feat: -filters --json (machine-readable filter list)#45
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Closes #25. Adds `imgcli -filters --json`, emitting a JSON array of {name, syntax, description} per filter so agents/build tools can enumerate and validate the available filters programmatically. Generated from the FILTERS[] registry, so it's always in sync with the binary. - filters.c: filters_print_json() + split_usage() (splits each usage string into syntax + description on the first 2+ space run). - Moved the JSON string escaper (json_str) from main.c to util so filters.c can share it (no duplication). - main.c: -filters dispatches to the JSON printer when --json is set (order- independent). - AGENTS.md/README documented; `make check` now validates the JSON output. Verified: valid JSON, 29 entries matching the human list, ASan/UBSan clean. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Closes #25.
imgcli -filters --jsonemits[{"name","syntax","description"}, ...]so agents/tools can enumerate + validate filters programmatically — generated from the registry, always in sync with the binary.util(shared, no dup);-filtersdispatches on--json(order-independent).make checknow validates the JSON.Per #25's decision: minimal name/syntax/description (no registry-wide param metadata).
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