Improve report readability and preserve run details with timestamped summary/detail folders

[mouxinqq]

Motivation

• Make session-level statistics easier to read and triage by replacing single-line TSV with human-friendly Markdown tables and a prioritized Top-20 view.
• Prevent per-run detail files from being overwritten by separating run artifacts and always creating timestamped run folders.
• Keep troubleshoot output layout consistent with stat-cache-hitrate so both skills produce predictable, non-destructive exports.

Description

• Added _render_markdown_table and _truncate_text helpers and replaced TSV session export with Markdown tables and a prioritized "Top 20" troubleshooting table in stat-cache-hitrate/scripts/stat_cache_hitrate.py.
• Changed stat-cache-hitrate report export to create <base>/<YYYYMMDD_HHMMSS>/summary and <base>/<YYYYMMDD_HHMMSS>/detail directories, write a stable summary/cache_hitrate_report.md, and place per-window/session details under detail/, and updated in-report links accordingly.
• Applied the same timestamped summary + detail output layout to troubleshoot/scripts/troubleshoot.py and adjusted its detail file writes to detail/.
• Updated SKILL.md for both stat-cache-hitrate and troubleshoot to document that --output is a base directory and to list the new summary/ and detail/ locations.

Testing

• Ran Python byte-compile check with python3 -m py_compile fastdeploy/golang_router/.claude/skills/stat-cache-hitrate/scripts/stat_cache_hitrate.py fastdeploy/golang_router/.claude/skills/troubleshoot/scripts/troubleshoot.py, which succeeded.
• Verified CLI help invocations python3 fastdeploy/golang_router/.claude/skills/stat-cache-hitrate/scripts/stat_cache_hitrate.py --help and python3 fastdeploy/golang_router/.claude/skills/troubleshoot/scripts/troubleshoot.py --help, both completed successfully.

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