docs(container-runner): sync deploy docs with runner source

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Stack for rivet-dev/rivet

• #5557 docs(container-runner): sync deploy docs with runner source 👈
• #5556 fix(container-runner): read cgroup v1 memory usage under gvi …
• #5548 feat(container-runner): log version and git sha at actor sta …
• #5549 feat(container-runner): setup instance memory and cpu usage …
• #5546 fix(rivetkit): keep actor event loop alive through shutdown …
• #5539 feat(container-runner): report actors as crashed on unexpect …
• #5536 feat(container-runner): log unexpected platform SIGTERM as a …
• #5530 fix(rivetkit-core): cancel driver alarm before sqlite teardo …
• #5531 feat(container-runner): keep instance warm instead of self-e …
• #5533 chore(container-runner): default stop grace to 10s
• #5528 fix(rivetkit): log and surface actor startup failures
• #5529 fix(rivetkit): treat empty actor input bytes as absent
• #5558 fix(sdks): drop rivet-util metrics dep from protocol crates …
• main

Get stack: forklift get 5557
Push local edits: forklift submit
Merge when ready: forklift merge 5557

_{change nxplusuw}

[claude]

Review

Docs-only change syncing website/src/content/docs/deploy/container-runner.mdx with the current container-runner source. I cross-checked every changed value against container-runner/src/main.rs and container-runner/src/input.rs:

• --stop-grace-secs default 25 → 10: matches default_value_t = 10 on stop_grace_secs (main.rs:290).
• New RIVET_SIGTERM_BUDGET_SECS row (default 10): matches SIGTERM_BUDGET's unwrap_or(10) (main.rs:111-118), and the description ("splits this budget across the engine drain, the child stop grace, and a straggler sweep") accurately reflects signal_drain_timeout (60%), signal_child_stop_grace (40%), and SIGNAL_SWEEP_GRACE (main.rs:120-128).
• New input.port field and its description ("overrides the child's listen port ... falling back to --child-port when omitted") matches the ActorInput.port doc comment in input.rs verbatim.
• The wording change from "Capped to a few seconds" → "Capped to a fraction of the platform's SIGTERM budget" is a more precise and still-correct description of effective_stop_grace().

No functional code is touched, and the doc text follows the house style (no em dashes, complete sentences). Nothing to flag — this is a straightforward, well-verified accuracy fix.