PUH Theorem 276 (Survey Note) — The Coherence Thread: Six Filed Fragments of Synchronization Physics in the Corpus, Collected at Filed Strength (Phase Locking, Pulsed Throughput, the PPC Coherent Clock, Resonance, Alignment, Dephasing); Two Obstacles Named; Two Markers Defined; No New Claims

SURVEY NOTE (T276) — the most conservative deliverable type in the archive: ZERO new claims. Collects six already-filed fragments of synchronization physics at exactly their filed strength; names the two obstacles any development must clear first; defines two MARKERS explicitly below conjecture grade. Origin: an independent critique of T275 (author's parallel-review workflow) observed a latent coherence thread; verification against the archive overturned the reviewing collaborator's initial skepticism. Tags: ESTABLISHED / ESTABLISHED-PUH / CONJECTURE (as filed) / MARKER / NOT CLAIMED. === DESCRIPTION (abstract) === Photonic Universe Hypothesis (PUH) — Survey Note. THE DISTINCTION: T275 frames substrate dynamics as ANNEALING (stochastic shaking + settling on an energy landscape). Synchronization — phase alignment under coupling or periodic forcing — is a physically distinct, equally universal process (Kuramoto 1975/1984; Pikovsky-Rosenblum-Kurths 2001; Acebrón et al. 2005). The question answered here, narrowly: does the PUH corpus already contain synchronization physics? Verified fragment by fragment: yes — six times, in six places, never connected. THE SIX FRAGMENTS (each quoted at filed strength; this note ADDS NONE): F1 — Condensate phase locking (T199): "Quantum entanglement between two particles is the phase-locking of their E8 bow waves through the shared Phase I condensate." F2 — Pulsed gated throughput (T244, CONJECTURE, guardrails intact): the cascade as "a periodic, pulsed flow at the rotational gating frequency" — the corpus's only candidate INTERNAL periodic driver. F3 — The PPC coherent clock (T161 + connecting paper): all cores inside a uniform-density body share one orbital period — "The PPCs act as a coherent clock" — WITH four stated discriminants against the conventional null and a designated live dataset (Juno JEDI, 177.86 min, 30-year baseline). F4 — Blackbody as resonance profile (T176): h as "the smallest coherent oscillation the Casimir constraint geometry permits." F5 — The alignment transition (T164): Sp(8) magnetisation as "the phase transition between ordered and disordered packing regimes." F6 — Lattice-drag dephasing (Brookhaven leads paper): coherence LOSS — depolarisation as lattice drag de-phasing spin alignment; plus THz probes of lattice oscillation modes. The thread has both a locking channel and a dephasing channel. OBSTACLE ONE — DISCRIMINABILITY: tidally phase-locked seismicity (deep moonquakes) is ALREADY explained by tidal stress triggering; the archive's own record is explicit that lunar observations do NOT evidence a Planck core. A substrate-synchronization claim predicts nothing without DISCRIMINANTS the conventional null cannot produce. T161 is the corpus's own template (four discriminants + live dataset); until an equivalent derivation exists, the thread licenses NO observational claim. OBSTACLE TWO — THE ROBUSTNESS OVERLAP: before "selection for robustness" can be conjectured, the theorem layer must be subtracted: universal optimality IS robustness-to-potential; extremality/eutaxy ARE perturbative stability; basin dominance IS T275's conjecture. The residual kernel — selection under SUSTAINED DRIVEN perturbation (nonequilibrium) — is real but not yet a conjecture, because no robustness measure is defined (basin volume, escape time, driven response are inequivalent candidates). Definition first; conjecture after. TWO MARKERS (explicitly NOT conjectures): M1 — Synchronization-assisted convergence: IF T244 holds, the T275 landscape is periodically driven; determine whether pulsed gating enlarges/stabilises the E8 basin (prerequisites: T244's E8 symmetry analysis; the equation of state). M2 — Driven-robustness selection: define the measure; verify non-reducibility to the Section-4 theorems; then and only then conjecture. NOT CLAIMED: any new mechanism or prediction; any strengthening of any fragment; that synchronization signatures exist in any dataset (lunar seismicity explicitly included); that the markers are conjectures; any change to the status of T274 or T275.