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No blockers. Several findings below are mandatory-to-state-in-the-PR rather than merge blockers; one is a near-blocker I weighed carefully (§ \"Closest call\").\n\n## What I verified from the supplied material\n\n**The diff is exactly the approved delta, no more.** §5's patch touches two files. `rs/Cargo.toml`: `std = []` → `std = [\"hemera/std\"]` and `, default-features = false` appended to the hemera line. Nothing else — `nebu`, `cyber-lens-core`, `cyber-lens-brakedown`, `acpu`, `criterion`, `bench`, `[lib]`, version `0.2.0`, `license-file`, keywords all unchanged. §6's full final manifest corroborates the patch line by line; I reconstructed it from the §5 hunks against the implied parent and found no third change. The `CLAUDE.md` hunk appends after the existing \"do not touch zones\" tail at line 570+, and §7's full final file confirms it lands at the very end, with the pre-existing two bullets intact above it. §33 independently reports `production_files: 2`, `owning_rust_count: 48`, `all_source_before_after_equal: true`, and that the worktree diff equals the frozen patch hash `387f9cce…` — which matches §5's declared sha256. That is a closed loop on \"only the two intended files changed.\"\n\n**The causal claim is proven by raw compiler output, not narrative.** §44 (record 38, parent) fails with `E0463: can't find crate for std` at `hemera/rs/src/lib.rs:55 extern crate std;` while compiling `cyber-hemera v0.3.1`, before nox is reached. §12 shows line-level context: `#![no_std]`, `extern crate alloc`, then `#[cfg(feature = \"std\")] extern crate std;`. §11 shows Hemera's `default = [\"std\"]`. So the parent's nox edge unified `hemera/std` on and killed thumb codegen. §35 (record 72, candidate) is the same command, same target, exit 0, `Finished dev profile`, with `cyber-hemera v0.3.1` compiling cleanly. §45/§41 repeat the identical before/after in the *normalized package* epoch, where Hemera comes from the registry path (`/tmp/nox-no-std-registry/cyber-hemera-0.3.1/src/lib.rs:55`) rather than the sibling checkout. Two independent dependency domains, same fix, same result. This is `build`, not `check`, so monomorphization and codegen are exercised.\n\n**The feature-tree inverse is a real artifact, not a claim.** §37 (record 90, `--no-default-features`) prints exactly two lines: hemera and nox, with *no* `cyber-hemera feature \"std\"` node. §39 (record 91, `--features std`) prints the same tree plus `└── cyber-hemera feature \"std\"` ← `cyber-nox feature \"std\"`. That is the invariant the patch is supposed to establish, shown as a diff of two stdout bodies, with receipts (§36/§38) confirming both ran under `CARGO_TARGET_DIR=/tmp/nox-no-std-candidate-target`, `CARGO_BUILD_JOBS=2`, `CARGO_INCREMENTAL=0`, toolchain-bin PATH first, and the same manifest. §26 records 92/93/94 cover `parallel`/`brakedown`/`wgpu` on the candidate — the one place under-forwarding could hide — and §27 pairs each against parent records 69/70/71. The forwarding closure is sound from §6: each of those three features lists `\"std\"`, and `std` now lists `\"hemera/std\"`.\n\n**Behavior preservation is paired, not asserted.** §27 is the load-bearing document and it holds up: 161/161 owning tests debug (40↔74), release (41↔75), std (42↔76); 164/164 parallel (43↔77) and brakedown (44↔78); H264 4/4 debug and release in both sibling (16↔84, 50↔85) and package (98/99) domains; CLI build/test, wgpu check identical. Every row carries both receipt hashes and distinct `parent_target`/`candidate_target` paths, so these are not shared-target artifacts. §34's receipt shows the environment pinning the plan demanded (RUSTC/RUSTDOC absolute, PATH toolchain-bin first, offline, isolated CARGO_HOME).\n\n**The retained reds are labeled honestly, with one correctly-flagged imperfection.