Publish Deed through the official MCP Registry

[onatozmenn]

What this changes

Prepares 0.2.12 for the official MCP Registry. server.json describes the existing deed mcp stdio command through the deed-lang Cargo package, and the package now ships a short README with the visible ownership marker the Registry validates.

The patch release also puts the corrected Rust 1.88 minimum into crates.io metadata. The published 0.2.11 package still reports 1.85.

Why this way

The Registry now supports crates.io directly. Deed already ships there, so a Cargo package plus the fixed mcp argument is the smallest honest distribution path. A focused test keeps the Registry name, package name, version, transport, argument, and README marker together.

What it still does not do

The Registry entry cannot be published until deed-lang 0.2.12 exists on crates.io. That happens after this release commit merges.

Checks

• cargo fmt --check
• cargo clippy --workspace --all-targets -- -D warnings
• cargo nextest run --workspace --profile ci --no-fail-fast (2522 passed, 4 skipped)
• cargo test --doc --workspace (11 passed)
• Rust 1.88.0 cargo check --workspace --locked
• cargo publish --workspace --dry-run --locked (20 packages)
• mcp-publisher validate --file server.json
• Tests added for the Registry metadata and published ownership marker

[Copilot]

Pull request overview

Prepares Deed 0.2.12 for publication via the official MCP Registry by adding Registry metadata (server.json) and ensuring the published deed-lang Cargo package exposes the expected README ownership marker and correct minimum Rust version metadata.

Changes:

• Added server.json describing deed mcp as a Cargo-installed stdio MCP server for the official Registry.
• Shipped a crate-level README for deed-lang (with the mcp-name: ownership marker) and wired it into crates.io metadata.
• Bumped workspace and lockfile versions to 0.2.12 and updated documentation/changelog accordingly.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
server.json	Adds official MCP Registry server metadata pointing at the deed-lang Cargo package and deed mcp entrypoint.
README.md	Updates install/version examples and documents the official Registry name.
crates/deed-cli/tests/registry.rs	Adds an integration test to keep Registry metadata + README ownership marker in sync with published crate metadata.
crates/deed-cli/README.md	Adds the crate README including the mcp-name: ownership marker required by the Registry.
crates/deed-cli/Cargo.toml	Sets readme = "README.md" so crates.io metadata points at the shipped crate README.
CHANGELOG.md	Adds the 0.2.12 release entry describing the Registry/README changes and Rust 1.88 minimum.
Cargo.toml	Bumps workspace version and internal dependency versions to 0.2.12.
Cargo.lock	Updates locked package versions to 0.2.12.

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