Raise tracker agent max turns to avoid errors

The tracker-mapping and common-pattern enrichment agents ran with
4 and 3 max turns. Those budgets are smaller than the tool-call
rounds their prompts authorize (two/one DB searches plus up to
three web searches) plus the forced structured-output synthesis
turn, so the run loop tripped MaxTurnsExceededError before it
could emit JSON.

Raise the budgets to 10 across every layer that drives them: the
bootstrap env-var defaults, the Helm chart values and production
example, and the in-code fallback. Update the bootstrap test
defaults to match.

Revert the prompt instructions that told the model to reserve a
turn for its final answer; the model cannot reliably count its
remaining turns, so the fix belongs in the turn budget rather
than the prompt text.

Signed-off-by: Émile Ré <emile@probo.com>

pkg/bootstrap/builder_test.go

@@ -225,12 +225,12 @@ func TestBuilder_Build_Defaults(t *testing.T) {
 	assert.Equal(t, 3, cfg.Probod.TrackerMappingWorker.MaxConcurrency)
 	assert.Equal(t, 600, cfg.Probod.TrackerMappingWorker.StaleAfter)
 	assert.Equal(t, 45, cfg.Probod.TrackerMappingWorker.AgentTimeout)
-	assert.Equal(t, 4, cfg.Probod.TrackerMappingWorker.AgentMaxTurns)
+	assert.Equal(t, 10, cfg.Probod.TrackerMappingWorker.AgentMaxTurns)
 	assert.Equal(t, 10, cfg.Probod.CommonPatternEnrichmentWorker.Interval)
 	assert.Equal(t, 2, cfg.Probod.CommonPatternEnrichmentWorker.MaxConcurrency)
 	assert.Equal(t, 600, cfg.Probod.CommonPatternEnrichmentWorker.StaleAfter)
 	assert.Equal(t, 45, cfg.Probod.CommonPatternEnrichmentWorker.AgentTimeout)
-	assert.Equal(t, 3, cfg.Probod.CommonPatternEnrichmentWorker.AgentMaxTurns)
+	assert.Equal(t, 10, cfg.Probod.CommonPatternEnrichmentWorker.AgentMaxTurns)
 
 	// Custom domains config
 	assert.Equal(t, 3600, cfg.Probod.CustomDomains.RenewalInterval)