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gsxdsm c1613ad7f6 FN-7122: expose MCP servers as pi session tools

Connect configured MCP servers during pi chat and agent session startup so their discovered tools are available as namespaced custom tools.

- Add MCP session tool connection, tool-name sanitization, result mapping, and disposal handling.
- Merge discovered MCP tools into pi customTools while skipping readonly sessions and avoiding secret-bearing logs.
- Cover MCP tool wrapping and pi session integration with targeted tests.
- Document MCP forwarding behavior and promote the MCP SDK to an engine runtime dependency.

Files changed:
 .changeset/fn-7122-mcp-session-tools.md            |   7 +
 docs/mcp.md                                        |   2 +
 packages/engine/package.json                       |   2 +-
 .../engine/src/__tests__/mcp-session-tools.test.ts | 105 ++++++++
 .../src/__tests__/pi-mcp-session-tools.test.ts     |  24 ++
 packages/engine/src/mcp-session-tools.ts           | 262 ++++++++++++++++++++
 packages/engine/src/pi.ts                          |  71 +++++-
 pnpm-lock.yaml                                     | 264 ++++++++++++++++++++-
 8 files changed, 713 insertions(+), 24 deletions(-)

Fusion-Task-Id: FN-7122

Fusion-Task-Lineage: e7ff57e7-9bfb-41a4-9ebd-6c868bac2745

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-06-27 14:09:47 -07:00