feat(reason): read-only tool registry, bounded loop and audit trail for unit 6 - #56
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…or unit 6 pkg/reason is the unit-6 core from design §9: a read-only tool registry, the reasoning loop, an audit trail, budget enforcement and injection defence. No SDK, no network, no go.mod change. Provider is an interface; the only implementation in-tree is a test fake. Write-capable tools are not merely unregistered — the type makes them unregisterable, so adding one requires editing Register's predicate in a visible diff. Every string a tool returns is attacker-controlled and is treated as such against an adversarial corpus. The budget bounds the loop, not the individual call: budget exhaustion is a first-class terminal outcome carrying partial evidence, so callers must not infer success from err == nil. airgap_test.go parses the package's own AST to seal its import set rather than tracking a maintained list. Co-authored-by: kording <74226694+kording@users.noreply.github.com>
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pkg/reason is the unit-6 core from design §9: a read-only tool registry, the
reasoning loop, an audit trail, budget enforcement and injection defence.
No SDK, no network, no go.mod change. Provider is an interface; the only
implementation in-tree is a test fake. Write-capable tools are not merely
unregistered — the type makes them unregisterable, so adding one requires
editing Register's predicate in a visible diff. Every string a tool returns is
attacker-controlled and is treated as such against an adversarial corpus.
The budget bounds the loop, not the individual call: budget exhaustion is a
first-class terminal outcome carrying partial evidence, so callers must not
infer success from err == nil. airgap_test.go parses the package's own AST to
seal its import set rather than tracking a maintained list.