8re.t.mh0: continue forked assignments without manual nudges

[cs3b]

📋 Summary

Fork-heavy assignments can now keep moving without a user typing continue after every completed child subtree. Before this change, /as-assign-drive documented a run-until-done contract, but real execution still depended too much on conversational discipline, so finished fork children could leave the batch paused until the user nudged it forward again.

✏️ Changes

• ace-assign watch adds a deterministic runtime loop that waits on active fork sessions, recovers from assignment state after interruption, and immediately launches the next eligible fork subtree.
• /as-assign-drive now delegates fork wait/resume behavior to ace-assign watch instead of relying on prompt-level polling instructions.
• TS-ASSIGN-003 now covers the public operations suite on this branch, including a new watch-driven sequential continuation scenario alongside the existing multi-assignment and fork-run flows.
• 8re.t.mh0 draft specs capture the behavioral contract for permanent continuation and the reserved tmux callback handoff surface.
• ADR-034 records the watcher decision and the notification-only callback contract so later implementation keeps status as the source of truth.

📁 File Changes

+1290,   -46   23 files   total

 +722,   -46   18 files      ace-assign/
 +220,    -2    2 files   🧱 lib/
   +6,    -2                 ace/assign/cli.rb
 +214,    -0                 ace/assign/cli/commands/watch.rb
 +462,    -6   11 files   🧪 test/
  +23,    -0                 e2e/TS-ASSIGN-003-operations/TC-001-multi-assignment.runner.md
  +25,    -0                 .../TC-001-multi-assignment.verify.md
  +22,    -0                 .../TC-002-fork-run-delegation.runner.md
  +27,    -0                 .../TC-002-fork-run-delegation.verify.md
  +23,    -0                 .../TC-003-watch-sequential-continuation.runner.md
  +24,    -0                 .../TC-003-watch-sequential-continuation.verify.md
  +38,    -0                 .../runner.yml.md
  +32,    -0                 .../scenario.yml
  +37,    -0                 .../verifier.yml.md
 +205,    -0                 fast/commands/watch_command_test.rb
   +6,    -6                 fast/organisms/assign_drive_contract_test.rb
  +11,   -36    2 files   📚 handbook/
   +1,    -1                 skills/as-assign-drive/SKILL.md
  +10,   -35                 workflow-instructions/assign/drive.wf.md
  +29,    -2    3 files      
   +2,    -2                 README.md
   +1,    -0                 docs/getting-started.md
  +26,    -0                 .../usage.md

 +473,    -0    4 files      .ace-tasks/
 +125,    -0                 8re.t.mh0-harden-assignment-drive-continuation-and/0-spike-deterministic-ace-assign-watch/8re.t.mh0.0-spike-deterministic-ace-assign-watch-continuation.s.md
 +136,    -0                 8re.t.mh0-harden-assignment-drive-continuation-and/1-specify-tmux-callback-notification-contract/8re.t.mh0.1-specify-tmux-callback-notification-contract-for.s.md
 +153,    -0                 8re.t.mh0-harden-assignment-drive-continuation-and/8re.t.mh0-harden-assignment-drive-continuation-and-callback.s.md
  +59,    -0                 8re.t.mh0-harden-assignment-drive-continuation-and/ux/usage.md

  +95,    -0    1 files      ./
  +95,    -0                 docs/decisions/ADR-034-assignment-watch-and-callback-contract.md

🧪 Test Evidence

• ace-test in ace-assign passed with 549 tests, 1820 assertions, 0 failures, 0 errors, validating the new watcher command plus the updated drive contract coverage.
• ace-test feat in ace-assign passed with 2 tests, 46 assertions, 0 failures, 0 errors, validating the feature-level package flow after the watcher changes landed.

🎮 Demo

Run the watcher on a fork-heavy assignment:

ace-assign watch --assignment 8rddnp

Expected behavior:

• Waits while an active fork subtree is still running
• Recovers from assignment state if the previous fork session disappeared
• Launches the next eligible fork subtree immediately after child completion
• Stops only when the assignment is complete, blocked/failed, or only inline/manual work remains