release: v0.30.0 — debugging-and-distribution + the first-consumer wave

[InauguralPhysicist]

Cut v0.30.0 (v0.29.0 was 2026-07-10; twelve substantive merges since).

Theme: debugging-and-distribution tooling plus the first-consumer findings wave from the DeslanStudio port.

• Time-travel debugging: --step tape stepper with observer-trajectory labels per step (eigsdap v1: a CLI tape-stepper (step forward/back, bindings + trajectories); DAP/VS Code only after locals ride the tape #418), tape format v2 scope-qualified locals (eigsdap v2/v3: scope-qualified locals on the tape, then a DAP server (stepBack/reverseContinue in VS Code) #539), runtime-error carets + token-precise LSP ranges (Runtime-error carets + token-precise LSP ranges (residual of #407) #407 residual)
• Distribution: --bundle single-file executables, optionally with an attached tape = an executable bug report (--bundle: single-file distribution (script + eigs_modules appended to the runtime binary; optional attached tape) #413)
• Observer: raw-step diverging/oscillating value-channel signals (Observer value channel (report_value) is blind to sub-exponential divergence and sub-deadband oscillation (relative-delta normalization) #422) + trajectory of / classify of snapshots across call boundaries (Trajectory contracts across a call boundary: the observer slot is binding-identity, so a value's history can't be inspected by a function it's passed to #421)
• First-consumer wave (DeslanStudio): entropy walk cycle/DAG detection (compute_entropy walks cyclic object graphs without cycle detection — two back-references make every observed assignment take ~2^32 work #571), O(1) borrow scan (Builtin call with a single list argument is O(len(list)) — the direct-borrow heuristic scans the user's list, making len of xs loops quadratic #546) + sanitizer borrow-scan guard (Debug-build guard for the #546 borrow-scan cap: full-scan past the cap and abort on a missed borrow #548), keyword dot keys (Dot access rejects keyword-named fields (d.loop, d.in, d.when) — keys reachable by literal, bracket, and json_decode are unreachable by . #542), lib/ui input-event trio (lib/ui: canvas on_mouse never receives mousemove — no drag interactions possible on a custom-painted widget #567–lib/ui: wheel events cannot reach a canvas — no on_wheel seam, registry scroll is scroll_panel-shaped #569), gfx audio capture (gfx audio: no audio INPUT/capture builtin (SDL recording unexposed) #579) + buffer playback (gfx audio: audio_play / audio_play_loop reject VAL_BUFFER samples (list-only) #578), read_line (No stream-safe stdin read: read_text of "/dev/stdin" is empty on a pipe, and there is no read_line builtin #558), is_dir (no is_dir/stat builtin — directory detection needs the file_exists of "path/." probe #576), RFC 8259 json exponents (json_decode rejects exponent notation in numbers (1e-06) — RFC 8259 violation #557), W013/W019/LSP/load_file tooling batch (lint: W013 (builtin shadowed) is reported against the NEXT statement, defeating same-line # lint: allow W013 #556/lint: no warning when a question-word "assignment" (why is x) silently parses as a discarded interrogative #583/LSP completion advertises an input builtin that does not exist #559/load_file prints an unconditional "[load_file] Loading ..." banner to stderr — consumer apps cannot ship quiet #560)
• Fork PRs now get Linux CI via the rolling ci-main image (ci: give fork PRs Linux CI — run them in the rolling ci-main image #554)
• Stdlib discoverability: 808-function coverage + the task-oriented "Finding Things" index in docs/STDLIB.md

Mechanics: VERSION, CHANGELOG [0.30.0] section, CLAUDE.md latest-release line, and docs/llms.txt stamp move together. doc_drift rule 2 (release line vs latest tag) resolves when the Release dispatch creates the v0.30.0 tag, per the Releasing section.

After merge: dispatch the Release workflow, then the consumer pin sweep.

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