SN Pedestal Source Recovery — landed record

The 22 manual pedestal names are resolved. The original "sources pending in the GENERATE_NAME queue, drain to recover" premise was disproven on inspection; the real fault was a compose-grounding gap plus stale grammar segments. All code landed on imas-codex main (2026-07-09); the graph mutation ran on the live facility graph. The plan lives in ISN; the code is in imas-codex.

Root cause (confirmed)

The ISN grammar is correct: pedestal_top is a first-class atomic locus that round-trips compose(parse(name)) == name byte-for-byte.
Compose grounding gap: a per-species DD value leaf (…/velocity_phi/<species>/value) carries only a terse template stub ("Deuterium (D)."); the rich LLM-enriched description that names the evaluation locus — "Ion toroidal rotation velocity … at the pedestal top" — lives on the parent quantity node, which compose never saw. So compose took the bare DD path segment pedestal as the locus → minted …_at_pedestal near-duplicates.
Stale structured segments: 49 catalog names had id …_at_pedestal_top but a stored position='pedestal' written by the since-removed bulk import and never re-derived through the grammar.

Result on the live graph (production)

16 pedestal names recovered — 15 toroidal_<species>_velocity_at_pedestal_top + toroidal_plasma_momentum_at_pedestal_top now own real StandardNameSource(dd) (velocity_phi + velocity_tor per species where the leaf exists; momentum_phi + momentum_tor), matching the carbon fresh-parity exemplar (source_id=null, FROM_DD_PATH linked). The 16 redundant manual sources were dropped.
Content untouched — all 16 remain accepted/accepted; name/description/documentation byte-identical to the pre-run snapshot (0/16 changed).
Ledger invariant preserved — orphans 0, edge/scalar desyncs 0 throughout.
Grammar segments realigned: reconcile_grammar_segments corrected 176 names catalog-wide (position/component/… now match the canonical id); idempotent thereafter.
6 names remain manual (genuinely anchorless — no clean pedestal-top DD leaf): surfaced as open naming questions (see below), never fabricated.

Workstreams (all on imas-codex `main`)

WS	What landed	Commit
WS-1 compose grounding	Walk `HAS_PARENT` and surface the nearest description-bearing ancestors into both `generate_name` and `generate_docs` context. Durability proven: `sn run --focus …/velocity_phi/deuterium/value` now composes `toroidal_deuterium_velocity_at_pedestal_top` with `position=pedestal_top`. +graph-marked test.	`a34b7fc`
WS-2 segment self-heal	`reconcile_grammar_segments`: idempotent per-rotation sweep re-deriving every live name's segment columns from its canonical id via the ISN parser; wired into the loop reconcile. Rejected names untouched. +test.	`(WS-2)`
WS-3 recovery	Deterministic targeted-attach of the real dd sources to the 16 existing accepted names (graph mutation); redundant manual sources dropped. No LLM, no recompose, content preserved.	graph
WS-4 exclude-pending	Rebuild cascade skips an orphan with a claimable pending (extracted/drafted) dd source rather than synthesizing a derived/manual fallback; desync reattach refined to genuine (composed/attached) sources only. +regression test.	`(WS-4)`

The 6 anchorless `manual` names — RESOLVED (2026-07-09)

Reviewed per-name with the lead; live manual-bound names 22 → 1. Never a fabricated DD path.

Anchored poloidal_magnetic_flux_at_pedestal_top [Wb] → summary/local/pedestal/position/psi [Wb].
Anchored toroidal_diamagnetic_magnetic_flux_at_inside_flux_surface [Wb] → equilibrium/time_slice/constraints/diamagnetic_flux [Wb].
Anchored length_of_iron_core_segment [m] → iron_core/segment/geometry/oblique/length_beta [m] — found via imas-dd search (in the iron_core IDS, not the equilibrium constraint subtree).
Superseded flux_due_to_thermal_fusion [Hz] → existing proper total_neutron_source_rate_due_to_thermal_fusion (redundant duplicate; "flux" mis-named a Hz rate).
Superseded lower_energy [eV] → existing proper lower_bound_energy_of_neutron_detector (redundant generic duplicate).
Kept manual normalized_poloidal_magnetic_flux_at_pedestal_top [1] — genuinely anchorless (no psi_norm leaf; only rho_tor_norm, the wrong coordinate).

Also: electron_flux_surface_average_beta_at_pedestal_top and poloidal_flux_surface_average_magnetic_field_at_pedestal_top fail the ISN parser (a flux_surface_average grammar edge case) and were left untouched by WS-2 — a separate grammar item.

Follow-ons

Blast-radius assessment — the compose-grounding gap affected more than the pedestal names (176 segment realignments hint at breadth). Assess which already-composed names were built on template-stub grounding and decide whether to --reset-to recompose under the WS-1 fix. Assessment first; remediation separately.
DD value-leaf enrichment — per-species value leaves get template descriptions, not LLM enrichment; a broader DD-enrichment quality item (out of scope here).
Naming-consistency families — the separatrix_average multiplicity (f-psr-005) and the fusion neutron flux→rate family (f-psr-006) share the same class: a canonical-form decision + dedup/rename cascade. Deferred (broader than this plan).