** fmt 58↔79 both exit 1, `normalized_stdout_equal: true`. Docs 47↔81: 25 error headings, listed in full, identical set and order. honeycrisp 56↔89: same two `E0425` missing-`acpu` symbols — and critically, this is the *corrected* story, not the obsolete \"cache unavailable\" claim the plan explicitly ordered preserving. Clippy 57↔80: same `needless_borrow` source diagnostic, but `same_error_headings: false` because Cargo's wrapper line differs (`bin \"nox\"` vs `bin \"nox\" test`). §3 and §27 both say so rather than smoothing it, and §49 shows the raw candidate tail. I checked whether that wrapper difference could hide a real new lint: the candidate's is the strictly broader target set (`--all-targets` compiling the bin's test harness too), the source diagnostic is byte-identical at `cli/main.rs:247:52`, and `normalized_stdout_equal: true`. Not a regression.\n\n**API comparison is isolated and its limits are stated.** §42's receipt shows record 101 consuming `/tmp/nox-no-std-api-candidate-target/doc/nox.json` against a separately-recorded baseline; §32 gives both files' byte counts and distinct sha256 and distinct compiler targets (`…api-candidate-target` vs `…api-parent-baseline-target`). §43 is the actual tail: `229 checks: 229 pass, 31 skip`, `no semver update required`. The brief, §3 and §9 all refuse to extend this to dependency-feature inheritance, which is correct: cargo-semver-checks models the default surface and would not see `Hash::to_hex` vanishing from a *downstream's* view. The shared-target diagnostics 60/61 are named and refused.\n\n**Unreachability of the two lost APIs is source-proven.** §13 shows `to_hex` gated, with `Display`/`Debug` unconditional and emitting the same hex. §14 shows `impl std::io::Read for OutputReader` gated with `OutputReader::fill` unconditional — the gated impl is a two-line delegation to `fill`. §17 is the decisive witness for nox: `data/hash.rs` uses only `hemera::tree::hash_leaf`, `hash_node`, `Hash::from_bytes`, `Hash::as_bytes`. §18's benchmark uses `hash_leaf`/`hash_node`/`as_bytes`. §8's `lib.rs` re-exports no Hemera type. No `to_hex`, no `Read`.\n\n**Arithmetic/backend independence from `std` is verified against complete files, not a scan summary.** I read §15 (`arith.rs`, 12016 B) and §16 (`backend.rs`, 6726 B) end to end: zero occurrences of `feature = \"std\"`; every cfg is `all(target_arch = \"aarch64\", not(hemera_portable))` or its negation. `Fast`/`Ct` selection in §16 is static trait dispatch with no feature or runtime CPU detection. §10's 18-site inventory is consistent with both. So the no_std switch cannot change the hash kernel — which is why the benchmark results below are anomalous rather than explanatory.\n\n**Ring/label is right.** §20 is the canonical text: a ring-0 PR merges without the owner only when every gate is green, blast radius is the repository, and no spec changed. Gates are not all green (fmt, clippy, docs, honeycrisp, exact-tag, benchmark), and §19 shows reverse Cargo edges into soft3/zheng/mudra/bbg/trident. `decision` + owner acceptance is the correct disposition, and §3 claims no new authorization. §21 opens the exact-tag red as its own task with a `blocks` edge and explicitly declines to modify any historical tag or lock — the right handling of record 64's `cannot update the lock file … --locked was passed`.\n\n## Closest call: the benchmark gate\n\nI considered blocking on this. §20's self-verification clause requires \"benchmark — no regressions vs baselines,\" and §28/§29 show measured slower cases. I am not blocking, for these reasons, and I want the reasoning on record because it is the one place a future reader could mistake this APPROVE for a performance clearance.\n\nThe data does not describe a code change; it describes an uncontrolled host. §47 (parent repeat) reports `pattern/add -19%`, `mul -18%`, `hash -27%`, `hash_chain_64 -47%`, `encode/tree_64 -54%`, `encode/particle_atom -53%` *against the parent's own earlier run of identical source*. The parent moved by up to 54% with zero bytes changed. That is the noise floor of this host, and it is larger than every candidate-vs-parent delta in §29 except `encode_tree_64` (+89.6%). §28 and §29 also disagree in *direction* on `add` (+23.7% then −36.4%), `mul` (+12.0% then −10.1%), `jet_merkle_verify` (+16.9% then −2.0%), `encode_particle_atom` (−4.8% then +43.1%) — sign-flipping is the signature of environmental variance, not of a feature flag. §29's own 95% intervals are internally unstable: parent `pattern/inv` spans 64.9–75.2 µs in §29 but §47's raw Criterion prints `[72.314 µs 106.20 µs 162.79 µs]` for the same run, a >2× spread.