* fix(integrations): declare PiIntegration multi_install_safe
PiIntegration writes only to its isolated, static root .pi/prompts,
disjoint from every other integration, yet never declared
multi_install_safe — so it inherited the IntegrationBase default False,
leaving `specify integration status` in a permanent unsafe-multi-install
ERROR state when pi is co-installed alongside another agent.
Add `multi_install_safe = True`, mirroring the isolated MarkdownIntegration
cohort (qwen, shai, qodercli) and the kiro-cli #3471 fix. The parametrized
registry isolation contracts auto-include pi and pass.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* docs(integrations): list pi in the multi-install-safe reference table
Declaring PiIntegration multi_install_safe means the reference table in
docs/reference/integrations.md (which states it lists all currently
declared multi-install-safe integrations) should include it. Add the
alphabetized pi row with its .pi/prompts isolation path.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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