Summary

Phase 3 of the decrating effort. Phase 2 is complete (13-crate target achieved on main), which means the remaining micro-* feature flags are no-op transitives — they gated the in-tree-vs-shim architecture-swap system, which is gone now that all absorbed microcrates have been physically removed. This PR deletes that dead weight.

Per docs/decrating-plan.md §6 Phase 3.

Changes

Cargo manifests

• crates/shipper-cli/Cargo.toml: removed default = ["micro-all"] and all micro-* feature passthrough entries; [features] section deleted entirely.
• crates/shipper/Cargo.toml: deleted micro-encrypt, micro-webhook, micro-types, micro-config, micro-all; [features] section deleted entirely.

CI

• .github/workflows/ci.yml: dropped the BDD feature-flag matrix (feature-set: ["", "micro-git", ...]); BDD job now runs a single canonical build.
• templates/circleci-config.yml: same cleanup.

Tests

• crates/shipper-cli/tests/bdd_micro_backends.rs: removed the #[cfg(feature = "micro-all")]-gated duplicate test; renamed the surviving module preflight_with_micro_backends → preflight_stability; rewrote the module preamble to reflect current reality.
• features/micro_backend_feature_flags.feature: deleted (the scenarios described behavior that no longer exists).

Docs

• docs/architecture.md: removed the Compile-Time Feature Flags feature-matrix block and the "optional composition via micro-*" bullet, replaced with a note about the canonical-single-path model.
• docs/testing.md: removed --features micro-git examples and the "BDD suites across all micro-backend feature combinations" note.
• docs/decrating-plan.md: marked Phase 3 complete with a concrete status block listing what landed.

Diff stat: 9 files changed, 43 insertions(+), 179 deletions(-).

Verification

• cargo check --workspace --all-targets — clean
• cargo clippy --workspace --all-targets --all-features -- -D warnings — clean
• cargo fmt --all -- --check — clean
• cargo build -p shipper-cli — clean
• cargo run -p shipper-cli -- --help / plan --help — responds correctly, no regression in CLI surface
• cargo test -p shipper — one pre-existing flake (ops::git::cleanliness::tests::ensure_git_clean_new_phrasing) reproduces identically on unmodified main; unrelated to this PR.
• cargo test -p shipper-cli — one pre-existing flake (e2e_expanded::preflight_allow_dirty_snapshot, network timing in the tiny_http mock) also reproduces on unmodified main; unrelated to this PR.
• grep '#\[cfg(feature = "micro' across the crates tree returns no matches.

Test plan

• CI green on PR
• Manual: cargo run -p shipper-cli -- plan against a sample workspace still works end-to-end
• Verify no downstream consumer in this repo references shipper-cli / shipper features