feat(cli): modernize presentation and CI reporting - #165

Summary

• replace the hand-written wright argv/help layer with one clap command model;
• generate Bash, Zsh, Fish, and PowerShell completion from that model;
• add deterministic text/JSON, terminal/plain/GitHub Actions, and color policies;
• keep driver envelopes, exit codes, JSON stdout, and compile/convert source artifacts unchanged;
• add escaped structured GitHub annotations, grouping, and PASS/WARN/ERROR summary output;
• document the presentation contract and add black-box regression coverage.

Contract boundaries

wright-driver remains the owner of semantic execution, typed wright-result/v1 envelopes, diagnostics, exit codes, and artifact file I/O. The CLI presentation layer consumes those structured results.

JSON mode emits only one envelope to stdout. Compile/convert text mode emits only the source artifact, byte-for-byte; compile -o emits no artifact to stdout. GitHub workflow commands are emitted on the diagnostic stream, while artifact stdout remains pure; GITHUB_STEP_SUMMARY is used when available.

Verification

• cargo fmt --all -- --check
• git diff --check
• cargo check --workspace --all-targets
• cargo clippy --workspace --all-targets -- -D warnings
• cargo test --locked -p wright-cli --all-targets --all-features — 63 passed
• cargo test --workspace — passed
• independent QA verified top-level help compatibility, all four completion shells, renderer/override coverage, and plain/GitHub artifact byte equality.

Fixes #164