Rak v0.7.0

Upgraded compiler, new key features, IDE + installer fixes.

What's new in 0.7.0

Structured errors — catch e binds a first-class Error value with a kind, source span (file:line:col), cause, context map, and backtrace. New builtins: error, err_message, err_kind, err_line, err_col, err_file, err_cause, err_context, err_with_context (interpreter + VM).
True async concurrency — await_all, select (race), timeout, task_group, async_sleep, async_yield, and deferred async fn bodies running on a bounded worker pool (thousands of lightweight ops). Added the shared Tokio runtime (async_rt.rs) with a non-Tokio counting semaphore.
Streaming — pull-based Value::Stream with stream_from_array, stream_map, filter, take, stream_next, collect, read_lines, and tcp_stream; lazily consumed by for.
CLI — optional fn main(argv) -> int entry with real process exit codes, plus argv(), stdin_read_line, stdin_read_all, eprint, and the parse_args(spec, argv) flag parser.
Data processing — lazy stream_csv (RFC-4180) / stream_jsonl parsers and parse_csv_line, plus gzip/gunzip/deflate/inflate and zip_archive/zip_list/zip_extract (new stdlib/src/stream_io.rs).
VM line mapping — the compiler emits a source line-marker per top-level statement into Chunk.lines for source-to-bytecode mapping.

New bytecode-VM source debugger: break, continue/c, step/s, next/n, finish, locals, stack/backtrace, frame, print <name>, and full disassemble with line markers + operands.

Now a lib + bin so parse_manifest_str is reusable/fuzzable.
Version/rev constraints (user/repo@^1.2, #rev), rakpkg.lock (resolved rev + manifest SHA-256 checksum), and new commands: update, lock, tree (cycle-safe dependency graph), audit, publish.

8 proptest harnesses (stable CI) for the lexer, parser, DNS, packet builders, WebSocket, TLS, JSON, and tunnel framing (rakc/tests/proptest_harness.rs).
A standalone libFuzzer / cargo-fuzz pack (fuzz/, 13 targets: lexer, parser, eval, manifest, dns, tls, json, websocket, tunnel, netraw, csv, gzip, zip).

Fixed bugs in the IDE.
Added the full v0.7.0 syntax vocabulary to the IDE editor (CodeEditor) and the VS Code extension (vscode-rak grammar, version 0.5.1 → 0.7.0): structured errors, async orchestration, streaming, CLI, and compression builtins, plus 9 new editor snippets (fn main, await_all, task_group, timeout, stream, read_lines, stream_csv, parse_args, structured errors).

Restructured the docs: content is now split into markdown page files under docs/content/*.md (based on README.md and rak-features-spec.md), and docs.html is now a lightweight markdown-driven viewer (dependency-free renderer + hash router) served by GitHub Pages.

Fix PATH clobbering on Windows — the installer no longer overwrites a user's entire PATH. Previously a broken reg query parse could capture the registry type token and setx /M could write the system PATH even for user installs, breaking unrelated CLIs (e.g. rustc/cargo). Now PATH edits are append-only on the correct registry hive (HKCU for user, HKLM for system), setx is removed, and a WM_SETTINGCHANGE broadcast refreshes running programs.
Uninstall now removes only the rak PATH entry (instead of deleting the whole PATH value) and only recurses into rak-owned directories.
Component selection is now an explicit multi-select on the first screen (space to toggle, enter to confirm), with rakc + rakpkg preselected.
--install validates component names and rejects unknown ones.