chore(release): 1.0.0-rc.3

[davydog187]

Cuts 1.0.0-rc.3. Bumps mix.exs @version to 1.0.0-rc.3 and promotes the Unreleased CHANGELOG section into a dated v1.0.0-rc.3 entry summarizing the diff vs rc.2.

The website footer/install snippet read the version from the app spec (since rc.2), so no manual website edits are needed.

What's in rc.3

Added

• Lua.Parser.parse_structured/1 + Lua.Parser.Error.to_map/1,2 — structured parse errors with the same wire shape as runtime errors, for tooling (feat(parser): expose structured parse errors (parse_structured + Error.to_map) #363)
• Lua.new/1 :max_instructions instruction budget (feat(vm): add configurable :max_instructions instruction budget #320)

Performance

• Honest register-tuple sizing on both engines (perf(vm): drop +16 register buffer on interpreter :call path #312, Deep recursion ~25% slower since rc.0 — cheapen per-call depth-limit bookkeeping #324)
• Recursive-call path closes the fibonacci gap with Luerl — register reclaim + lazy call frames (perf(vm): close the fibonacci gap with Luerl — register reclaim + lazy call frames #360)
• O(1) #t on no-hole tables (perf(table): cache array border for O(1) #t on no-hole tables #350)
• O(1)-per-step pairs over hash-keyed tables (perf(table): O(1)-per-step hash iteration via memoized order index #349)
• Bitwise + set_list tails compiled on the dispatcher (perf(vm): compile bitwise ops and set_list multi-return tails #347)

Fixed

• Conformant goto/label on both engines (feat(vm): conformant goto/label on both engines #364)
• Parse errors reported at the real offending token (fix(parser): report syntax errors at the real offending token #357, fix(parser): blame the opener for unclosed tables and empty bracket lists #365, fix(parser): propagate deep errors past function-call argument lists #366)
• Lua.call_function/3 terse error value for ArgumentError (fix(vm): return terse error value for ArgumentError at protected-call boundary #354)
• Correct source line in compiled-chunk errors (feat(vm): plumb per-call source lines through the compiled dispatcher #355)
• required modules visible in pairs(package.loaded) (fix(stdlib): route cache_module_result through Table.put so required modules appear in pairs(package.loaded) #356)
• tostring(fn) returns a function: 0x... address (chore: roadmap hygiene, settle 1.0.0 suite gate (20/29), tostring(fn) fix #353)

Verification

• mix format --check-formatted — clean
• mix compile --warnings-as-errors — clean
• mix test — 2523 passed, 7 skipped
• mix docs --warnings-as-errors — clean
• mix hex.build — builds lua-1.0.0-rc.3.tar

Release handoff (manual, after merge)

Not auto-tagged or published. After merge to main:

git tag v1.0.0-rc.3
git push origin v1.0.0-rc.3

Creating the GitHub Release triggers .github/workflows/release.yml, which runs mix hex.publish.