docs: align FlowForge architecture with the durable runtime

[mkarson1997]

What changed

• replace the stale architecture note that described PostgreSQL durability as a future milestone
• document the current in-process DAG + PostgreSQL state + durable queue + worker architecture
• add explicit invariants for scheduling, retries, idempotency, leases, fencing and at-least-once delivery
• add recruiter-facing engineering proof points and security/delivery controls to the README

Why

FlowForge's implementation has moved beyond the old architecture document. The repository should describe what is actually implemented today and expose the strongest distributed-systems evidence clearly.

No runtime behavior changes.

Summary by Sourcery

Align the project documentation with the implemented durable runtime and make its distributed-systems guarantees and engineering controls explicit.

Enhancements:

• Document the current in-process DAG, PostgreSQL state, durable queue, and worker architecture, including scheduling, retry, idempotency, lease, fencing, and delivery invariants.
• Clarify durable work distribution, at-least-once delivery semantics, observability boundaries, and intentional non-claims.
• Surface engineering proof points and security and delivery controls in the README.

Documentation:

• Align the architecture documentation with the implemented durable runtime and its failure guarantees.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sourcery-ai]

Reviewer's Guide

Documentation is aligned with the implemented FlowForge durable runtime: the architecture now explains the in-process DAG and PostgreSQL-backed worker system with explicit invariants and delivery guarantees, while the README highlights engineering proof points and CI/security controls. No runtime behavior is changed.

Sequence diagram for durable work claiming and recovery

sequenceDiagram
    participant Worker as DurableWorker
    participant Queue as DurableWorkQueue
    participant DB as PostgreSQL
    participant Handler as TaskHandler

    Worker->>Queue: register
    Worker->>Queue: heartbeat
    Worker->>Queue: claim work
    Queue->>DB: acquire expiring lease
    Queue-->>Worker: leased work
    Worker->>Handler: execute task
    alt task succeeds
        Worker->>Queue: complete work
        Queue->>DB: record terminal state
    else worker disappears
        Queue->>DB: reclaim expired lease
        Queue->>DB: retry with row locking
    end

Loading

File-Level Changes

Change	Details	Files
Replaces the outdated architecture description with a current durable-runtime model and explicit distributed-systems guarantees.	Adds a system-view diagram covering DAG validation, layered execution, state stores, durable queue, workers, handlers, and observability. Documents scheduling, failure boundaries, retries, cancellation, idempotency, durable state, leases, fencing, crash recovery, delivery semantics, and observability invariants. Describes PostgreSQL-backed state and queue behavior, including locked retry transitions, dead-lettering, and lease reclamation. Removes future-milestone language and states deliberate non-claims such as exactly-once external effects and forcibly terminating arbitrary JavaScript.	docs/architecture.md
Adds recruiter-facing engineering evidence and clarifies security and CI delivery controls in the project README.	Adds proof points for workflow semantics, failure handling, durable state, worker coordination, concurrency, idempotency, delivery, observability, verification, and supply-chain security. Updates architecture-documentation wording to emphasize current durable-runtime semantics. Adds security and delivery controls covering PostgreSQL-backed CI verification, lifecycle-script restrictions, aggregate CI gating, CodeQL, immutable action pinning, and telemetry data boundaries.	README.md

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