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Add Copilot skill architecture with 10 skills, 2 agents, and shared infra

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Introduce .github/skills/ with solve, prove, optimize, simplify,
encode, explain, benchmark, memory-safety, static-analysis, and
deeptest skills. Each skill follows a SKILL.md + scripts/ pattern
with Python scripts backed by a shared SQLite logging library
(z3db.py). Two orchestrator agents (z3-solver, z3-verifier) route
requests to the appropriate skills.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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---
name: optimize
description: Solve constrained optimization problems using Z3. Supports minimization and maximization of objective functions over integer, real, and bitvector domains.
---
Given a set of constraints and an objective function, find the optimal value. Z3 supports both hard constraints (must hold) and soft constraints (weighted preferences), as well as lexicographic multi-objective optimization.
# Step 1: Formulate the problem
The formula uses the `(minimize ...)` or `(maximize ...)` directives followed by `(check-sat)` and `(get-model)`.
Example: minimize `x + y` subject to `x >= 1`, `y >= 2`, `x + y <= 10`:
```smtlib
(declare-const x Int)
(declare-const y Int)
(assert (>= x 1))
(assert (>= y 2))
(assert (<= (+ x y) 10))
(minimize (+ x y))
(check-sat)
(get-model)
```
# Step 2: Run the optimizer
```bash
python3 scripts/optimize.py --file scheduling.smt2
python3 scripts/optimize.py --formula "<inline smt-lib2>" --debug
```
# Step 3: Interpret the output
- `sat` with a model: the optimal assignment satisfying all constraints.
- `unsat`: the constraints are contradictory; no feasible solution exists.
- `unknown` or `timeout`: Z3 could not determine optimality.
The script prints the objective value and the satisfying assignment.
# Parameters
| Parameter | Type | Required | Default | Description |
|-----------|------|----------|---------|-------------|
| formula | string | no | | SMT-LIB2 formula with minimize/maximize |
| file | path | no | | path to .smt2 file |
| timeout | int | no | 60 | seconds |
| z3 | path | no | auto | path to z3 binary |
| debug | flag | no | off | verbose tracing |
| db | path | no | .z3-agent/z3agent.db | logging database |