feat: accept human-friendly duration formats in prune --older-than

[Copilot]

The prune --older-than option required ISO 8601 duration format (e.g., P30D, P1Y), which is unintuitive for most users.

Changes

Added normalizeDuration() utility

• Converts human-friendly formats (30d, 2w, 6M, 1y) to ISO 8601 before parsing
• Case-sensitive: uppercase M = months, lowercase m = minutes
• Pass-through for existing ISO 8601 inputs (backward compatible)

Updated parseDuration()

• Now accepts both human-friendly and ISO 8601 formats
• Updated error messages to reflect new formats

Command usage

# All now valid:
grove prune --older-than 30d
grove prune --older-than 6M
grove prune --older-than 1y
grove prune --older-than P30D  # ISO 8601 still works

Supported units: d (days), w (weeks), M (months), y (years), h (hours), m (minutes), s (seconds)

Includes 35 new tests covering normalization, parsing, and edge cases.

Original prompt

Update the prune command to accept human friendly values for 'older-than' that normalize to ISO 8601 format.

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[github-actions]

🌳 Grove PR Build Ready!

Version: 0.0.0-pr.24.56b2a4c

Install with:

curl -fsSL https://safia.rocks/grove/install.sh | sh -s -- --pr 24

Or if you already have grove installed:

grove self-update --pr 24

Or download directly from Actions Artifacts

Available binaries:

• grove-linux-x64
• grove-linux-arm64
• grove-darwin-x64
• grove-darwin-arm64