chore(license): declare MIT on the crates (open-source Phase 4a A4)

The repo ships an MIT LICENSE and the README carries an MIT badge, but the
crates themselves declared no license, so `cargo metadata`, packaging and any
downstream mirror saw "license: null". Adds [workspace.package] license = "MIT"
and inherits it in all five members via license.workspace = true. Verified with
cargo metadata: all five now report MIT.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

core/Cargo.toml

@@ -9,6 +9,12 @@ members = [
     "security",
 ]
 
+# Shared package metadata, inherited by each member via `license.workspace = true`.
+# The repo ships an MIT LICENSE and the README advertises MIT; this makes the
+# crates themselves declare it so `cargo metadata`, packaging and mirrors agree.
+[workspace.package]
+license = "MIT"
+
 # Profiles at workspace root (members' [profile] are ignored in virtual workspaces)
 [profile.release]
 opt-level = 3

core/archipelago/Cargo.toml

@@ -2,6 +2,7 @@
 name = "archipelago"
 version = "1.7.126-alpha"
 edition = "2021"
+license.workspace = true
 description = "Archipelago Bitcoin Node OS - Native backend"
 authors = ["Archipelago Team"]
 

core/container/Cargo.toml

@@ -2,6 +2,7 @@
 name = "archipelago-container"
 version = "0.1.0"
 edition = "2021"
+license.workspace = true
 
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }

core/openwrt/Cargo.toml

@@ -2,6 +2,7 @@
 name = "archipelago-openwrt"
 version = "0.1.0"
 edition = "2021"
+license.workspace = true
 description = "OpenWrt gateway integration for Archipelago — TollGate provisioning over SSH/UCI"
 
 [lib]

core/performance/Cargo.toml

@@ -2,6 +2,7 @@
 name = "archipelago-performance"
 version = "0.1.0"
 edition = "2021"
+license.workspace = true
 
 [dependencies]
 tokio = { version = "1", features = ["full"] }

core/security/Cargo.toml

@@ -2,6 +2,7 @@
 name = "archipelago-security"
 version = "0.1.0"
 edition = "2021"
+license.workspace = true
 
 [dependencies]
 tokio = { version = "1", features = ["full"] }