Overview input content clips client-side

Minor Changes

• 5c6b819: Add --max-content-chars [n] to releases admin overview inputs. In --json mode it clips each selected[].content to at most n characters client-side before printing (bare flag defaults to 1000), leaving every other field — existingContent, media, totalAvailable, and the selected length itself — untouched. High-volume orgs emit 500K+ chars of full release content here (sentry's largest single release is ~125K), which exceeds the ~30K Bash stdout cap a Claude Code sub-agent reads through and gets silently truncated, so the overview would be generated from only the first few releases. The clip is purely client-side — the CLI still receives the full payload over the wire — so it removes that footgun without the multi-step jq workaround. Omitting the flag preserves today's full-content output.