skillscript-runtime v0.18.3

Docs-only ring. The v0.18.1 declarative-wiring symmetry and v0.18.2
contract robustness landed without updates to the adopter-facing
surfaces; substrate-authors reading the playbook saw stale information
about the wake-shape, no agent@session convention, and no
graceful-degradation rule. This ring closes that gap so the adopter
walking up to v0.18.x sees a coherent picture across configuration,
contract, playbook, and worked example.

What changed

• docs/configuration.md — substrate slot table covers
  agent_connector (short-form "noop", per-type config row,
  null-explicit example). Programmatic-opts precedence section names
  the four slots symmetrically. Custom-form section shows
  AgentConnector alongside SkillStore.
• docs/connector-contract-reference.md — AgentConnector section
  documents:
  • DeliveryReceipt.session_id? field
  • New WakeOpts + WakeReceipt subsection with woken: boolean
    required + session_id? echo
  • agent@session targeting convention with Form A (composite in
    agent_id) + Form B (structured WakeOpts.session_id)
  • Graceful-degradation table distinguishing capability-gap
    (degrade) from operational-fault (throw)
  • Implementation-checklist item 3 (wake) updated for degradation
    • session honoring
• docs/adopter-playbook.md — new "Wiring the AgentConnector"
  section: two wiring paths (programmatic + declarative),
  precedence rules, worked example pointer, three copy-when-forking
  patterns (agent@session opaque composite, graceful wake
  degradation, session echo on receipts), fork-vs-write-fresh
  guidance.
• examples/connectors/HttpWebhookAgentConnector/README.md —
  wake_url config field updated for degradation behavior,
  DeliveryReceipt inbound shape includes session_id, new
  "Wake — capability gap vs. operational fault" table, new
  "agent@session targeting" section with cross-link to the
  contract reference.

No code changes; package-shipped docs (files array) auto-include
the updates on next publish.

Why a docs-only ring

The contract+impl are done. The block was discoverability: substrate-
author writing an AgentConnector against v0.18.2 without updated
adopter docs would either miss the new requirements or have to read
the diff. Per Phase-1-briefing-scope discipline: docs are part of the
adoption-readiness atom, not a follow-up.

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