Sync fpgs-dev with develop (#6599)

# Description

Merge current `develop` (`564a0083a00`) into `fpgs-dev` while retaining
the FeatherPGS solver integration and tuned task presets.

`develop` introduced the `SolverBase.reset` API and a side-effect-free
solver factory contract after the previous public FeatherPGS Newton pin.
This sync therefore also:

- pins the public, reset-compatible
`ooctipus/newton@186502cec5db4b80a4cc235c9a6f5e4266ee2c07` revision;
- aligns `NewtonFeatherPGSManager` with the current `_create_solver`
contract;
- keeps the FeatherPGS Go1 and G1 presets while accepting the updated
Kamino defaults;
- preserves the centralized dependency ownership introduced on
`develop`.

## Type of change

- Bug fix (non-breaking change which fixes the stale branch and
dependency incompatibility)

## Tests

- `uv run -m newton.tests -k feather_pgs`: 25 passed.
- `./isaaclab.sh -p -m pytest
source/isaaclab/test/cli/test_uv_run_pyproject.py -q`: 6 passed.
- IsaacLab formatting/lint hooks passed. The all-files merge-marker hook
was skipped only for three license files added unchanged by `develop`
whose license headings contain `=======`. The LFS pointer hook was
skipped because this parent checkout has a local `.git/info/attributes`
override disabling golden-image LFS; repository `.gitattributes` remains
unchanged and correct.
- Focused IsaacLab runtime test collection is unavailable in this
isolated worktree because its wrapper selects system Python without
NumPy/IsaacLab packages. The public Newton solver tests above ran with
Warp 1.15 on RTX 5090 GPUs.

## Screenshots

Not applicable.

## Checklist

- [x] I have read and understood the contribution guidelines.
- [x] I have run the applicable pre-commit checks with `./isaaclab.sh
--format`.
- [x] Documentation changes are not required for this branch sync.
- [x] My changes generate no new warnings.
- [x] I have added or updated tests for the merged manager contract and
dependency pin.
- [x] The existing FeatherPGS changelog fragment remains in place.
- [x] My name already exists in `CONTRIBUTORS.md`.

---------

Signed-off-by: Antoine RICHARD <antoiner@nvidia.com>
Signed-off-by: Matthew Taylor <mataylor@nvidia.com>
Signed-off-by: Advait Jayant <advait@vannalabs.ai>
Signed-off-by: Asier Arranz <asier@nvidia.com>
Signed-off-by: Lionel Gulich <lgulich@nvidia.com>
Signed-off-by: Mustafa H <34825877+StafaH@users.noreply.github.com>
Signed-off-by: Kelly Guo <kellyg@nvidia.com>
Co-authored-by: Agon Serifi <39410867+aserifi@users.noreply.github.com>
Co-authored-by: Antoine RICHARD <antoiner@nvidia.com>
Co-authored-by: hujc <leo.hu.sh@gmail.com>
Co-authored-by: Ruben Grandia <rubengrandia@gmail.com>
Co-authored-by: Agon Serifi <agon.serifi@disney.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: isaaclab-bot[bot] <282401363+isaaclab-bot[bot]@users.noreply.github.com>
Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>
Co-authored-by: Peter Verswyvelen <pverswyvelen@nvidia.com>
Co-authored-by: pv-nvidia <peter.verswyvelen@gmail.com>
Co-authored-by: Mike Yan Michelis <46975745+mmichelis@users.noreply.github.com>
Co-authored-by: Matthew Taylor <mataylor@nvidia.com>
Co-authored-by: hujc <jichuanh@nvidia.com>
Co-authored-by: Piotr Barejko <pbarejko@nvidia.com>
Co-authored-by: Mustafa H <34825877+StafaH@users.noreply.github.com>
Co-authored-by: Richard Lei <rilei@nvidia.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: nvsekkin <72572910+nvsekkin@users.noreply.github.com>
Co-authored-by: Lynn <lynnhe02@gmail.com>
Co-authored-by: Kelly Guo <kellyg@nvidia.com>
Co-authored-by: Ruben D'Sa <rdsa@nvidia.com>
Co-authored-by: Advait <advaitjk@gmail.com>
Co-authored-by: Advait Jayant <advait@vannalabs.ai>
Co-authored-by: matthewtrepte <mtrepte@nvidia.com>
Co-authored-by: Daniela Hase <116915287+daniela-hase@users.noreply.github.com>
Co-authored-by: r-schmitt <139814266+r-schmitt@users.noreply.github.com>
Co-authored-by: Zeng Qingcheng <60593302+NeoZng@users.noreply.github.com>
Co-authored-by: vidurv-nvidia <vidurv@nvidia.com>
Co-authored-by: myurasov-nv <168484206+myurasov-nv@users.noreply.github.com>
Co-authored-by: Mikhail Yuraaov <misha@mymbp4.local>
Co-authored-by: Asier Arranz <asierarranz@gmail.com>
Co-authored-by: Asier Arranz <asier@nvidia.com>
Co-authored-by: HuiDong Chen <huidongc@nvidia.com>
Co-authored-by: lgulich <22480644+lgulich@users.noreply.github.com>
Co-authored-by: Maximilian Krause <maximiliank@nvidia.com>
Co-authored-by: Mihail Yurasov <myurasov@nvidia.com>
Co-authored-by: Rebecca Zhang <168459200+rebeccazhang0707@users.noreply.github.com>
Co-authored-by: pv-nvidia <pv-nvidia@nvidia.com>

Author: 36 people

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