Add native speech synthesis and voice-imitation faculty

speech.el: formant/glottal integer DSP synthesis + voice-analyze-by-
imitation. voice-profile.el / voice-ingest.el: voice-profile plumbing.
accent.el: British-RP as an ingested transform-geometry (explicitly marked
provisional/citation-pending by its own comments). organ-read.el:
engram read-through for the speech organ. Includes demo/test drivers and
non-personal reference data (British-RP phonetics/lexicon derived data,
a public-domain LibriVox RP reference recording).

Deliberately excludes elp/data/live/ (raw recorded voice + face-photo
samples of the repo owner) and the will-*.{json,psv} derived voiceprint
files — personal biometric data that shouldn't be committed to a shared
repo without an explicit decision from the owner. Also excludes this
worktree's elp/src/surface-profile.el, which diverges from the copy in
other worktrees (agent-aaf04b0a9714c4070, main) — needs manual
reconciliation before landing, left out here to avoid silently picking a
version.

elp/data/british-accent.psv

@@ -0,0 +1,26 @@
+# british-rp-accent TRANSFORM — INGESTIBLE DATA (a geometry/transform composed
+# onto the base General-American phoneme targets; voice + accent, separable).
+#
+# PROVENANCE — HONEST, COARSE FIRST PASS. These are DERIVED targets, NOT
+# transcribed measured RP formants. Measured RP tables (Deterding 1997 JIPA 27;
+# Hawkins & Midgley 2005 JIPA 35) are the intended ground truth but were gated at
+# author time and NOT transcribed. Each target = the MEASURED Peterson&Barney
+# (1952) base vowel transformed under the documented, citable RP-vs-GA structural
+# rules of Wells (1982): non-rhoticity, TRAP F2-lowering, LOT/THOUGHT back-
+# rounding, GOOSE-fronting, GOAT centering, NURSE de-rhoticization. Shift
+# magnitudes are coarse/approximate; directions are cited. ground=derived.
+# Refine by transcribing the measured RP tables. No value is claimed as measured.
+# Format: KEY|F1|F2|F3|KIND|SET
+IY|280|2249|3000|vowel_override|FLEECE
+IH|360|2100|2550|vowel_override|KIT
+EH|560|1970|2480|vowel_override|DRESS
+AE|730|1590|2410|vowel_override|TRAP
+AA|560|920|2440|vowel_override|LOT
+AO|415|700|2410|vowel_override|THOUGHT
+UH|380|1100|2240|vowel_override|FOOT
+UW|310|1650|2240|vowel_override|GOOSE
+AH|680|1180|2390|vowel_override|STRUT
+ER|550|1500|2500|vowel_override|NURSE-nonrhotic
+AX|500|1500|2500|vowel_override|commA
+OW|450|1400|2380|vowel_override|GOAT
+R|0|0|0|rule|non_rhotic_drop_coda