Adopt spec v0.2: schema, semantic validator, operating modes; workplans updated

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Assistant: claude-code
Assistant-Model: sonnet
Assistant-Process: 295952@bnt-lap001
Assistant-Session: e93f64ad-516c-46eb-9666-aad8d300c477

runbooks/showcase-lighthouse/pack.v0.2.yaml

@@ -1,4 +1,4 @@
-# DRAFT - not loaded by the engine. Written against docs/pack-spec-v0.2-proposal.md.
+# DRAFT - not loaded by the engine. Written against docs/pack-spec-v0.2.md.
 # Purpose: an acceptance test for the proposed model. If the model cannot express
 # this story without special cases, the proposal must change. When v0.2 is adopted
 # this file becomes pack.yaml (and the v0.1 file is retired or kept as a
@@ -55,6 +55,7 @@ stages:
         produces: [lamp_lit]
         command: echo "{{keeper_name}} lights the {{lamp_fuel}} lamp."
         reversible: true
+        downstream_risk: Without a lit lamp the night watch has no purpose and ships are not warned.
         verify: {done_when: The lamp is lit, expect: manual}
       - id: read-the-sky
         title: Read the sky
@@ -69,6 +70,8 @@ stages:
         title: The lamp burns steadily
         goal: safe-navigation           # quality objective; a canon standard id where one exists
         blocking: true
+        timeout: {seconds: 120, on_timeout: stop}
+        downstream_risk: Ships may steer by a light that is not burning.
         checks:
           - {done_when: The light is visible from the water, expect: manual}
           - {datapoints_ok: [lamp_lit]}
@@ -109,7 +112,7 @@ stages:
         owner: the-lighthouse
         requires: [warn]
         uses: [keeper_name, weather, lamp_fuel, motto, logdir]
-        produces: [logbook_file]
+        produces: [logbook-file]
         command: mkdir -p {{logdir}} && echo "Night watch by {{keeper_name}} - {{weather}}, {{lamp_fuel}} lamp. {{motto}}." >> {{logdir}}/logbook.txt
         reversible: true
         rollback: rm -rf {{logdir}}
@@ -122,6 +125,7 @@ stages:
     steps:
       - id: close-log
         title: Close the log for good
+        autopilot: manual-only     # never confirmed by the engine on its own
         actor: harbourmaster
         owner: the-lighthouse
         uses: [logdir]
@@ -137,7 +141,7 @@ stages:
           - {done_when: No files remain under the scratch folder, command: 'test ! -e {{logdir}}', expect: exit-0}
 
 artefacts:
-  - id: logbook_file
+  - id: logbook-file
     title: The night's logbook entry
     location: {datapoint: logdir, path: logbook.txt}   # a reference, never a value
     produced_by: write-logbook