\n\nCrucially, the execution note does **not** make the argument I just made. §3 says \"cause is unestablished,\" \"not explained away as noise,\" \"the shared host was not a controlled benchmark lab,\" \"no further repeat or source tuning is hidden,\" and §30 says equal 3028144-byte sizes with unequal whole-file hashes \"does not localize a performance cause.\" §29's disposition field says \"remains red/unverified.\" That restraint is exactly what the plan's step 5 demanded and what makes the record trustworthy. Approving a *disclosed red* is a different act from approving a waived one, and the owner — not I — holds the disposition. I am approving the source repair with the gate red and stated; I am not certifying performance.\n\n## Blockers\n\nNone.\n\n## Required PR-body content (not blockers, but must not be dropped)\n\n1. **Verbatim:** \"Kadek still resolves unchanged registry nox 0.2.0.\"\n2. **The two affected dependency APIs by name:** `Hash::to_hex` and `impl std::io::Read for OutputReader` disappear for any downstream relying on nox's default edge to enable `hemera/std`. §19 shows no current consumer does; the sentence belongs in the durable record anyway.\n3. **The benchmark gate is RED/UNVERIFIED with cause unestablished** — nine-case pair with five breaches, one paired repeat with six, shared non-lab host. No speedup, equivalence or noise claim.\n4. **The exact-tag locked API baseline (record 64) is unmet**, with §21's follow-up linked by a `blocks` edge.\n5. **Inherited reds carried unchanged:** fmt, CLI `needless_borrow`, strict docs, honeycrisp missing-`acpu`, Trident clap prerequisite.\n6. **Future release floor** includes the component graph and the inherited dependency-feature contract, beyond cargo-semver-checks' default-surface result.\n\n## Advice (non-blocking)\n\n1. **Capture the parent's self-variance as a first-class artifact.** §47's parent-vs-parent deltas are the single most informative number in the benchmark material and currently exist only inside a raw stdout body. A `parent-self-variance.json` beside §28/§29 would let the next reviewer bound the noise floor without reconstructing it, and would support a *future* controlled measurement rather than retroactively excusing this one.\n2. **Pin Criterion's `--save-baseline`/`--baseline` instead of relying on its implicit `change:` lines.** §47 and §48 both print `change:` against whatever happened to be in each target's Criterion state, which is why §47 shows the parent \"improving\" against itself. Explicit named baselines would make the comparison semantics unambiguous.\n3. **Add the `rustup target add thumbv7em-none-eabi` line as a non-executing note** in the §7 CLAUDE section. §3 deliberately omitted it to keep the delta exact, which I accept; but a contributor hitting the red prerequisite will read it as a broken repository. Fold it in at the next CLAUDE edit.\n4. **Record the two std-only APIs in Hemera's own docs/CHANGELOG**, not only in nox's PR. The feature contract that just became load-bearing lives in Hemera; nox's PR body will be hard to find from there.\n5. **At the publication unit, re-run the inverse feature tree against the *registry* Hemera**, not the sibling path. §41 shows the package epoch builds, but §31's normalized manifest carries `default-features = false` on a version requirement — the forwarding behavior there deserves its own receipt before a bump.\n6. **Consider a CI matrix entry for `--no-default-features` on the host too.** §26 record 73 passes and is cheap; the named gate is thumb-only, and a host no-default build would catch `alloc`-vs-`std` slips without requiring the cross target.\n\nThe repair is two values, the diagnosis is raw compiler output in two dependency epochs, the feature invariant is shown as a two-stdout diff, 48 Rust files and all locks are byte-identical, the behavioral pairs are complete with distinct compiler roots, the inherited reds are preserved rather than laundered, and the one gate that is genuinely unexplained is labeled unexplained. 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