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Coding-agent plugins capped a tool part's `tool_output` at 2000 chars before
POSTing it to `/api/v1/sessions/{id}/messages`. That cap sits below the server's
own externalization threshold (`tool_output_externalization.threshold_chars`,
default 20000), so output in the 2k-20k band was destroyed for no reason and
anything larger never reached `ToolResultStore` - leaving `tool_output_ref`
permanently empty and the `/tool-results` read-back path unusable.
Raise the `captureToolMaxChars` default to 1000000 (a guard against pathological
payloads, not a truncation policy) and lift the opencode/pi clamps that would
otherwise pin it back to 20000. claude-code had no knob at all - two hardcoded
`TOOL_OUTPUT_PART_MAX_CHARS = 2000` constants - so it gains the same config
entry and both capture scripts now read it.
Also stop pi from sending tool output twice: for a tool-only payload the
rawText-derived text part re-rendered the same output the tool part carries.