feat: add a "check internal tag" action to mesh-doctor

[bd713]

Description

This PR adds a new mesh-doctor action to verify that tagged 2D elements are internal (i.e., have exactly 2 volume neighbors):

• Identifies problematic cells with 0, 1, or 3+ neighbors
• Optional mesh output with faulty cells retagged to a null value
• Verbose mode for detailed connectivity diagnostics

Usage

mesh-doctor checkInternalTags -i mesh.vtu \
  --tagArray FaultMask \
  --tagValues 1 2 3 4 5 6 7 8 9 \
  --fixedOutput meshFixTag.vtu \
  --nullTagValue 9999

[jafranc]

why float ?

[bd713]

Just to be consistent with the original vtu which stores FaultMask as a float rather than a int.
But I agree all tags should be int.

[bd713]

The code is now handling all tags as int.

[jafranc]

is there any value at this point in ascii ?

[bd713]

was mimicking other action. Will force binary and change orphan2d as well.

[jafranc]

Suggested change

	# Collect bad elements
	for elem in elementsByNeighbors[ 0 ]:
	allBadElements.append( elem )
	for elem in elementsByNeighbors[ 1 ]:
	allBadElements.append( elem )
	for elem in elementsByNeighbors[ 'other' ]:
	allBadElements.append( elem )
	# Collect bad elements
	allBadElements.extend( elementsByNeighbors[0] )
	allBadElements.extend( elementsByNeighbors[1] )
	allBadElements.extend( elementsByNeighbors['other'] )

[bd713]

thanks, suggestion is now integrated