* Add about_Error_Handling and fix error terminology across docs

Create a comprehensive about_Error_Handling reference topic that documents
PowerShell's three error categories: non-terminating, statement-terminating,
and script-terminating errors. Correct false claims in about_CommonParameters
and about_Preference_Variables that state -ErrorAction and
$ErrorActionPreference have "no effect on terminating errors." Update
about_Try_Catch_Finally, about_Throw, about_Trap, and
everything-about-exceptions to use precise terminology consistent with
existing usage in about_Calculated_Properties, about_Pipeline_Chain_Operators,
and about_Pwsh.

Fixes #1583

* Address mklement0 review: fix error terminology precision

- -ErrorAction Stop promotes to script-terminating, not statement-terminating
- $ErrorActionPreference applies to both non-terminating and
  statement-terminating errors (unlike -ErrorAction parameter)
- $ErrorActionPreference = 'Ignore' is now accepted (remove outdated caveat)
- Native command non-zero exit emits non-terminating NativeCommandExitException

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Comprehensive accuracy overhaul: escalation semantics, asymmetry, parse errors

Major corrections verified against PowerShell engine source code:

- Fix: -ErrorAction Stop produces script-terminating errors, not
  statement-terminating. ActionPreferenceStopException sets
  SuppressPromptInInterpreter=true, causing call-stack unwinding.
  Fixed across all 4 affected files.

- Add: New "$ErrorActionPreference asymmetry" section in
  about_Error_Handling documenting that $ErrorActionPreference applies
  to BOTH non-terminating and statement-terminating errors, while
  -ErrorAction only affects non-terminating errors. Includes runnable
  demo and IMPORTANT callout for exceptions (SuppressPromptInInterpreter,
  PS classes, PipelineStoppedException).

- Add: Parse errors to script-terminating generators list (per
  mklement0 review comment).

- Fix: about_Preference_Variables Ignore bullet incorrectly stated
  "Ignore isn't a valid value for $ErrorActionPreference" — it is
  accepted (only Suspend is rejected per ExecutionContext.cs).

- Fix: NOTE block on ThrowTerminatingError now correctly explains
  that $ErrorActionPreference can suppress it via the engine's
  statement-level handler in MiscOps.CheckActionPreference.

- Fix: Summary table updated — -ErrorAction Stop moved from
  statement-terminating to script-terminating column, new row added
  for $ErrorActionPreference behavior per error type.

- Fix: everything-about-exceptions.md — three remaining instances of
  vague "terminating error" updated to "script-terminating error" for
  throw and -ErrorAction Stop contexts.

All claims verified with live PowerShell 7.x tests:
  1. -ErrorAction Stop: next statement in scriptblock does NOT run (script-terminating)
  2. Parse errors: caught as MethodInvocationException
  3. $ErrorActionPreference='Ignore': accepted without error
  4. $ErrorActionPreference='SilentlyContinue': suppresses ThrowTerminatingError
  5. -ErrorAction SilentlyContinue: does NOT suppress ThrowTerminatingError

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Address mklement0 feedback: throw suppression, Ignore/$Error, advanced escalation

Three corrections based on mklement0's review:

1. throw CAN be suppressed by $ErrorActionPreference when set to
   SilentlyContinue or Ignore. Removed the incorrect claim that throw
   is "always" script-terminating "regardless of $ErrorActionPreference".
   Also documented that -ErrorAction on advanced functions translates
   to a scope-local $ErrorActionPreference, so it suppresses throw too.

2. Added NOTE that $ErrorActionPreference = 'Ignore' still records
   terminating errors in $Error. Ignore only prevents $Error recording
   for non-terminating errors.

3. Escalation section now documents the advanced vs. non-advanced
   distinction: $ErrorActionPreference = 'Stop' produces
   script-terminating errors in non-advanced contexts, but
   statement-terminating errors in advanced contexts ([CmdletBinding()]).
   Summary table updated to reflect both contexts.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Refine escalation terminology: terminating (context-dependent) not script-terminating

Per mklement0 feedback, -ErrorAction Stop escalation scope depends on
whether the context is advanced ([CmdletBinding()]) or non-advanced.
Changed about_CommonParameters.md and ErrorAction table to say
"terminating error" generically, with escalation section providing
the full advanced vs. non-advanced explanation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Extend error handling accuracy to about_Throw, about_Try_Catch_Finally

- about_Throw: Add $ErrorActionPreference suppression caveat (throw CAN
  be suppressed by SilentlyContinue/Ignore), add NOTE block with Ignore
  still recording in $Error, update description to "by default"
- about_Try_Catch_Finally: Add NOTE about throw suppression with cross-ref
  to about_Error_Handling, fix $tempPath -> $tempFile code bug (line 264)
- about_Preference_Variables: Fix Ignore bullet - clarify that Ignore only
  prevents $Error recording for non-terminating errors, not terminating
- everything-about-exceptions: Change -ErrorAction Stop from
  "script-terminating" to "terminating" (context-dependent behavior)

All claims verified against live PowerShell 7.6 behavior.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Final polish: qualify Ignore/$Error claims and About.md index

- About.md: Update throw index to "script-terminating error by default"
- about_Automatic_Variables: Qualify $Error/Ignore as non-terminating only
- about_CommonParameters: Qualify Ignore bullet as non-terminating only

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Add about_Error_Handling to index; fix stale descriptions and dates

- About.md: Add missing about_Error_Handling entry to topic index
- About.md: Update about_Trap and about_Try_Catch_Finally descriptions
  to say "statement-terminating and script-terminating errors"
- about_Try_Catch_Finally.md: Fix [07] link text to match target heading
- Update ms.date on about_Trap, about_CommonParameters,
  about_Preference_Variables, everything-about-exceptions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Editorial changes - mostly formatting

* Copy changes to all versions

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Sean Wheeler <sean.wheeler@microsoft.com>