ts` registry, © Vercel, Inc., licensed under the
+**MIT License**.
+
+The Spacecraft Software adaptation reorganizes that data into a static TOML
+registry embedded in the `construct` binary. Per Standard §4.2 (third-party-
+derived artifacts preserve their upstream license), `registry/agents.toml` is
+dual-licensed **`GPL-3.0-or-later OR MIT`** — the MIT arm preserves Vercel's
+notice — as recorded in the repository `REUSE.toml`. Only home-relative path
+defaults are modeled; the upstream's environment-variable overrides
+(`CODEX_HOME`, `CLAUDE_CONFIG_DIR`, `XDG_CONFIG_HOME`, …) are not.
+
+The rest of the `construct` CLI is original Spacecraft Software work licensed
+`GPL-3.0-or-later`.

construct-cli/Cargo.lock

@@ -25,6 +25,7 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 serde_yaml = "0.9"
 csv = "1"
+toml = "0.8"
 # Only the UTC `Timestamp` + `std` clock are used; trimming default features
 # drops the optional `defmt` integration (and its unmaintained transitive deps).
 jiff = { version = "0.2", default-features = false, features = ["std"] }
@@ -34,6 +35,7 @@ owo-colors = "4"
 assert_cmd = "2"
 predicates = "3"
 serde_json = "1"
+tempfile = "3"
 
 # Stability- and size-oriented release profile (Standard §3). `target-cpu=native`
 # is deliberately NOT set here: this crate is distributed as a portable Nix