skillscript-runtime v0.8.0

Delivery model lockdown. Closes the v0.8.x delivery-model design (Perry/CC
threads 42a0cc41 → 6995d006 → ef5219a9 → bb34de4e → a39345f9,
May 26). Three substrate-portable output paths replace the v0.7.x
# Output: enum's implicit-substrate behavior:

1. Substrate writes — $ memory_write (NEW) + file_write (existing)
2. Programmatic return — result binding -> VAR (existing)
3. Direct agent alerting — notify() op (NEW) + # Output: agent: /
   template: lifecycle hooks (substrate-neutral, end-of-skill)

Auth model deferred for rethinking. The skill-author tracking + promotion
gate work settled in 43178c86 / 1866302d is kicked down the road per
Scott's call ("needs to be better thought out and perhaps made simpler").
$ memory_write ships with the current approved= lint gate (same as
file_write); # Status: Draft → Approved stays self-promotable.

Changed — OutputKind shape (breaking change; pre-adoption rule applies)

• prompt-context: renamed to agent:. The pre-v0.8.0 name leaned on
  substrate-specific "prompt-context" terminology that doesn't apply to
  Obsidian-vault-backed or mailbox-style agent substrates. agent: is
  substrate-neutral — "deliver to whoever's wired for X via their
  AgentConnector."
• # Output: agent: <name> → AgentConnector.deliver({kind: "augment", content: <joined-emissions>})
• # Output: template: <name> (unchanged) → AgentConnector.deliver({kind: "template", prompt: <joined-emissions>})
• Internal v0.7.x value prompt-context removed from the OutputKind union;
  internal output_kind discriminator in AgentDeliveryReceiptRecord
  similarly updated.
• Sweep across examples/*.skill.md, test fixtures, scaffold docs.

Added — notify() runtime-intrinsic op

• notify(agent, message?, connectors?) -> ACK dispatches mid-skill
  synchronous alerts via wired AgentConnector(s). Specialization vs the
  # Output: agent: end-of-skill lifecycle hook (per Perry's
  refactor-resistance argument: ordering puzzles dissolve when the
  end-of-skill hook owns emission accumulation and notify() owns
  mid-skill fires).
• Default behavior when message is absent: dispatches the accumulated
  emissions-so-far. Authors can write notify(agent="X") between emits to
  fire a checkpoint without manually constructing the message.
• Fan-out: dispatches to ALL wired AgentConnectors whose list_agents()
  includes the target agent. connectors=["webhook","tmux"] restricts.
• Failure semantics: best-effort by default. Per-connector errors are
  captured in the ACK's dispatched[] array but don't propagate. strict=true
  opt-in deferred to dogfooding signal (per Q3 lockdown).
• Return shape (signature lock): {agent: string, dispatched: Array<{connector: string, ok: boolean, error?: string}>}. Fire-and-forget
  callers ignore the binding; check-delivery callers inspect ACK.
• Substrate-neutrality: nothing bundled. Adopters wire AgentConnector
  impls (webhook, tmux, Slack, Discord, etc.). Substrate-specific delivery
  destinations live in adopter-wired AgentConnectors, NOT in the language.
• Closed-set RUNTIME_INTRINSIC_FN_NAMES expanded with "notify".

Added — tier-2 # Output: lint contract warns

• output-agent-target-no-emit — # Output: agent: X / template: X
  declared but skill has no emit() ops in body; delivery would fire with
  empty content. Warns to surface contract drift.
• output-agent-target-no-connector — # Output: agent: X / template: X
  declared but no AgentConnector wired; delivery would silently no-op via
  the NoOp default. Warns when lint context provides registry info.
• Per Q4 lockdown: tier-3 advisories for "header + notify(agent=X) both fire"
  deferred to dogfooding signal (Perry's call — wait for real footgun
  evidence before adding the lint).

Added — $ memory_write op + MemoryStore.write() contract

• MemoryStore.write({content, tags?, recipients?, expires_at?, metadata?}) -> {id, created_at} — new method on the typed MemoryStore contract.
  Bundled SqliteMemoryStore implements via the existing upsert schema with
  generated UUIDs. Companion: onboarding-scaffold FileMemoryStore.write()
  implements via JSON file append.
• $ memory_write content="..." [recipients=[...]] [tags=[...]] [expires_at=N] [metadata={...}] -> R — bare-form MCP dispatch through
  the MemoryStoreMcpConnector bridge. Bridge dispatches on toolName:
  memory routes to query(); memory_write routes to write(). Bootstrap
  auto-registers the same bridge instance under both names.
• Returns {id, created_at} envelope (per Q6 ack-shape lockdown).
• recipients[] is a substrate-advisory hint — memory systems with alerting
  (AMP) act on it; systems without (Obsidian-vault) ignore. Skillscript
  doesn't enforce or implement alerting at the language layer.
• Memory handoff delivery channel (the third "first-class" path
  documented in QUICKSTART since v0.7.0) is now real, no longer paper.

Deferred to future v0.8.x or later

• Skill-author tracking + promotion gate. Per Scott (2026-05-26):
  "needs to be better thought out and perhaps made simpler." The
  43178c86 / 1866302d design is reopened for re-thinking. Possible
  simplification: promotion gate as operator-policy at the SkillStore layer
  rather than language-level identity tracking. Until then,
  # Status: Draft → Approved stays self-promotable as today.
• Drop unconfirmed-mutation lint + reframe # Autonomous: true as
  documentation. Pairs with the auth model rethink — under the current
  approach the lint is still load-bearing. Defer with auth.
• R7 cold-author harness for NFR-6 — queued post-v0.8.0; tests
  ops/filters/lint-rules extension surfaces against the new file layout.
• Portability stress-test scaffold — v1.0 gate prep; vector-DB memory +
  hosted-API LLM + webhook AgentConnector substrate combination.

Notes for cold authors

• # Output: prompt-context: X from v0.7.x skills is a parse error in
  v0.8.0. Rename to # Output: agent: X — pre-adoption rule applies (no
  external installed base; sweep your own test fixtures).
• notify() is for mid-skill alerts; # Output: agent: X is for end-of-skill
  bulk delivery. See docs/adopter-playbook.md for the lifecycle distinction.
• $ memory_write content="..." works against any MemoryStore impl that
  implements the typed write() contract. Bundled SqliteMemoryStore and
  the onboarding-scaffold FileMemoryStore both ship it.