feat(effect): function effect row + call-graph composition (ADR-0009 D1+D3)

[hyperpolymath]

(b) — the composition slice. Implements ADR-0009 D1+D3: the function effect row and its composition across calls.

• FunctionEffect { echo, epi } — a point in the product lattice Echo × Epistemic, joined componentwise.
• own_effect(func) — a function's effect from its body alone (function_echo + function_epistemic).
• resolved_effects(program) — joins in the effects of called functions, transitively, via a monotone fixpoint over the call graph. The effect lattice is finite (3×3) and join is monotone, so it terminates — recursion and mutual recursion included (pinned by a test).

This is the operational heart of "Echo+Epistemic compose through calls": it works over the existing AST via an effect environment, so no invasive AST-field changes (storing the grade on TypeAnnotation::Function for surface annotations/display is a later, optional slice).

4 tests: own-effect resolution; epistemic and echo composing through a call; recursion terminates. clippy -D warnings clean; #[forbid(unsafe_code)]; no unwrap_or.

(b) status after this: design (ADR-0009) ✓ · echo inference ✓ · epistemic inference ✓ · call composition ✓. Remaining (b): mechanise the function-effect lattice + composition law in JtvEcho.lean. Then number-systems.

https://claude.ai/code/session_01BJmfoz1ZS1Pejy9LLMY742

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[github-actions]

🔍 Hypatia Security Scan

Findings: 51 issues detected

Severity	Count
🔴 Critical	0
🟠 High	25
🟡 Medium	26

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