feat: Add guild charters and task boards for various components

- Introduced guild charters for Scanner Deno, PHP, Ruby, Native, WebService, Java, Surface.Env, Surface.FS, Surface.Secrets, Surface.Validation, UI, Zastava Observer, Zastava Webhook, Zastava Core, and Plugin Platform.
- Each charter outlines the mission, scope, required reading, and working agreements for the respective guilds.
- Created task boards for Surface.Env, Surface.FS, Surface.Secrets, Surface.Validation, and Zastava components to track progress and dependencies.
- Ensured all documents emphasize determinism, offline readiness, security, and integration with shared Surface libraries.

src/Zastava/StellaOps.Zastava.Observer/TASKS.md

@@ -2,5 +2,8 @@
 
 | ID | Status | Owner(s) | Depends on | Description | Exit Criteria |
 |----|--------|----------|------------|-------------|---------------|
+| ZASTAVA-SURFACE-01 | TODO | Zastava Observer Guild | SURFACE-FS-02 | Integrate Surface.FS client for runtime drift detection (lookup cached layer hashes/entry traces). | Observer validates runtime vs cache; integration tests cover drift + cache-miss cases. |
+| ZASTAVA-ENV-01 | TODO | Zastava Observer Guild | SURFACE-ENV-02 | Adopt Surface.Env helpers for cache endpoints, secret refs, and feature toggles. | Observer configuration centralised; misconfiguration warnings logged; docs updated. |
+| ZASTAVA-SECRETS-01 | TODO | Zastava Observer Guild, Security Guild | SURFACE-SECRETS-02 | Retrieve CAS/attestation access via Surface.Secrets instead of inline secret stores. | Secrets resolved through shared provider; rotation/resilience tests pass. |
 
 > 2025-10-24: Observer unit tests pending; `dotnet restore` requires offline copies of `Google.Protobuf`, `Grpc.Net.Client`, `Grpc.Tools` in `local-nuget` before execution can be verified.