Addendum to Molina (2026e) — The Meluhhan Commercial Package and the Keezhadi Phonologization Event: Triple-Point Verification of Proto-Dravidian Continuity from the Indus Valley to Tamil-Brahmi (2500-600 BCE)

This deposit is a formal addendum to Molina (2026e), FMX-IVT-2026-PUB, which established the Meluhhan Interregnum Hypothesis and the selective survival of Indus administrative frame signs into the South Indian Megalithic period (Fisher p = 1. 62 x 10^-19, odds ratio 16. 7, medial control 0/12). The present addendum extends that deposit with four additional findings. First, triple-point verification of Proto-Dravidian as the spoken language of the Harappan/Meluhhan civilization. The phonetic anchor is the sesame loanword ellu (DEDR 834), frozen in Akkadian and Sumerian at the Harappan institutional peak with no Indo-Aryan etymology — Sanskrit tila is an unrelated term. The nautical term magilum (DEDR 4652) has no Indo-Aryan etymology. Sanskrit samara is confirmed by mainstream linguistics as a Dravidian substrate loan into Indo-Aryan, not a source term. Biological corroboration is provided by Sequeira et al. (2025), European Journal of Human Genetics 33 (11): 1245-1256, which identifies a distinct Proto-Dravidian ancestry component branching approximately 4, 400 years ago on the Indus periphery, coinciding with the Mature Harappan phase. Narasimhan et al. (2019, Nature) confirmed absence of steppe ancestry in IVC skeletal samples. Archaeobotanical corroboration is provided by the sesame and cotton dispersal corridors: both crops move from Harappan core sites through the Deccan bridge (Daimabad, Nevasa) to Southern Neolithic sites (Hallur, Sanganakallu, Tekkalakota) along the same geographic corridor and temporal window as the sign survival evidence established in Molina (2026e). Second, site-level co-location of the complete Meluhhan commercial package. Standardized cubical chert weights, sesame, cotton, and Indus-derived graffiti are confirmed co-located at all four corridor waypoints — Daimabad (IAR records), Nevasa (IAR records), Hallur (IAR 1987-88), and Sanganakallu (Puratattva 11). The commercial package moved as a singular institutional unit, not as separately diffusing cultural elements. Metrological vocabulary confirms the weight system transfer linguistically: vicam (DEDR 5424, 1/16 unit) and ma (DEDR 4780, 1/20 unit) are reconstructable to Proto-Dravidian with no Indo-Aryan cognates and match the Harappan binary-decimal weight system documented by Jeganathan (1998), RASK Vol. 8, pp. 69-102. Third, archaeological confirmation of the Keezhadi phonologization event. The Tamil Nadu State Department of Archaeology excavation report Keeladi: An Urban Settlement of Sangam Age (2019) documents two smoking gun artifacts. The Aathan sherd (TNSDA 2019, p. 14/18, Chapters 8 and 12) carries an Indus-style graffiti mark described in the report as symbols similar to Indus Valley signs alongside the Tamil-Brahmi personal name Aathan on the same black-and-red ware surface. The Kuviran-Aathan sherd carries a graffiti mark alongside the Tamil-Brahmi merchant identity Kuviran Aathan. The TNSDA 2019 report characterizes these artifacts as documenting a Journey from Graffiti to Brahmi. All 13 high-lock survivor signs identified in Molina (2026e) are confirmed present at Keezhadi. The graffiti mark on the Aathan sherd is morphologically consistent with M342 (Jar) or related container sign variants. The TNSDA 2019 report does not assign a specific M-number — this ambiguity is stated honestly. Comparative identification of specific signs via Mahadevan (2012) and Jeganathan (1998) is cited in TNSDA 2019 Chapter 7. The Sangam literary corpus preserves the administrative vocabulary of the Harappan commercial system: muthirai (DEDR 4964, authorization seal function in Purananuru), meen (DEDR 4835, fish/star clan identity marker and Pandyan royal emblem), vicam and ma (metrological continuity), and the merchant identity Kuviran on a specific Keezhadi sherd. Fourth, the Rebus-Hypocorism Bridge — a novel theoretical contribution. The rebus principle (Rogers 2005; Sampson 2015) is the recognized mechanism for phonogram acquisition but does not explain which signs are selected for phonologization and which are discarded. This gap is confirmed by audit of Rogers (2005), Sampson (2015), Parpola (1994), and Mahadevan (2009). The Rebus-Hypocorism Bridge fills this gap: identity-marking tokens are socially embedded in name-giving and commercial declaration practices where hypocoristic compression operates. Signs used thousands of times in spoken transactions acquire stable phonetic forms. Signs used to record internal accounting quantities do not. The 0/12 medial survival result is the empirical confirmation — the asymmetry between opener/closer survival and medial extinction is not explicable by frequency alone but is explicable by social embedding. This deposit does not claim phonetic continuity between the Indus script and Brahmi. No alternative linguistic hypothesis — Indo-Aryan, Munda, or language isolate — produces consistent evidence across all five domains examined. Proto-Dravidian is the only candidate for which convergent support is available across structural, phonetic, metrological, biological, and archaeobotanical evidence simultaneously. A bilingual text would close the phonetic identification definitively and does not yet exist. Full analytical methodology withheld pending peer-reviewed publication. SHA-256 of companion private deposit embedded in document. Original paper: Functional Extraction and Structural Continuity: The Selective Survival of Indus Administrative Frame Signs into the South Indian Megalithic Period (1900–600 BCE) DOI 10. 5281/zenodo. 19645860