feat: add --json flag to find and resolve commands

[karthiknadig]

Adds a --json / -j flag to the find and resolve CLI commands for simple one-shot JSON output without needing the JSONRPC server.

• pet find --json outputs { "managers": [...], "environments": [...] }
• pet resolve --json <exe> outputs the resolved PythonEnvironment object (or null)
• All other flags (--list, --verbose, --report-missing, etc.) continue to work as before
• JSON serialization uses camelCase field naming consistent with the JSONRPC API
• Summary/timing output is suppressed in JSON mode to keep stdout clean

Fixes #87

[github-actions]

Test Coverage Report (Linux)

Metric	Value
Current Coverage	58.3%
Base Branch Coverage	58.7%
Delta	-.4% ❌

---

Coverage decreased. Please add tests for new code.

[github-actions]

Performance Report (Linux) ➖

Metric	PR (P50)	PR (P95)	Baseline (P50)	Delta	Change
Server Startup	1ms	1ms	1ms	0ms	0%
Full Refresh	79ms	699ms	76ms	3ms	0%

Results based on 10 iterations. P50 = median, P95 = 95th percentile.

---

Legend

• 🚀 Significant speedup (>100ms faster)
• ✅ Faster than baseline
• ➖ No significant change
• 🔺 Slower than baseline (>100ms)
• ⚠️ Significant slowdown (>500ms)

[github-actions]

Test Coverage Report (Windows)

Metric	Value
Current Coverage	54.58%
Base Branch Coverage	54.95%
Delta	-0.37% ❌

---

Coverage decreased. Please add tests for new code.

[github-actions]

Performance Report (Windows) ✅

Metric	PR (P50)	PR (P95)	Baseline (P50)	Delta	Change
Server Startup	9ms	12ms	10ms	-1ms	-10%
Full Refresh	149ms	6621ms	199ms	-50ms	-25.1%

Results based on 10 iterations. P50 = median, P95 = 95th percentile.

---

Legend

• 🚀 Significant speedup (>100ms faster)
• ✅ Faster than baseline
• ➖ No significant change
• 🔺 Slower than baseline (>100ms)
• ⚠️ Significant slowdown (>500ms)

[Copilot]

Pull request overview

This PR adds JSON output support to the find and resolve CLI commands via a new --json / -j flag, enabling simple one-shot usage without requiring the JSONRPC server. The implementation reuses existing infrastructure (the collect reporter for gathering results) and maintains consistency with the JSONRPC API's camelCase field naming.

Changes:

• Added --json flag to both find and resolve CLI commands for structured JSON output
• Implemented find_envs_json function that collects environments/managers and outputs them as JSON
• Modified resolve_report_stdio to output JSON when the flag is set, including null for missing environments
• Suppressed timing/summary output in JSON mode to keep stdout clean (logs still go to stderr)

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
crates/pet/src/main.rs	Added json: bool field to Find and Resolve command structs and passed it to the handler functions
crates/pet/src/lib.rs	Implemented JSON output logic: added find_envs_json function, modified resolve_report_stdio to support JSON, and imported necessary modules

[github-actions]

Performance Report (macOS)

Metric	PR (P50)	PR (P95)	Baseline (P50)	Delta
Server Startup	83ms	730ms	55ms	28ms
Full Refresh	161ms	37675ms	114ms	47ms

Results based on 10 iterations. P50 = median, P95 = 95th percentile.

---

Legend

• 🚀 Significant speedup (>100ms faster)
• ✅ Faster than baseline
• ➖ No significant change
• 🔺 Slower than baseline (>100ms)
• ⚠️ Significant slowdown (>500ms)