Diagnose excessive expression nesting before host-stack exhaustion

[julia-script]

Summary

• bound parser expression nesting at 256 edges and emit structured PAR0005 diagnostics at the first over-budget child
• recover over-budget regions iteratively while preserving token identity, byte reconstruction, following syntax, and analysis-facade queryability
• document and test boundary, deep-shape, recovery-cardinality, determinism, and defect-isolation behavior
• sync all four OpenSpec deltas into the main specs and archive diagnose-excessive-expression-nesting

Validation

• openspec validate diagnose-excessive-expression-nesting --strict (before archive)
• openspec validate --specs — 124 passed
• pnpm typecheck
• pnpm exec biome check .
• pnpm test
• pnpm check
• pnpm release:candidate
• git diff --check

Note

openspec validate --all --strict reports the unchanged add-silk-documentation-consumers active change because one unrelated ADDED requirement has no scenario. That file is identical to origin/main; all main specs and the archived JUL-29 change validate.

Tracks JUL-29.

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Project	Deployment	Actions	Updated (UTC)
silk-effect-docs	Ready	Preview	Aug 29, 2026 9:24pm