feat: Azure billing + PR pricing, agent multi-turn memory, dashboard chat

[Cro22]

Implements the three high-ROI items from the improvement report ("Hazlo" block), each mirroring an existing pattern in the codebase.

1. Azure Cost Management (real billing)

CostManagementSource against the Azure Cost Management Query API, closing multi-cloud billing alongside AWS Cost Explorer and GCP BigQuery. Same injectable-interface + normalized Report + SourceError shape as the siblings.

• Enable with CLOUDORACLE_BILLING_PROVIDER=azure_cost_management + AZURE_SUBSCRIPTION_ID; noisy snapshot fallback on init failure.
• Skipped: NextLink pagination (a monthly service-grouped query is a few dozen rows).

2. Azure in the PR pricing analyzer (v2)

Extends the pre-merge Terraform estimator to Azure via an embedded static price table (the same choice the GCP arm makes; the Azure Retail Prices API is the documented upgrade path).

• New internal/iac/azure extractor for azurerm_linux_virtual_machine and azurerm_managed_disk; estimators in internal/pricing.
• Unpriced sizes/SKUs and Windows VMs surface as Skipped, not errors. Premium/Ultra disks are approximated (they bill by tier, not linearly) — flagged in-code.

3. Agent multi-turn memory (LangGraph PostgresSaver)

POST /ask takes an optional thread_id; when DATABASE_URL is set the supervisor graph compiles with AsyncPostgresSaver so a thread's prior messages carry into follow-ups ("and the month before?").

• Per-run accounting channels (tool_calls/observations/hops) are plain LastValue, not accumulating, so the run-wide caps reset each turn instead of tripping on the whole thread's history; the synthesizer scopes its question+findings to the current turn. No DB configured keeps single-shot behavior.

4. Dashboard chat widget

Floating chat panel wired to the agent's /ask with a per-conversation thread_id, surfacing the whole insights-agent to dashboard users. Dev proxies /ask to :8099; VITE_AGENT_BASE_URL / VITE_AGENT_API_KEY for prod.

Tests

• Go: go test ./... green (new billing, pricing, iac/azure, and change-dispatch tests).
• Python: 143 passed, 89% coverage (multi-turn thread test proves context persists and caps reset per turn; API thread_id forwarding).
• Web: eslint clean on new code, vite build succeeds.

New deps: armcostmanagement (Go), langgraph-checkpoint-postgres (Python).

🤖 Generated with Claude Code

[github-actions]

💰 Cloud Cost Impact

Net monthly change: +$630.11 🔴

This plan adds 4 resources, with a net monthly cost increase of +$630.11.

Top movers by cost impact

Resource	Action	Δ Monthly	Confidence
google_compute_instance.batch	🆕 create	+$231.96	low
google_sql_database_instance.main	🆕 create	+$219.36	medium
google_compute_instance.web	🆕 create	+$158.79	medium
google_compute_disk.data	🆕 create	+$20.00	medium

📋 Full breakdown (4 priced, 1 skipped)

Created (4)

• google_compute_instance.batch — +$231.96
  • Compute: +$226.96
  • BootDisk: +$5.00
• google_sql_database_instance.main — +$219.36
  • Compute: +$202.36
  • Storage: +$17.00
• google_compute_instance.web — +$158.79
  • Compute: +$141.79
  • BootDisk: +$17.00
• google_compute_disk.data — +$20.00
  • Disk: +$20.00

Skipped (1)

• google_storage_bucket.assets (google_storage_bucket) — unsupported resource type: google_storage_bucket

⚠️ Assumptions and caveats

• 1 resources skipped (1 unsupported types, 0 estimation failures)
• Net cost increase this plan
• Priced from a static GCP price table (may drift from current list price) (applies to: google_compute_instance.batch, google_compute_instance.web, google_compute_disk.data)
• Spot/preemptible VM priced at on-demand rate (real cost is 60–91% lower) (applies to: google_compute_instance.batch)
• Priced from a static GCP price table at US rates (may drift; other regions differ) (applies to: google_sql_database_instance.main)
• REGIONAL (HA) availability doubles compute and storage (applies to: google_sql_database_instance.main)

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_{Generated by CloudOracle · Confidence: low}