Add: trailing success confirmation with elapsed time to fledge run (human output)

[0xLeif]

Summary

• The human (non-JSON) path of fledge run <task> previously printed only ▶️ Running task: <name> with no completion signal.
• Adds a trailing ✅ <task> (0.Ns) line, timed with std::time::Instant around the command's .status() call, printed only on success (a failing task still bails before the line, as before).
• Only the human path in execute_task (src/run.rs) changes. The --json run_task envelope is untouched and stays byte-identical, so its tests/snapshots remain green.

Test Plan

• cargo fmt --check clean
• cargo clippy --bin fledge -- -D warnings clean
• cargo test --bin fledge run (72 passed)
• cargo test --test run (20 passed, incl. cli_run_task_json_emits_envelope)
• Manual smoke test: human output shows the new ✅ hello (0.0s) line; --json output shows the unchanged 8-key envelope with no extra line

🤖 Generated with Claude Code

Closes #455

https://claude.ai/code/session_016AvsKakjAc3EKN2ztcMfYi

[gemini-code-assist]

Code Review

This pull request modifies src/run.rs to track and print the execution duration of tasks. It captures the start time using std::time::Instant::now(), calculates the elapsed time after the task command completes, and prints a success message with the duration in seconds. There are no review comments, and we have no feedback to provide.

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[0xGaspar]

Clean addition — Instant wraps only .status(), the line prints only after the success check (a failing task still bails first), and the --json envelope is untouched so snapshots stay byte-identical. LGTM.

[github-actions]

✅ Corvin says...

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    <(^\  .oO(Caw! ^v^)
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"Caw! Your code sparkles like a dropped french fry."

CI Summary

Check	Status
Dependency Audit	✅ Passed
Integration (3 OS)	✅ Passed
Lint (fmt + clippy)	✅ Passed
Spec Validation	✅ Passed
Tests (3 OS)	✅ Passed

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