build(manifest): land wave-1 dependency set and ADR-003 feature graph

- russh = "0.65", default-features off, aws-lc-rs only (ADR-002:
  no flate2, no rsa; tree RC-free except the recorded ssh-key
  0.7.0-rc.11 pin riding the russh keys path)
- alkcall 0.10, alkvault 0.1 version-pinned; no path deps
- standing toolkit: tokio, thiserror, tracing, parking_lot, zeroize
- edition 2024, rust-version 1.89
- ADR-003 feature graph: session/git/tunnel/sftp, default = [],
  flat and independent — features gate nothing yet (wave-2
  decline core is the first consumer)
- task w1-manifest completed; notes/summary filled

Verified: cargo tree (no rsa/pkcs1/flate2), cargo test, cargo test
--all-features, cargo clippy --all-targets -- -D warnings (default +
all-features), cargo fmt --check, taskgraph validate

Cargo.toml

@@ -1,14 +1,14 @@
 # Single-crate protocol/door crate (the alktty template). No workspace:
 # the composition story is deferred — alkssh's substance is the mappings
-# (family ADR-003); the russh pin is decided (ADR-002: 0.65.0, aws-lc-rs).
+# (family ADR-003).
 [workspace]
 members = ["."]
 
 [package]
 name = "alkssh"
 version = "0.1.0"
-edition = "2021"
-rust-version = "1.88"
+edition = "2024"
+rust-version = "1.89"
 license = "MIT OR Apache-2.0"
 description = "SSH adapter for the alk family: russh-wrapped vanilla-ssh termination bridged to/from alkcall channels — session/pty, tunnels, git exec — with every capability mapping a fail-closed cargo feature (no features: no capabilities)"
 repository = "https://git.alk.dev/alkdev/alkssh"
@@ -24,20 +24,31 @@ exclude = [".opencode/", "AGENTS.md", "docs/reviews/", "docs/plans/", "docs/rese
 name = "alkssh"
 
 [features]
-# The capability feature graph (ADR-003) lands with implementation start:
-# session (→ alktty), tunnel (→ alktunnels), git (→ alkgit), sftp (→
-# alkfs, deferred placeholder). The default build carries no capabilities
-# by design — every mapping is opt-in and every unfeatured channel open
-# declines fail-closed.
+# ADR-003: flat and independent — no feature implies another; `default = []`
+# by design (a default build has no capabilities; every unfeatured open
+# declines fail-closed). Features gate nothing yet — the wave-2 decline core
+# is their first consumer; the per-feature sibling deps land with their
+# first consuming wave.
 default = []
+session = []
+git = []
+tunnel = []
+sftp = []
 
 [dependencies]
-tokio = { version = "1.54.1", features = ["full"] }
-# Deliberately empty until implementation start — the russh pin is decided
-# (ADR-002: 0.65.0, aws-lc-rs); russh + alkcall + sibling-crate deps land
-# with implementation.
+# ADR-002: aws-lc-rs only; default features off — no flate2, no rsa
+# (ed25519-only; the tree stays RC-free except the ssh-key pin riding the
+# russh keys path). Never enable russh's `des`/`dsa` features.
+russh = { version = "0.65", default-features = false, features = ["aws-lc-rs"] }
+alkcall = "0.10"
+alkvault = "0.1"
+tokio = { version = "1.54", features = ["full"] }
+thiserror = "2.0"
+tracing = "0.1"
+parking_lot = "0.12"
+zeroize = "1.9"
 
 [dev-dependencies]
 
 [profile.release]
-lto = "thin"
+lto = "thin"