docs: scrub remaining internal repo + tooling references

- README.md: drop "first Sulkta Rust project — workout for crafting-
  table's Rust toolchain" paragraph + the `ci-runner build aldabra`
  recipe. Both reference non-public internal infrastructure.
- Dockerfile: drop "Built nightly on the build host (see infra-repo/scripts/
  build.sh)" comment + the `registry.example.com:5000/aldabra/mcp`
  internal image-name advertisement.
- Cargo.toml: drop the comment block referencing the deleted
  `docs/internal-build-rewrites.md` + `ci-runner + the build host + dev
  hosts` internal-builds note. The patch block stands on its
  own.

Cargo.toml

@@ -100,12 +100,6 @@ rpassword = "7"
 # in). Patches all pallas-* crates so the version graph resolves
 # consistently against the same commit. PR upstream pending; switch back
 # to crates.io once merged.
-#
-# Source URLs point at the public github mirror so external clones build
-# out of the box. Sulkta-internal builds short-circuit to the LAN gitea
-# via a `git config url.*.insteadOf` rewrite — no network egress, same
-# locked SHA. See `docs/internal-build-rewrites.md` for the one-line
-# config that wires that up on the build host + ci-runner + dev hosts.
 [patch.crates-io]
 pallas-codec      = { git = "https://github.com/Sulkta-Coop/pallas.git", branch = "feat-aux-data" }
 pallas-crypto     = { git = "https://github.com/Sulkta-Coop/pallas.git", branch = "feat-aux-data" }

Dockerfile

@@ -5,10 +5,9 @@
 #   1. builder — rust toolchain, cargo build --release
 #   2. runtime — debian:bookworm-slim, just the binary + ca-certs.
 #
-# Built in CI and
-# published as a container image (aldabra/mcp). Pulled
-# anywhere we want the MCP server available — usually as a sidecar
-# spawned by an MCP client (e.g. Claude Code).
+# Produces an `aldabra/mcp` image with the MCP-server binary baked in.
+# Pulled anywhere the MCP server is needed — usually as a sidecar
+# spawned by an MCP client (Claude Code, etc).
 #
 # Required env at runtime:
 #   ALDABRA_DATA           directory containing mnemonic.age (must

README.md

@@ -15,10 +15,6 @@ which is a centralized API we deliberately don't depend on. We want a
 wallet that talks directly to Koios + Ogmios endpoints — public, self-
 hosted, or whatever the operator points it at.
 
-Also: it's the first Sulkta Rust project — useful as a workout for
-ci-runner's Rust toolchain (per `Sulkta-Coop/infra-repo`
-`spec-ci-runner.md`).
-
 ## Architecture
 
 Three crates in a Cargo workspace:
@@ -66,11 +62,8 @@ Phase 4:
 ## Build
 
 ```bash
-# Local (requires rustc 1.75+)
+# Requires rustc 1.75+
 cargo build --release
-
-# Through ci-runner (preferred — validates the toolchain there)
-ci-runner build aldabra
 ```
 
 ## Run