test: add group-level --path propagation tests (#60)

[microsasa]

Closes #60

What

Adds four tests verifying that the group-level --path option propagates correctly to all four subcommands (summary, cost, live, session) via ctx.obj["path"].

Why

Each subcommand contains path = path or ctx.obj.get("path") to support copilot-usage --path /dir summary syntax, but this fallback path was untested with the specific session IDs and assertions specified in issue #60. If the propagation line or ctx.obj["path"] = path in main were accidentally removed, no existing test would catch the regression.

Tests added

Test	Subcommand	Session ID prefix
test_summary_group_path_propagation	summary	grp10000
test_cost_group_path_propagation	cost	grp20000
test_live_group_path_propagation	live	grp30000
test_session_group_path_propagation	session	grp40000

Verification

• All 408 tests pass
• Coverage at 98% (well above 80% threshold)
• ruff check, ruff format, and pyright all pass cleanly

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[Copilot]

Pull request overview

Adds additional CLI tests intended to ensure the group-level --path option (stored in ctx.obj["path"]) is correctly honored by subcommands when the subcommand-level --path is omitted.

Changes:

• Add 4 new tests for group-level --path propagation across summary, cost, live, and session.
• Introduce new session IDs/prefixes and (in one case) a stronger output assertion for the summary path-propagation scenario.

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[github-actions]

Commit pushed: 3196e45

Generated by Review Responder

[Copilot]

Pull request overview

This PR improves coverage for the CLI’s group-level --path option propagation to subcommands (the ctx.obj["path"] fallback path), specifically ensuring the live command’s test validates that the session under the provided group-level path is actually rendered.

Changes:

• Strengthen test_group_path_propagates_to_live by asserting the expected session identifier/name appears in output.

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[github-actions]

Quality Gate: APPROVED ✅

Change: 1 line added to test_group_path_propagates_to_live — adds an output assertion (assert "grp_liv00" in result.output or "GrpLive" in result.output) matching the pattern of all sibling test_group_path_propagates_to_* tests.

Impact: LOW — test-only change, single assertion addition.

Evaluation:

• Follows existing test patterns consistently (all four group-path tests now assert both exit code and output content)
• Addresses Copilot review feedback (removed duplicate tests, strengthened existing test)
• No production code changes, no risk to runtime behavior

Auto-approving for merge.