Adds compression engine that collapses repeated sibling lines (≥30 items
with same indent + role prefix) into head + summary + tail, preserves
[ref=eXX] anchors required by Playwright/computer-use MCPs, and
hard-truncates oversized text with a navigation hint footer.
Reduces token usage 60-80% on browser snapshots/accessibility trees from
external MCP servers (playwright-mcp, chrome-mcp). Configurable via
settings.compression.mcpAccessibility namespace.
Changes:
- open-sse/services/compression/engines/mcpAccessibility/: new engine
(constants.ts, collapseRepeated.ts, index.ts with smartFilterText)
- open-sse/services/compression/types.ts: re-exports McpAccessibilityConfig
- src/lib/db/compression.ts: getMcpAccessibilityConfig/setMcpAccessibilityConfig
- src/lib/db/migrations/056_mcp_accessibility_compression.sql: default settings
- open-sse/mcp-server/server.ts: apply filter to all tool result text blocks
- tests/unit/compression/mcpAccessibility.test.ts: 4 unit tests
- tests/unit/mcp/serverSmartFilter.test.ts: 4 integration tests (DB getter/setter)
Ref: 9router/src/lib/mcp/stdioSseBridge.js:14-90 (algorithm origin).
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