## Summary
Add CLI support for run parent relationships now that the server API can
store them. This lets users create child runs, filter children, inspect
parent metadata, and link or unlink parents without dropping to raw API
calls.
## What Changed
- Added top-level `fabro parent link` and `fabro parent unlink` commands
with selector resolution, text output, and JSON summaries.
- Added `--parent` to `fabro run`, `fabro create`, and `fabro ps`;
create/run send `parent_id` in manifests and `ps` uses server-side
parent filtering.
- Surfaced `parent_id` in `ps --json` and `inspect`, with a conditional
`PARENT` column for unfiltered tables.
- Extended `fabro-client` parent-link APIs and
`list_store_runs(parent_id)`.
## Test Plan
- `cargo nextest run -p fabro-cli`
- `cargo nextest run -p fabro-client`
- `cargo +nightly-2026-04-14 fmt --check --all`
- `cargo +nightly-2026-04-14 clippy -p fabro-cli -p fabro-client
--all-targets -- -D warnings`
- `cargo insta pending-snapshots`
- `git diff --check`
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