Cherry-picks pyglet and visualizer fixes from develop

[kellyguo11]

Description

Cherry pick visualizer fixes from develop:

• Initialize visualizers before timeline play on reset #6176
• Declare pyglet for Newton GL features #6179

[greptile-apps]

Greptile Summary

This cherry-pick backports two fixes from develop to release/3.0.0-beta2: a SimulationContext.reset() ordering correction that ensures visualizers are initialised before play() pumps timeline events (preventing stale PhysX tensor views), and an explicit pyglet>=2.1.6,<3 dependency added to both isaaclab_newton and isaaclab_visualizers so the Newton GL viewer no longer relies on ambient transitive installs.

• simulation_context.py: initialize_visualizers() is now called between physics_manager.reset() and physics_manager.play() instead of after play(), with a matching new unit test asserting the exact event order.
• setup.py (both packages): pyglet>=2.1.6,<3 is added as an explicit dependency; the install-command print message and docs are updated to match.

Confidence Score: 5/5

Safe to merge — the reset ordering fix is narrowly scoped, well-tested, and the dependency additions are additive-only with a pinned lower-bound and a conservative upper bound that excludes the unreleased pyglet 3.x series.

Both changes are straightforward: a two-line reorder in reset() backed by a new event-log test that exercises the exact failure scenario, and two additive setup.py lines that make an already-required runtime package explicit. No logic is removed, no existing tests are modified, and the version constraint for pyglet is consistent across both packages.

No files require special attention. The only behavioural change is in simulation_context.py, and the new test covers the corrected ordering directly.

Important Files Changed

Filename	Overview
source/isaaclab/isaaclab/sim/simulation_context.py	Moves initialize_visualizers() before physics_manager.play() in reset(), ensuring visualizers can safely access PhysX tensor views before timeline events are pumped.
source/isaaclab/test/sim/test_simulation_context_visualizers.py	Adds test_reset_initializes_visualizers_before_playing_timeline to verify the new reset ordering via event-log assertions; test construction is correct and consistent with existing test patterns.
source/isaaclab_newton/setup.py	Adds explicit pyglet>=2.1.6,<3 dependency to the [all] extra, making the OpenGL viewer dependency explicit rather than relying on transitive installs.
source/isaaclab_visualizers/setup.py	Adds matching pyglet>=2.1.6,<3 dependency to the [newton] extra; version range is consistent with isaaclab_newton/setup.py.
source/isaaclab/isaaclab/cli/commands/install.py	Updates informational print message to list pyglet alongside the other newton extras; no functional change.
docs/source/overview/core-concepts/visualization.rst	Adds troubleshooting section for Newton Visualizer OpenGL context failures (glCreateShader errors), explaining causes and workarounds.

Sequence Diagram

sequenceDiagram
    participant C as Caller
    participant SC as SimulationContext.reset()
    participant PM as PhysicsManager
    participant VI as initialize_visualizers()
    participant VZ as Visualizer.reset()

    C->>SC: "reset(soft=False)"
    SC->>PM: reset(soft)
    Note over PM: PhysX tensor views created/ready
    alt _visualizers not empty
        SC->>VZ: viz.reset(soft) for each viz
    else _visualizers empty (first call)
        SC->>VI: initialize_visualizers()
        Note over VI: Visualizers access PhysX views safely
        VI-->>SC: _visualizers populated
    end
    SC->>PM: play()
    Note over PM: Timeline events pumped
    SC-->>C: "_is_playing=True, _is_stopped=False"

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