context: norris_tasks anchor + task-hint composition + reset clear

Phase 10 C2. Three additive changes; no regression.

- compose_norris_task_hint(self) — module-scope helper. Returns ""
  when norris_tasks is nil OR list empty OR current pointer past
  end. Otherwise returns "\n\nCurrent step k/N:\n    <task text>".

- Context:to_messages appends the hint AFTER the NORRIS suffix,
  inside the existing `if self.norris_active and self.norris_goal`
  branch. NORRIS_SUFFIX_TEMPLATE is UNCHANGED (R2 fix); the hint
  is a separate concatenation. Goal anchor stays the primary
  per-step instruction; task hint sharpens current focus.

- Context:reset() now clears self.norris_tasks (R6 fix). :reset is
  unreachable mid-Norris (planner runs without readline prompt),
  but if a Norris session crashed leaving stale state, :reset
  recovers cleanly. One line; defensive.

15 unit cases verified:
  - nil/empty/exhausted norris_tasks -> no hint block
  - current=1/3 -> "Current step 1/3" + task text in output
  - NORRIS suffix precedes hint (ordering preserved)
  - hint suppressed when norris_active=false even if tasks set
  - self.turns + self.norris_tasks table identity unmutated
  - Context:reset clears norris_tasks AND turns

Regression: 87/87 safety, 31/31 router_model, repl loads.

C2 isn't called from anywhere yet (ctx.norris_tasks is always nil
until C4 wires the preplan call). No behavior change in the live
tree until then.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

context.lua

@@ -228,6 +228,20 @@ The user will be prompted to confirm destructive actions; expect their
 verdict in the next turn as a synthesized "[aish] ... skipped by user"
 message if they declined.]]
 
+-- Phase 10 / #89: optional task-hint block appended AFTER the NORRIS
+-- suffix when the cloud preplanner emitted a TASK list at :norris
+-- launch. self.norris_tasks shape: { current = 1, list = {...} }.
+-- Returns "" when no tasks (preplan disabled OR preplan failed OR
+-- list exhausted) — keeps the NORRIS suffix backward-compatible.
+local function compose_norris_task_hint(self)
+    if not (self.norris_tasks and self.norris_tasks.list) then return "" end
+    local k = self.norris_tasks.current
+    local n = #self.norris_tasks.list
+    local task = self.norris_tasks.list[k]
+    if not task then return "" end  -- exhausted → no hint
+    return string.format("\n\nCurrent step %d/%d:\n    %s", k, n, task)
+end
+
 -- #87: route-aware context compression. Keeps the LAST keep_turns
 -- turns; tail-truncates any turn whose content exceeds max_turn_chars.
 -- Drops tool turns at the slice head (they'd be orphaned without
@@ -285,6 +299,7 @@ function Context:to_messages(opts)
     if self.norris_active and self.norris_goal then
         sys_content = sys_content
             .. string.format(NORRIS_SUFFIX_TEMPLATE, self.norris_goal)
+            .. compose_norris_task_hint(self)
     end
     local msgs = { { role = "system", content = sys_content } }
 
@@ -517,6 +532,11 @@ function Context:reset()
     self.turns = {}
     self.pending_exec_output = nil
     self.summary = nil
+    -- Phase 10 R6: clear norris_tasks defensively. :reset is
+    -- unreachable mid-Norris (no readline prompt while the planner
+    -- runs), but if a Norris session crashed leaving the field stale,
+    -- :reset gives the user a clean recovery path.
+    self.norris_tasks = nil
     -- R8 parity: usage_totals + cost_warn_state preserved (matches
     -- memory_items + project — "ambient context survives a user-
     -- driven conversation reset"). Use :reset_usage to zero the