test(output_format_contract): add plugins json coverage to inventory_commands test

[code-yeongyu]

Adds four assertions to the existing inventory_commands_emit_structured_json_when_requested test in output_format_contract.rs:

• kind == "plugin"
• action == "list"
• reload_runtime is boolean
• target is null when no plugin is targeted

claw plugins --output-format json was the only major JSON surface with zero contract coverage. Every other surface (agents, mcp, skills, status, sandbox, doctor, help, version, acp, bootstrap-plan, system-prompt, init, diff, config) already had assertions.

Local test run: cargo test -p rusty-claude-cli -- inventory_commands_emit_structured_json_when_requested → 2 passed (0 failed).

[Yeachan-Heo]

Review verdict: APPROVE

Inspected exact diff against current main:

• Base: 57096b0
• Head: 7cd5277
• Changed files: one test file only
  • rust/crates/rusty-claude-cli/tests/output_format_contract.rs
• Diff size: +12
• No source/runtime files changed.

Coverage verified: the PR adds claw --output-format json plugins assertions inside inventory_commands_emit_structured_json_when_requested, exercising the relevant path through assert_json_command(&root, &["--output-format", "json", "plugins"]).

Assertions added/checked:

• kind == "plugin"
• action == "list"
• reload_runtime is boolean
• target is null when no plugin target is provided

Current implementation sanity checked: plugin JSON output already emits kind, action, target, and reload_runtime; this PR locks existing behavior with contract coverage.

CI is green: cargo fmt, cargo clippy, cargo test, and docs source-of-truth all pass.

Targeted local test passed from PR head:

• cargo test -p rusty-claude-cli --test output_format_contract inventory_commands_emit_structured_json_when_requested -- --nocapture

The filter also matched resumed_inventory_commands_emit_structured_json_when_requested; both passed.

Merge risk: very low. Blockers: none. Owner confirmation: not needed, test-only coverage addition.

—
[repo owner's gaebal-gajae (clawdbot) 🦞]

[Yeachan-Heo]

Review verdict: APPROVE

Inspected PR #2972 against current origin/main.

Scope:

• Test-only change in rust/crates/rusty-claude-cli/tests/output_format_contract.rs
• No source/runtime files changed

What it covers:

• Adds claw --output-format json plugins coverage inside inventory_commands_emit_structured_json_when_requested
• Verifies the existing contract fields:
  • kind == "plugin"
  • action == "list"
  • reload_runtime is a boolean
  • target == null when no plugin target is provided

Verification:

• GitHub CI is green: fmt, clippy, workspace tests, docs source-of-truth
• Local targeted run passed:
  • cargo test -p rusty-claude-cli --test output_format_contract inventory_commands_emit_structured_json_when_requested -- --nocapture

Merge risk: very low. This is narrow test coverage for the already-existing plugins JSON contract, so no owner confirmation gate is needed.

—
[repo owner's gaebal-gajae (clawdbot) 🦞]