feat(v0.6.0): CLI maturity — aligned tables, progress bars, retry, verbose logging

[ferhimedamine]

Summary

• Aligned table output (comfy-table v7): --format table now renders properly aligned columns with bold cyan headers instead of falling back to JSON pretty-print across all 14 command modules.
• Progress bar for bulk upsert (indicatif v0.17): dk vector upsert --file big.json shows a spinner, elapsed time, item count, and ETA for large batches.
• Verbose HTTP logging: --verbose flag now logs --> request and <-- response lines with elapsed milliseconds via the new Context struct.
• Exponential backoff retry (src/retry.rs): transient network errors retried up to 3 times with 100ms/500ms/2s delays; 4xx errors never retried.
• src/context.rs: new Context struct threads url, format, verbose through all command modules — eliminates per-call argument threading.
• src/cli.rs: all build_*_command() builder functions extracted from main.rs, reducing it from ~1,400 lines to ~125 lines.

CI Validation (x64 runner — 178.104.227.173)

cargo fmt --check   ✅ clean
cargo clippy -- -D warnings  ✅ 0 warnings
cargo test --workspace  ✅ 35 unit tests + 7 integration tests pass

Files Changed

• Cargo.toml: version 0.5.5 → 0.6.0, added comfy-table = "7" and indicatif = "0.17"
• src/main.rs: reduced from ~1,400 → ~125 lines (routing + init only)
• src/cli.rs (new): all build_*_command() functions
• src/context.rs (new): Context struct with log_request/log_response
• src/retry.rs (new): with_backoff() with 6 unit tests
• src/output.rs: render_table() with comfy-table
• All 14 command modules: updated to execute(ctx: &Context, matches) signature
• .gitignore: added *.db / ruvector.db
• CHANGELOG.md: v0.6.0 entry

Rollback Plan

git revert HEAD + redeploy — no DB migrations, no schema changes.

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