feat: finish Rust CLI port and human workflows

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Closes #329

What changed

• adds the Rust workspace and 0.9.0-alpha.1 Dotdog crate with dotdog and spec binaries
• ports parser, DAG compiler, graph queries, MCP, workspace handling, repo mapping, observation, drift, Spec Kit import, live endpoint checks, and cloud-provider verification
• adds dotdog guide for greenfield, existing repository, and GitHub Spec Kit workflows
• adds self-contained interactive HTML graph maps with search, node focus, pan, and zoom
• rewrites onboarding and why/how documentation with exact commands and Git guidance
• adds Linux, macOS, and Windows Rust CI plus Cargo package verification

Verification

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets --all-features -- -D warnings
• cargo test --workspace --all-features: 20 passed
• localhost live endpoint integration test: passed outside the sandbox
• cargo package --manifest-path crates/dotdog/Cargo.toml: passed
• cargo publish --dry-run --manifest-path crates/dotdog/Cargo.toml: passed; upload aborted as expected
• bun test packages/dotdog/tests: 58 passed, 1 snapshot
• dotdog validate: 100 percent for both projects
• dotdog doctor: 2 passed, 0 failed
• dotdog analyze --project dotdog: 100 percent, no gaps

Release boundary

This is a prerelease candidate. It does not publish a crate, tag a release, deprecate npm, or merge the branch. Provider checks still need least-privilege account acceptance before stable cutover.