Public-flip audit: scrub internal refs + add LICENSE

Repository URL → git.sulkta.com. Drop internal endpoints from tool doc-strings
(replaced with abstract 'sandboxed headless browser' guidance). Drop sibling-repo
cross-references, example mailbox addresses in tool descriptions, vault
pointers. Generalize config.example.toml + README to neutral hosts. Add LICENSE
(MIT — Cargo.toml already declared it).

Tests still green. No behavior change.

Cargo.toml

@@ -1,13 +1,8 @@
-# Cargo workspace root for Carrier — a Rust MCP email server.
+# Carrier — Rust MCP email server. SMTP send + IMAP read.
 #
-# Named after the carrier pigeon: single-purpose, reliable, comes back
-# every time. Carries Sulkta-hosted mail (alice@/bob@/abby@/bay@/jay@)
-# to and from any MCP client.
-#
-# One crate today (carrier), workspace shape so we can grow without
-# rework. Same pattern as aldabra.
-#
-# Workspace deps pinned here; each crate references with `foo = { workspace = true }`.
+# One crate today (carrier), workspace shape so it can grow without
+# rework.
+
 [workspace]
 resolver = "2"
 members = ["crates/carrier"]
@@ -22,8 +17,7 @@ authors = ["Sulkta <oss@sulkta.com>"]
 [workspace.dependencies]
 tokio = { version = "1", features = ["full"] }
 
-# MCP — same crate aldabra uses. Pinned to 0.1 series; bump together
-# across repos when we move.
+# MCP — pinned to the 0.1 series.
 rmcp = { version = "0.1", features = ["server", "transport-io"] }
 schemars = "0.8"