feat(symbian): run PocketJS apps on Nokia E7

[doodlewind]

Summary

• add a pinned linux/amd64 Qt 4.7.4, Belle SDK, GCCE 4.6.3, GnuPoc, Rust, and QuickJS toolchain for Nokia E7 development
• implement the no-std PocketJS Rust core ABI and a Qt/QuickJS Symbian host with embedded application JavaScript and PAK assets
• expose the workflow through pocket symbian ..., including exact E7 MTP staging with readback verification, direct USB CODA health checks, and repeatable coda usb launch
• run PocketJS at the E7 native viewport: 640x360 landscape and 360x640 portrait, with Qt automatic orientation and in-place Solid/Vue Vapor relayout that preserves application state
• retain the Hero fixed 480x272 PSP/Vita contract while adding a dynamic E7 variant and portrait-safe responsive rows

Review follow-up

• guard the Symbian global allocator against alignments above the platform malloc guarantee in both alloc and realloc
• derive core ticks as 60 / POCKETJS_FRAME_RATE and reject non-positive or non-divisor rates at compile time
• allocate experimental host ABI 4 and pass the resolved plan value through build-app → qmake → C++ instead of duplicating it
• move the shared live-viewport hook lifecycle into host.ts; Solid and Vue Vapor tests now retain a real content node and component state across resize without remounting
• remove dead viewport keys, keep docs/SYMBIAN_E7.md git-only, document the container Bash exception, update repository structure, and add the standalone Symbian bridge test to the release workflow
• keep Hero admission target-neutral, including macOS widget, and keep the experimental profile tool-owned until its production graduation gates are met
• make doctor require the locally installed pinned nightly, its Cargo component, and exact rust-src state without implicitly downloading a missing toolchain; app builds invoke that selected nightly explicitly
• acquire the runtime output lock before resetting or writing the shared payload, and hold it through guest build, Rust core build, container packaging, and final output validation
• replace live Bullseye repositories with exact Debian and Debian Security snapshot imports; package resolution is now part of the implementation digest, extra sources are removed, and bounded APT retries cover transient snapshot CDN failures

Follow-up design work is tracked in #178, #179, #180, #181, and #182.

Physical-device validation

• pocket symbian doctor --device --coda-usb passes against an RM-626 Nokia E7 in Nokia Suite mode
• CODA reports 4.0.23:app; the TCF Locator handshake completes over USB without an IP address or legacy Nokia macOS driver
• pocket symbian coda usb launch remotely starts the installed PocketJsE7Runtime.exe; the final public CLI validation returned CODA process context p2399
• the Qt UI probe is visible on the E7
• the Rust probe displays PocketJS Rust core linked on Symbian
• the QuickJS probe displays QuickJS + Promise jobs: 42
• adaptive runtime 1.1.1 was staged to Mass memory/Installs and read back byte-for-byte; SHA-256: 49e40c39d9bc0aaab93ad0d62f4722f956180aa40c1dfa87d6dae3379bfd35b8
• runtime 1.1.1 installation, launch, visible output, and native 640x360 landscape / 360x640 portrait live relayout are confirmed on the RM-626
• final review build 1.1.2 with host ABI 4 packages successfully from the fixed-snapshot toolchain; SHA-256: e23903d0dbeb8535dac4f1644cb3cdf0fd6587c1984f3e95b338cd889a8662a8

Validation

• bun run test — 221 + 170 + 1 + 7 + 4 + 10 + 13 tests pass
• bun tests/golden.ts — 49/49 web pixel goldens pass without updates
• bun run tape:check — 180/180 deterministic frame hashes match
• the CODA protocol fixture checks the exact 59-byte launch payload, fragmented/coalesced frames, progress then reply, NAK, command errors, reply overflow, and invalid process IDs
• the shipped C client compiles with C11 -Wall -Wextra -Werror
• bunx tsc --noEmit
• cargo fmt --manifest-path engine/symbian/Cargo.toml -- --check
• cargo clippy --manifest-path engine/symbian/Cargo.toml --all-targets -- -D warnings
• cargo test --locked --manifest-path engine/symbian/Cargo.toml — 2/2 pass
• custom armv6-symbian-eabi no-std release build
• no-cache Docker image rebuild installs amd64+i386 packages exclusively from the exact Debian snapshots; package-set SHA-256: fe3bf96a06fa3051d08e8c7d9e1d5084a9447b80c2a71f18c15a107dd7add95c
• rebuilt bun tools/symbian.ts setup --yes with native qmake, Qt code-generator, GCCE/E32, SIS, and signing smoke checks
• final bun tools/symbian.ts doctor passes Docker, pinned Rust/Cargo/rust-src, download hashes, native tools, and host MTP prerequisites
• final application build passes GCCE 4.6.3/C++98 compilation, Rust/QuickJS/Qt linking, elf2e32, SIS packaging, signing, and host ABI 4 propagation
• simulator visual QA at 640x360 and 360x640 confirms a full opaque canvas, portrait wrapping, and no clipping or overlap
• shell syntax and git diff --check

Boundary

The private symbian-e7-dev profile remains outside the production target registry until repeatable physical-device acceptance and golden testing are complete. The current public input wire has 9-bit touch coordinates, so the E7 host does not advertise touch and suppresses native-size touch snapshots rather than truncating the 640-pixel axis.

The new CODA command is remote launch, not a full source-level debugger. CODA exposes run control, logging, memory, registers, and breakpoints, but PocketJS does not yet ship a CODA-to-GDB adapter, matching native symbol artifacts, or a Symbian GDB. QuickJS source-level breakpoints remain a separate PocketJS DevTools transport task.