fix: cross-module stdlib imports (ADR-011) + module builtin seeding (#135)

[hyperpolymath]

Implements the ruled ADR-011 model (explicit use module::{...}) and fixes the systemic resolver/typecheck bug that made any stdlib file with an import fail.

Root cause (3 coupled defects):

1. resolve_and_typecheck_module built a bare context with no builtin seeding → imported modules failed resolution (UndefinedVariable "len"). Fixed by factoring seed_builtins and calling it there.
2. Same path's manual check_decl fold skipped Typecheck.register_builtins → Unbound variable: len at typecheck. Now called.
3. register_builtins missing eprint/eprintln (resolver seeds them).
   Plus pub on string.split/join + use string::{ split, join }; in io.

Result: io.affine's cross-module import now resolves end-to-end. io's remaining typecheck error is a separate pre-existing register_builtins drift (file-I/O family + read_line typed as String not Result) — out of scope here, documented for follow-up.

Verification: full suite 233/233, zero regression; stdlib sweep 12/19 (io advanced resolve→typecheck, no green file regressed).

Refs #128

[github-actions]

🔍 Hypatia Security Scan

Findings: 44 issues detected

Severity	Count
🔴 Critical	12
🟠 High	21
🟡 Medium	11

⚠️ Action Required: Critical security issues found!

View findings

[
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    "severity": "high"
  },
  {
    "reason": "Superseded by 0-AI-MANIFEST.a2ml",
    "type": "banned",
    "file": "AI.djot",
    "action": "delete",
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    "severity": "high"
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  {
    "reason": "Issue in quality.yml",
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    "action": "create",
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    "severity": "high"
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  {
    "reason": "Issue in security-policy.yml",
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    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
    "type": "unpinned_action",
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    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
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  {
    "reason": "TypeScript file detected -- banned language",
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    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/example/smoke_driver.ts",
    "action": "flag",
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    "severity": "critical"
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  {
    "reason": "TypeScript file detected -- banned language",
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    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/cli.ts",
    "action": "flag",
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  {
    "reason": "TypeScript file detected -- banned language",
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    "action": "flag",
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    "severity": "critical"
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  {
    "reason": "TypeScript file detected -- banned language",
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    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/lib/compile.ts",
    "action": "flag",
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  {
    "reason": "TypeScript file detected -- banned language",
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    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/lib/runner.ts",
    "action": "flag",
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]

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