docs(architecture): resolve review #002 Tiers 1-3 — mechanical and consistency fixes

Governance (Tier 2):
- Advance ADR-022 and ADR-023 from Proposed to Accepted (specs already
  depend on their types as source of truth)
- Amend ADR-015: mark Decision 3 and Assumption 6 as superseded by ADR-022;
  update handler_identity type to CompositionAuthority
- Amend ADR-002: note handle() signature revised by ADR-007 (BiStream → Connection)
- Amend ADR-004: note 'enrich/replace' AuthContext language superseded by
  ADR-011's immutability model; update to describe set_identity on Connection
- Update main README ADR table to show ADR-022/023 as Accepted

Spec-ADR consistency (Tier 3):
- Add abort_policy: AbortPolicy field to OperationContext struct (ADR-016
  Decision 6 mandated this but the spec omitted it)
- Define AbortPolicy enum (AbortDependents | ContinueRunning) with Default impl
- Add abort_policy to build_root_context and LocalOperationEnv::invoke()
- Define the OperationEnv trait explicitly with invoke() and
  invoke_with_policy() methods (was referenced as 'must remain a trait'
  but never defined)
- Specify From<StreamError> for HandlerError impl with exact variant mapping
- Add Connection::from_quinn() / from_iroh() constructors (was referenced
  as Connection::new() but never defined)
- Remove undefined CertAuthorityEntry placeholder from AuthPolicy v1 (will
  be added additively when alknet-ssh lands)
- Fix config.md key-differences table: rate limits are in DynamicConfig,
  not StaticConfig

Mechanical fixes (Tier 1):
- overview.md: 'closes the QUIC stream' → 'closes the connection' (stale
  from pre-ADR-007 model)
- overview.md: OQ-04 entry updated from stale 'defer to implementation'
  to 'resolved: static at startup'
- mnemonic-derivation.md: remove duplicate helper functions block (incomplete
  first copy, complete second copy)
- ADR-003: add iroh (feature-gated) to alknet-core dependency list, added
  by ADR-010
- ADR-021: fix ambiguous 'W1 drift issue from the vault review' cross-reference
- ADR-022: rephrase FromCall 'leaf locally' to 'leaf in the local registry'
- ADR-017: add error_schemas to from_call mirror list and services/schema
  step (inconsistency with ADR-023)
- ADR-016: fix self-referential citation ('ADR-016 Assumption 5' → 'Assumption 5')
- Add ScopedOperationEnv::empty(), allows(), new() and
  CompositionAuthority::none(), new() impl blocks (referenced but undefined)
- Add call.completed clarification for non-subscription calls
- Add services/schema leading-slash normalization note
- Crate README ADR tables: add missing ADR-013 (call), ADR-015 (core),
  ADR-006 + ADR-010 (vault)
- Vault README: add consolidated 'Known Source Drift' table tracking all
  four drift items (OsRng, unwrap, CURRENT_KEY_VERSION, spawn bug) in one
  place, including the two previously missing from README

docs/architecture/crates/vault/mnemonic-derivation.md

@@ -1,6 +1,6 @@
 ---
 status: draft
-last_updated: 2026-06-19
+last_updated: 2026-06-22-19
 ---
 
 # Mnemonic and Key Derivation
@@ -201,6 +201,7 @@ Helper functions construct parameterized paths:
 ```rust
 pub fn device_path(index: u32) -> String;           // m/74'/0'/0'/{index}'
 pub fn site_password_path(site_hash: &str) -> String; // m/74'/1'/0'/{site_hash}'
+pub fn encryption_path_for_version(version: u32) -> String; // m/74'/2'/0'/{version-2}'
 ```
 
 ### Path semantics
@@ -214,14 +215,6 @@ pub fn site_password_path(site_hash: &str) -> String; // m/74'/1'/0'/{site_hash}
 | `m/74'/2'/0'/0'` | Encryption key for external credentials | AES-256-GCM | Credential encryption (v2, see [encryption.md](encryption.md)) |
 | `m/44'/60'/0'/0/0` | Ethereum signing key | secp256k1 | Ethereum signing (feature-gated) |
 
-Helper functions construct parameterized paths:
-
-```rust
-pub fn device_path(index: u32) -> String;           // m/74'/0'/0'/{index}'
-pub fn site_password_path(site_hash: &str) -> String; // m/74'/1'/0'/{site_hash}'
-pub fn encryption_path_for_version(version: u32) -> String; // m/74'/2'/0'/{version-2}'
-```
-
 `encryption_path_for_version` maps a key version to its derivation path
 (ADR-021). v2 (current) maps to `m/74'/2'/0'/0'` (which is `PATHS::ENCRYPTION`);
 v3 maps to `m/74'/2'/0'/1'`; etc. This is the rotation mechanism — each